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</pre><pre class='rust '>
<span class='doccomment'>//! Ordered iterators.</span>
<span class='attribute'>#<span class='op'>!</span>[<span class='ident'>cfg_attr</span>(<span class='ident'>all</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"nightly"</span>, <span class='ident'>test</span>), <span class='ident'>feature</span>(<span class='ident'>test</span>))]</span>
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>bit_set</span>;
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>bit_vec</span>;
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>vec_map</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>::<span class='ident'>Ordering</span>::<span class='op'>*</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>iter</span>::<span class='ident'>Peekable</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>collections</span>::{
<span class='ident'>btree_map</span>, <span class='ident'>btree_set</span>,
};
<span class='doccomment'>/// Allows an iterator to do an inner join with another</span>
<span class='doccomment'>/// iterator to combine their values or filter based on their keys.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This trait is applied to an iterator over a map-like structure.</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>OrderedMapIterator</span>: <span class='ident'>Iterator</span><span class='op'><</span><span class='ident'>Item</span><span class='op'>=</span>(<span class='op'><</span><span class='kw'>Self</span> <span class='kw'>as</span> <span class='ident'>OrderedMapIterator</span><span class='op'>></span>::<span class='ident'>Key</span>, <span class='op'><</span><span class='kw'>Self</span> <span class='kw'>as</span> <span class='ident'>OrderedMapIterator</span><span class='op'>></span>::<span class='ident'>Val</span>)<span class='op'>></span> <span class='op'>+</span> <span class='ident'>Sized</span> {
<span class='kw'>type</span> <span class='ident'>Key</span>;
<span class='kw'>type</span> <span class='ident'>Val</span>;
<span class='doccomment'>/// Joins two ordered maps together.</span>
<span class='kw'>fn</span> <span class='ident'>inner_join_map</span><span class='op'><</span><span class='ident'>I</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>map</span>: <span class='ident'>I</span>) <span class='op'>-></span> <span class='ident'>InnerJoinMap</span><span class='op'><</span><span class='kw'>Self</span>, <span class='ident'>I</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>I</span>: <span class='ident'>OrderedMapIterator</span><span class='op'><</span><span class='ident'>Key</span><span class='op'>=</span><span class='ident'>Self</span>::<span class='ident'>Key</span><span class='op'>></span> {
<span class='ident'>InnerJoinMap</span> {
<span class='ident'>a</span>: <span class='self'>self</span>,
<span class='ident'>b</span>: <span class='ident'>map</span>
}
}
<span class='doccomment'>/// Filters an ordered map with an ordered set.</span>
<span class='kw'>fn</span> <span class='ident'>inner_join_set</span><span class='op'><</span><span class='ident'>I</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>set</span>: <span class='ident'>I</span>) <span class='op'>-></span> <span class='ident'>InnerJoinMapSet</span><span class='op'><</span><span class='kw'>Self</span>, <span class='ident'>I</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>I</span>: <span class='ident'>OrderedSetIterator</span><span class='op'><</span><span class='ident'>Item</span><span class='op'>=</span><span class='ident'>Self</span>::<span class='ident'>Key</span><span class='op'>></span> {
<span class='ident'>InnerJoinMapSet</span> {
<span class='ident'>map</span>: <span class='self'>self</span>,
<span class='ident'>set</span>: <span class='ident'>set</span>
}
}
<span class='doccomment'>/// Joins an ordered iterator with another ordered iterator.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// The new iterator will return a key-value pair for every key in</span>
<span class='doccomment'>/// either iterator. If a key is present in both iterators, they</span>
<span class='doccomment'>/// will be returned together (two values). If a value is in `other`</span>
<span class='doccomment'>/// but not `self`, it will be returned without the value in</span>
<span class='doccomment'>/// `self`. If the value is in `self` but not `other`,</span>
<span class='doccomment'>/// it will be returned without the value from `other`.</span>
<span class='kw'>fn</span> <span class='ident'>outer_join</span><span class='op'><</span><span class='ident'>I</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>other</span>: <span class='ident'>I</span>) <span class='op'>-></span> <span class='ident'>OuterJoin</span><span class='op'><</span><span class='kw'>Self</span>, <span class='ident'>I</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>I</span>: <span class='ident'>OrderedMapIterator</span><span class='op'><</span><span class='ident'>Key</span><span class='op'>=</span><span class='ident'>Self</span>::<span class='ident'>Key</span><span class='op'>></span> {
<span class='ident'>OuterJoin</span> {
<span class='ident'>left</span>: <span class='self'>self</span>.<span class='ident'>peekable</span>(),
<span class='ident'>right</span>: <span class='ident'>other</span>.<span class='ident'>peekable</span>()
}
}
}
<span class='doccomment'>/// Allows an iterator to do an inner join with another</span>
<span class='doccomment'>/// iterator to combine their values or filter based on their keys.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// This trait is applied to an iterator over a set-like structure.</span>
<span class='kw'>pub</span> <span class='kw'>trait</span> <span class='ident'>OrderedSetIterator</span>: <span class='ident'>Iterator</span> <span class='op'>+</span> <span class='ident'>Sized</span> {
<span class='doccomment'>/// Joins two ordered maps together.</span>
<span class='kw'>fn</span> <span class='ident'>inner_join_map</span><span class='op'><</span><span class='ident'>I</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>map</span>: <span class='ident'>I</span>) <span class='op'>-></span> <span class='ident'>InnerJoinMapSet</span><span class='op'><</span><span class='ident'>I</span>, <span class='kw'>Self</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>I</span>: <span class='ident'>OrderedMapIterator</span><span class='op'><</span><span class='ident'>Key</span><span class='op'>=</span><span class='ident'>Self</span>::<span class='ident'>Item</span><span class='op'>></span> {
<span class='ident'>InnerJoinMapSet</span> {
<span class='ident'>map</span>: <span class='ident'>map</span>,
<span class='ident'>set</span>: <span class='self'>self</span>
}
}
<span class='doccomment'>/// Filters an ordered map with an ordered set.</span>
<span class='kw'>fn</span> <span class='ident'>inner_join_set</span><span class='op'><</span><span class='ident'>I</span><span class='op'>></span>(<span class='self'>self</span>, <span class='ident'>map</span>: <span class='ident'>I</span>) <span class='op'>-></span> <span class='ident'>InnerJoinSet</span><span class='op'><</span><span class='kw'>Self</span>, <span class='ident'>I</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>I</span>: <span class='ident'>OrderedSetIterator</span><span class='op'><</span><span class='ident'>Item</span><span class='op'>=</span><span class='ident'>Self</span>::<span class='ident'>Item</span><span class='op'>></span> {
<span class='ident'>InnerJoinSet</span> {
<span class='ident'>a</span>: <span class='self'>self</span>,
<span class='ident'>b</span>: <span class='ident'>map</span>
}
}
}
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>InnerJoinMap</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> {<span class='ident'>a</span>: <span class='ident'>A</span>, <span class='ident'>b</span>: <span class='ident'>B</span>}
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>InnerJoinMapSet</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> {<span class='ident'>map</span>: <span class='ident'>A</span>, <span class='ident'>set</span>: <span class='ident'>B</span>}
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Clone</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>InnerJoinSet</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> {<span class='ident'>a</span>: <span class='ident'>A</span>, <span class='ident'>b</span>: <span class='ident'>B</span>}
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>OuterJoin</span><span class='op'><</span><span class='ident'>A</span>: <span class='ident'>Iterator</span>, <span class='ident'>B</span>: <span class='ident'>Iterator</span><span class='op'>></span> {
<span class='ident'>left</span>: <span class='ident'>Peekable</span><span class='op'><</span><span class='ident'>A</span><span class='op'>></span>,
<span class='ident'>right</span>: <span class='ident'>Peekable</span><span class='op'><</span><span class='ident'>B</span><span class='op'>></span>,
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>OuterJoin</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Iterator</span>, <span class='ident'>B</span>: <span class='ident'>Clone</span> <span class='op'>+</span> <span class='ident'>Iterator</span>, <span class='ident'>A</span>::<span class='ident'>Item</span>: <span class='ident'>Clone</span>, <span class='ident'>B</span>::<span class='ident'>Item</span>: <span class='ident'>Clone</span> {
<span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&</span><span class='self'>self</span>) <span class='op'>-></span> <span class='ident'>OuterJoin</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> {
<span class='ident'>OuterJoin</span> { <span class='ident'>left</span>: <span class='self'>self</span>.<span class='ident'>left</span>.<span class='ident'>clone</span>(), <span class='ident'>right</span>: <span class='self'>self</span>.<span class='ident'>right</span>.<span class='ident'>clone</span>() }
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>InnerJoinMap</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>OrderedMapIterator</span>,
<span class='ident'>B</span>: <span class='ident'>OrderedMapIterator</span><span class='op'><</span><span class='ident'>Key</span><span class='op'>=</span><span class='ident'>A</span>::<span class='ident'>Key</span><span class='op'>></span>,
<span class='ident'>A</span>::<span class='ident'>Key</span>: <span class='ident'>Ord</span>,
{
<span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> (<span class='ident'>A</span>::<span class='ident'>Key</span>, (<span class='ident'>A</span>::<span class='ident'>Val</span>, <span class='ident'>B</span>::<span class='ident'>Val</span>));
<span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span>(<span class='ident'>A</span>::<span class='ident'>Key</span>, (<span class='ident'>A</span>::<span class='ident'>Val</span>, <span class='ident'>B</span>::<span class='ident'>Val</span>))<span class='op'>></span> {
<span class='kw'>let</span> (<span class='kw-2'>mut</span> <span class='ident'>key_a</span>, <span class='kw-2'>mut</span> <span class='ident'>data_a</span>) <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>a</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>((<span class='ident'>key</span>, <span class='ident'>data</span>)) <span class='op'>=></span> (<span class='ident'>key</span>, <span class='ident'>data</span>)
};
<span class='kw'>let</span> (<span class='kw-2'>mut</span> <span class='ident'>key_b</span>, <span class='kw-2'>mut</span> <span class='ident'>data_b</span>) <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>b</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>((<span class='ident'>key</span>, <span class='ident'>data</span>)) <span class='op'>=></span> (<span class='ident'>key</span>, <span class='ident'>data</span>)
};
<span class='kw'>loop</span> {
<span class='kw'>match</span> <span class='ident'>key_a</span>.<span class='ident'>cmp</span>(<span class='kw-2'>&</span><span class='ident'>key_b</span>) {
<span class='ident'>Less</span> <span class='op'>=></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>a</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>((<span class='ident'>key</span>, <span class='ident'>data</span>)) <span class='op'>=></span> {
<span class='ident'>key_a</span> <span class='op'>=</span> <span class='ident'>key</span>;
<span class='ident'>data_a</span> <span class='op'>=</span> <span class='ident'>data</span>;
}
};
},
<span class='ident'>Equal</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Some</span>((<span class='ident'>key_a</span>, (<span class='ident'>data_a</span>, <span class='ident'>data_b</span>))),
<span class='ident'>Greater</span> <span class='op'>=></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>b</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>((<span class='ident'>key</span>, <span class='ident'>data</span>)) <span class='op'>=></span> {
<span class='ident'>key_b</span> <span class='op'>=</span> <span class='ident'>key</span>;
<span class='ident'>data_b</span> <span class='op'>=</span> <span class='ident'>data</span>;
}
};
}
}
}
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>InnerJoinSet</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>OrderedSetIterator</span>,
<span class='ident'>B</span>: <span class='ident'>OrderedSetIterator</span><span class='op'><</span><span class='ident'>Item</span><span class='op'>=</span><span class='ident'>A</span>::<span class='ident'>Item</span><span class='op'>></span>,
<span class='ident'>A</span>::<span class='ident'>Item</span>: <span class='ident'>Ord</span>,
{
<span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> <span class='ident'>A</span>::<span class='ident'>Item</span>;
<span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>A</span>::<span class='ident'>Item</span><span class='op'>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>key_a</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>a</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>(<span class='ident'>key</span>) <span class='op'>=></span> <span class='ident'>key</span>
};
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>key_b</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>b</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>(<span class='ident'>key</span>) <span class='op'>=></span> <span class='ident'>key</span>
};
<span class='kw'>loop</span> {
<span class='kw'>match</span> <span class='ident'>key_a</span>.<span class='ident'>cmp</span>(<span class='kw-2'>&</span><span class='ident'>key_b</span>) {
<span class='ident'>Less</span> <span class='op'>=></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>a</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>(<span class='ident'>key</span>) <span class='op'>=></span> { <span class='ident'>key_a</span> <span class='op'>=</span> <span class='ident'>key</span>; }
};
},
<span class='ident'>Equal</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Some</span>(<span class='ident'>key_a</span>),
<span class='ident'>Greater</span> <span class='op'>=></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>b</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>(<span class='ident'>key</span>) <span class='op'>=></span> { <span class='ident'>key_b</span> <span class='op'>=</span> <span class='ident'>key</span>; }
};
}
}
}
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>MapIter</span>, <span class='ident'>SetIter</span><span class='op'>></span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>InnerJoinMapSet</span><span class='op'><</span><span class='ident'>MapIter</span>, <span class='ident'>SetIter</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>SetIter</span>: <span class='ident'>OrderedSetIterator</span>,
<span class='ident'>MapIter</span>: <span class='ident'>OrderedMapIterator</span><span class='op'><</span><span class='ident'>Key</span><span class='op'>=</span><span class='ident'>SetIter</span>::<span class='ident'>Item</span><span class='op'>></span>,
<span class='ident'>MapIter</span>::<span class='ident'>Key</span>: <span class='ident'>Ord</span>,
{
<span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> (<span class='ident'>MapIter</span>::<span class='ident'>Key</span>, <span class='ident'>MapIter</span>::<span class='ident'>Val</span>);
<span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span>(<span class='ident'>MapIter</span>::<span class='ident'>Key</span>, <span class='ident'>MapIter</span>::<span class='ident'>Val</span>)<span class='op'>></span> {
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>key_set</span> <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>set</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>(<span class='ident'>key</span>) <span class='op'>=></span> <span class='ident'>key</span>
};
<span class='kw'>let</span> (<span class='kw-2'>mut</span> <span class='ident'>key_map</span>, <span class='kw-2'>mut</span> <span class='ident'>data</span>) <span class='op'>=</span> <span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>map</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>((<span class='ident'>key</span>, <span class='ident'>data</span>)) <span class='op'>=></span> (<span class='ident'>key</span>, <span class='ident'>data</span>)
};
<span class='kw'>loop</span> {
<span class='kw'>match</span> <span class='ident'>key_set</span>.<span class='ident'>cmp</span>(<span class='kw-2'>&</span><span class='ident'>key_map</span>) {
<span class='ident'>Less</span> <span class='op'>=></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>set</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>(<span class='ident'>key</span>) <span class='op'>=></span> { <span class='ident'>key_set</span> <span class='op'>=</span> <span class='ident'>key</span>; }
};
},
<span class='ident'>Equal</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>Some</span>((<span class='ident'>key_set</span>, <span class='ident'>data</span>)),
<span class='ident'>Greater</span> <span class='op'>=></span> {
<span class='kw'>match</span> <span class='self'>self</span>.<span class='ident'>map</span>.<span class='ident'>next</span>() {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>,
<span class='prelude-val'>Some</span>((<span class='ident'>key</span>, <span class='ident'>d</span>)) <span class='op'>=></span> {
<span class='ident'>key_map</span> <span class='op'>=</span> <span class='ident'>key</span>;
<span class='ident'>data</span> <span class='op'>=</span> <span class='ident'>d</span>;
}
};
}
}
}
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> <span class='ident'>Iterator</span> <span class='kw'>for</span> <span class='ident'>OuterJoin</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>OrderedMapIterator</span>,
<span class='ident'>B</span>: <span class='ident'>OrderedMapIterator</span><span class='op'><</span><span class='ident'>Key</span><span class='op'>=</span><span class='ident'>A</span>::<span class='ident'>Key</span><span class='op'>></span>,
<span class='ident'>A</span>::<span class='ident'>Key</span>: <span class='ident'>Ord</span> <span class='op'>+</span> <span class='ident'>Eq</span>,
{
<span class='kw'>type</span> <span class='ident'>Item</span> <span class='op'>=</span> (<span class='ident'>A</span>::<span class='ident'>Key</span>, (<span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>A</span>::<span class='ident'>Val</span><span class='op'>></span>, <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>B</span>::<span class='ident'>Val</span><span class='op'>></span>));
<span class='kw'>fn</span> <span class='ident'>next</span>(<span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>) <span class='op'>-></span> <span class='prelude-ty'>Option</span><span class='op'><</span>(<span class='ident'>A</span>::<span class='ident'>Key</span>, (<span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>A</span>::<span class='ident'>Val</span><span class='op'>></span>, <span class='prelude-ty'>Option</span><span class='op'><</span><span class='ident'>B</span>::<span class='ident'>Val</span><span class='op'>></span>))<span class='op'>></span> {
<span class='kw'>let</span> <span class='ident'>which</span> <span class='op'>=</span> <span class='kw'>match</span> (<span class='self'>self</span>.<span class='ident'>left</span>.<span class='ident'>peek</span>(), <span class='self'>self</span>.<span class='ident'>right</span>.<span class='ident'>peek</span>()) {
(<span class='prelude-val'>Some</span>(<span class='kw-2'>&</span>(<span class='kw-2'>ref</span> <span class='ident'>ka</span>, _)), <span class='prelude-val'>Some</span>(<span class='kw-2'>&</span>(<span class='kw-2'>ref</span> <span class='ident'>kb</span>, _))) <span class='op'>=></span> <span class='ident'>kb</span>.<span class='ident'>cmp</span>(<span class='ident'>ka</span>),
(<span class='prelude-val'>None</span>, <span class='prelude-val'>Some</span>(_)) <span class='op'>=></span> <span class='ident'>Less</span>,
(<span class='prelude-val'>Some</span>(_), <span class='prelude-val'>None</span>) <span class='op'>=></span> <span class='ident'>Greater</span>,
(<span class='prelude-val'>None</span>, <span class='prelude-val'>None</span>) <span class='op'>=></span> <span class='kw'>return</span> <span class='prelude-val'>None</span>
};
<span class='kw'>match</span> <span class='ident'>which</span> {
<span class='ident'>Equal</span> <span class='op'>=></span> {
<span class='kw'>let</span> ((<span class='ident'>k</span>, <span class='ident'>a</span>), (_, <span class='ident'>b</span>)) <span class='op'>=</span>
(<span class='self'>self</span>.<span class='ident'>left</span>.<span class='ident'>next</span>().<span class='ident'>expect</span>(<span class='string'>"no value found"</span>),
<span class='self'>self</span>.<span class='ident'>right</span>.<span class='ident'>next</span>().<span class='ident'>expect</span>(<span class='string'>"no value found"</span>));
<span class='prelude-val'>Some</span>((<span class='ident'>k</span>, (<span class='prelude-val'>Some</span>(<span class='ident'>a</span>), <span class='prelude-val'>Some</span>(<span class='ident'>b</span>))))
}
<span class='ident'>Less</span> <span class='op'>=></span> {
<span class='kw'>let</span> (<span class='ident'>k</span>, <span class='ident'>v</span>) <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>right</span>.<span class='ident'>next</span>().<span class='ident'>expect</span>(<span class='string'>"no value found"</span>);
<span class='prelude-val'>Some</span>((<span class='ident'>k</span>, (<span class='prelude-val'>None</span>, <span class='prelude-val'>Some</span>(<span class='ident'>v</span>))))
}
<span class='ident'>Greater</span> <span class='op'>=></span> {
<span class='kw'>let</span> (<span class='ident'>k</span>, <span class='ident'>v</span>) <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>left</span>.<span class='ident'>next</span>().<span class='ident'>expect</span>(<span class='string'>"no value found"</span>);
<span class='prelude-val'>Some</span>((<span class='ident'>k</span>, (<span class='prelude-val'>Some</span>(<span class='ident'>v</span>), <span class='prelude-val'>None</span>)))
}
}
}
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>K</span>: <span class='ident'>Ord</span><span class='op'>></span> <span class='ident'>OrderedSetIterator</span> <span class='kw'>for</span> <span class='ident'>btree_set</span>::<span class='ident'>Iter</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>K</span><span class='op'>></span> {}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>K</span>: <span class='ident'>Ord</span>, <span class='ident'>V</span><span class='op'>></span> <span class='ident'>OrderedMapIterator</span> <span class='kw'>for</span> <span class='ident'>btree_map</span>::<span class='ident'>Iter</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>K</span>, <span class='ident'>V</span><span class='op'>></span> {
<span class='kw'>type</span> <span class='ident'>Key</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>K</span>;
<span class='kw'>type</span> <span class='ident'>Val</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>V</span>;
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>K</span>: <span class='ident'>Ord</span>, <span class='ident'>V</span><span class='op'>></span> <span class='ident'>OrderedMapIterator</span> <span class='kw'>for</span> <span class='ident'>btree_map</span>::<span class='ident'>IntoIter</span><span class='op'><</span><span class='ident'>K</span>, <span class='ident'>V</span><span class='op'>></span> {
<span class='kw'>type</span> <span class='ident'>Key</span> <span class='op'>=</span> <span class='ident'>K</span>;
<span class='kw'>type</span> <span class='ident'>Val</span> <span class='op'>=</span> <span class='ident'>V</span>;
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>K</span>: <span class='ident'>Ord</span>, <span class='ident'>V</span><span class='op'>></span> <span class='ident'>OrderedMapIterator</span> <span class='kw'>for</span> <span class='ident'>btree_map</span>::<span class='ident'>IterMut</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>K</span>, <span class='ident'>V</span><span class='op'>></span> {
<span class='kw'>type</span> <span class='ident'>Key</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>K</span>;
<span class='kw'>type</span> <span class='ident'>Val</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='kw-2'>mut</span> <span class='ident'>V</span>;
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>K</span>: <span class='ident'>Ord</span>, <span class='ident'>V</span><span class='op'>></span> <span class='ident'>OrderedSetIterator</span> <span class='kw'>for</span> <span class='ident'>btree_map</span>::<span class='ident'>Keys</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>K</span>, <span class='ident'>V</span><span class='op'>></span> {}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>V</span><span class='op'>></span> <span class='ident'>OrderedMapIterator</span> <span class='kw'>for</span> <span class='ident'>vec_map</span>::<span class='ident'>Iter</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>V</span><span class='op'>></span> {
<span class='kw'>type</span> <span class='ident'>Key</span> <span class='op'>=</span> <span class='ident'>usize</span>;
<span class='kw'>type</span> <span class='ident'>Val</span> <span class='op'>=</span> <span class='kw-2'>&</span><span class='lifetime'>'a</span> <span class='ident'>V</span>;
}
<span class='kw'>impl</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>B</span>: <span class='ident'>bit_vec</span>::<span class='ident'>BitBlock</span><span class='op'>></span> <span class='ident'>OrderedSetIterator</span> <span class='kw'>for</span> <span class='ident'>bit_set</span>::<span class='ident'>Iter</span><span class='op'><</span><span class='lifetime'>'a</span>, <span class='ident'>B</span><span class='op'>></span> {}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> <span class='ident'>OrderedMapIterator</span> <span class='kw'>for</span> <span class='ident'>InnerJoinMap</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>OrderedMapIterator</span>,
<span class='ident'>B</span>: <span class='ident'>OrderedMapIterator</span><span class='op'><</span><span class='ident'>Key</span><span class='op'>=</span><span class='ident'>A</span>::<span class='ident'>Key</span><span class='op'>></span>,
<span class='ident'>A</span>::<span class='ident'>Key</span>: <span class='ident'>Ord</span>,
{
<span class='kw'>type</span> <span class='ident'>Key</span> <span class='op'>=</span> <span class='ident'>A</span>::<span class='ident'>Key</span>;
<span class='kw'>type</span> <span class='ident'>Val</span> <span class='op'>=</span> (<span class='ident'>A</span>::<span class='ident'>Val</span>, <span class='ident'>B</span>::<span class='ident'>Val</span>);
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> <span class='ident'>OrderedMapIterator</span> <span class='kw'>for</span> <span class='ident'>InnerJoinMapSet</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>OrderedMapIterator</span>,
<span class='ident'>B</span>: <span class='ident'>OrderedSetIterator</span><span class='op'><</span><span class='ident'>Item</span><span class='op'>=</span><span class='ident'>A</span>::<span class='ident'>Key</span><span class='op'>></span>,
<span class='ident'>A</span>::<span class='ident'>Key</span>: <span class='ident'>Ord</span>,
{
<span class='kw'>type</span> <span class='ident'>Key</span> <span class='op'>=</span> <span class='ident'>A</span>::<span class='ident'>Key</span>;
<span class='kw'>type</span> <span class='ident'>Val</span> <span class='op'>=</span> <span class='ident'>A</span>::<span class='ident'>Val</span>;
}
<span class='kw'>impl</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span> <span class='ident'>OrderedSetIterator</span> <span class='kw'>for</span> <span class='ident'>InnerJoinSet</span><span class='op'><</span><span class='ident'>A</span>, <span class='ident'>B</span><span class='op'>></span>
<span class='kw'>where</span> <span class='ident'>A</span>: <span class='ident'>OrderedSetIterator</span>,
<span class='ident'>B</span>: <span class='ident'>OrderedSetIterator</span><span class='op'><</span><span class='ident'>Item</span><span class='op'>=</span><span class='ident'>A</span>::<span class='ident'>Item</span><span class='op'>></span>,
<span class='ident'>A</span>::<span class='ident'>Item</span>: <span class='ident'>Ord</span>,
{}
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>tests</span> {
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>all</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"nightly"</span>, <span class='ident'>test</span>))]</span>
<span class='kw'>extern</span> <span class='kw'>crate</span> <span class='ident'>test</span>;
<span class='kw'>use</span> <span class='ident'>super</span>::{<span class='ident'>OrderedSetIterator</span>, <span class='ident'>OrderedMapIterator</span>};
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>join_two_sets</span>() {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>collections</span>::<span class='ident'>BTreeSet</span>;
<span class='kw'>let</span> <span class='ident'>powers_of_two</span>: <span class='ident'>BTreeSet</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>10</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>2</span>).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='ident'>powers_of_three</span>: <span class='ident'>BTreeSet</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>10</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>3</span>).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>6</span>, <span class='number'>12</span>, <span class='number'>18</span>];
<span class='kw'>let</span> <span class='ident'>powers_of_two_and_three</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span>
<span class='ident'>powers_of_two</span>.<span class='ident'>iter</span>()
.<span class='ident'>inner_join_set</span>(<span class='ident'>powers_of_three</span>.<span class='ident'>iter</span>())
.<span class='ident'>map</span>(<span class='op'>|</span><span class='kw-2'>&</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span>)
.<span class='ident'>collect</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>expected</span>, <span class='ident'>powers_of_two_and_three</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>join_three_sets</span>() {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>collections</span>::<span class='ident'>BTreeSet</span>;
<span class='kw'>let</span> <span class='ident'>powers_of_two</span>: <span class='ident'>BTreeSet</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>100</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>2</span>).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='ident'>powers_of_three</span>: <span class='ident'>BTreeSet</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>100</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>3</span>).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='ident'>powers_of_five</span>: <span class='ident'>BTreeSet</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>100</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>5</span>).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='ident'>expected</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>30</span>, <span class='number'>60</span>, <span class='number'>90</span>, <span class='number'>120</span>, <span class='number'>150</span>, <span class='number'>180</span>];
<span class='kw'>let</span> <span class='ident'>powers_of_two_and_three</span>: <span class='ident'>Vec</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span>
<span class='ident'>powers_of_two</span>.<span class='ident'>iter</span>()
.<span class='ident'>inner_join_set</span>(<span class='ident'>powers_of_three</span>.<span class='ident'>iter</span>())
.<span class='ident'>inner_join_set</span>(<span class='ident'>powers_of_five</span>.<span class='ident'>iter</span>())
.<span class='ident'>map</span>(<span class='op'>|</span><span class='kw-2'>&</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span>)
.<span class='ident'>collect</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>expected</span>, <span class='ident'>powers_of_two_and_three</span>);
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>join_two_maps</span>() {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>collections</span>::<span class='ident'>BTreeMap</span>;
<span class='kw'>let</span> <span class='ident'>powers_of_two</span>: <span class='ident'>BTreeMap</span><span class='op'><</span><span class='ident'>i32</span>, <span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>10</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> (<span class='ident'>x</span> <span class='op'>*</span> <span class='number'>2</span>, <span class='ident'>x</span>)).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='ident'>powers_of_three</span>: <span class='ident'>BTreeMap</span><span class='op'><</span><span class='ident'>i32</span>, <span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>10</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> (<span class='ident'>x</span> <span class='op'>*</span> <span class='number'>3</span>, <span class='ident'>x</span>)).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>powers_of_two_and_three</span> <span class='op'>=</span>
<span class='ident'>powers_of_two</span>.<span class='ident'>iter</span>().<span class='ident'>inner_join_map</span>(<span class='ident'>powers_of_three</span>.<span class='ident'>iter</span>())
.<span class='ident'>map</span>(<span class='op'>|</span>(<span class='kw-2'>&</span><span class='ident'>k</span>, (<span class='kw-2'>&</span><span class='ident'>a</span>, <span class='kw-2'>&</span><span class='ident'>b</span>))<span class='op'>|</span> (<span class='ident'>k</span>, <span class='ident'>a</span>, <span class='ident'>b</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>6</span>, <span class='number'>3</span>, <span class='number'>2</span>)), <span class='ident'>powers_of_two_and_three</span>.<span class='ident'>next</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>12</span>, <span class='number'>6</span>, <span class='number'>4</span>)), <span class='ident'>powers_of_two_and_three</span>.<span class='ident'>next</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>18</span>, <span class='number'>9</span>, <span class='number'>6</span>)), <span class='ident'>powers_of_two_and_three</span>.<span class='ident'>next</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>powers_of_two_and_three</span>.<span class='ident'>next</span>());
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>join_two_maps_to_set</span>() {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>collections</span>::{<span class='ident'>BTreeMap</span>, <span class='ident'>BTreeSet</span>};
<span class='kw'>let</span> <span class='ident'>powers_of_two</span>: <span class='ident'>BTreeSet</span><span class='op'><</span><span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>10</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>2</span>).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='ident'>powers_of_three</span>: <span class='ident'>BTreeMap</span><span class='op'><</span><span class='ident'>i32</span>, <span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>10</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> (<span class='ident'>x</span> <span class='op'>*</span> <span class='number'>3</span>, <span class='ident'>x</span>)).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>powers_of_two_and_three</span> <span class='op'>=</span>
<span class='ident'>powers_of_two</span>.<span class='ident'>iter</span>().<span class='ident'>inner_join_map</span>(<span class='ident'>powers_of_three</span>.<span class='ident'>iter</span>())
.<span class='ident'>map</span>(<span class='op'>|</span>(<span class='kw-2'>&</span><span class='ident'>k</span>, <span class='kw-2'>&</span><span class='ident'>a</span>)<span class='op'>|</span> (<span class='ident'>k</span>, <span class='ident'>a</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>6</span>, <span class='number'>2</span>)), <span class='ident'>powers_of_two_and_three</span>.<span class='ident'>next</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>12</span>, <span class='number'>4</span>)), <span class='ident'>powers_of_two_and_three</span>.<span class='ident'>next</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>Some</span>((<span class='number'>18</span>, <span class='number'>6</span>)), <span class='ident'>powers_of_two_and_three</span>.<span class='ident'>next</span>());
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='prelude-val'>None</span>, <span class='ident'>powers_of_two_and_three</span>.<span class='ident'>next</span>());
}
<span class='attribute'>#[<span class='ident'>test</span>]</span>
<span class='kw'>fn</span> <span class='ident'>outer_join_fizz_buzz</span>() {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>collections</span>::<span class='ident'>BTreeMap</span>;
<span class='kw'>let</span> <span class='ident'>mul_of_three</span>: <span class='ident'>BTreeMap</span><span class='op'><</span><span class='ident'>i32</span>, <span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>0</span>..<span class='number'>100</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> (<span class='ident'>x</span><span class='op'>*</span><span class='number'>3</span>, <span class='ident'>x</span>)).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='ident'>mul_of_five</span>: <span class='ident'>BTreeMap</span><span class='op'><</span><span class='ident'>i32</span>, <span class='ident'>i32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>0</span>..<span class='number'>100</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> (<span class='ident'>x</span><span class='op'>*</span><span class='number'>5</span>, <span class='ident'>x</span>)).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>fizz_buzz</span> <span class='op'>=</span> <span class='ident'>BTreeMap</span>::<span class='ident'>new</span>();
<span class='kw'>for</span> (<span class='ident'>key</span>, (<span class='ident'>three</span>, <span class='ident'>five</span>)) <span class='kw'>in</span> <span class='ident'>mul_of_three</span>.<span class='ident'>iter</span>()
.<span class='ident'>outer_join</span>(<span class='ident'>mul_of_five</span>.<span class='ident'>iter</span>()) {
<span class='ident'>fizz_buzz</span>.<span class='ident'>insert</span>(<span class='ident'>key</span>, (<span class='ident'>three</span>.<span class='ident'>is_some</span>(), <span class='ident'>five</span>.<span class='ident'>is_some</span>()));
}
<span class='kw'>let</span> <span class='ident'>res</span>: <span class='ident'>BTreeMap</span><span class='op'><</span><span class='ident'>i32</span>, <span class='ident'>String</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>100</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>i</span><span class='op'>|</span>
(<span class='ident'>i</span>, <span class='kw'>match</span> <span class='ident'>fizz_buzz</span>.<span class='ident'>get</span>(<span class='kw-2'>&</span><span class='ident'>i</span>) {
<span class='prelude-val'>None</span> <span class='op'>=></span> <span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='ident'>i</span>),
<span class='prelude-val'>Some</span>(<span class='kw-2'>&</span>(<span class='boolval'>true</span>, <span class='boolval'>false</span>)) <span class='op'>=></span> <span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"Fizz"</span>),
<span class='prelude-val'>Some</span>(<span class='kw-2'>&</span>(<span class='boolval'>false</span>, <span class='boolval'>true</span>)) <span class='op'>=></span> <span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"Buzz"</span>),
<span class='prelude-val'>Some</span>(<span class='kw-2'>&</span>(<span class='boolval'>true</span>, <span class='boolval'>true</span>)) <span class='op'>=></span> <span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"FizzBuzz"</span>),
<span class='prelude-val'>Some</span>(<span class='kw-2'>&</span>(<span class='boolval'>false</span>, <span class='boolval'>false</span>)) <span class='op'>=></span> <span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>"Outer join failed..."</span>)
})).<span class='ident'>collect</span>();
<span class='kw'>for</span> <span class='ident'>i</span> <span class='kw'>in</span> <span class='number'>1</span>..<span class='number'>100</span> {
<span class='kw'>match</span> (<span class='ident'>i</span> <span class='op'>%</span> <span class='number'>3</span>, <span class='ident'>i</span> <span class='op'>%</span> <span class='number'>5</span>) {
(<span class='number'>0</span>, <span class='number'>0</span>) <span class='op'>=></span> <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"FizzBuzz"</span>, <span class='ident'>res</span>[<span class='kw-2'>&</span><span class='ident'>i</span>]),
(<span class='number'>0</span>, _) <span class='op'>=></span> <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"Fizz"</span>, <span class='ident'>res</span>[<span class='kw-2'>&</span><span class='ident'>i</span>]),
(_, <span class='number'>0</span>) <span class='op'>=></span> <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='string'>"Buzz"</span>, <span class='ident'>res</span>[<span class='kw-2'>&</span><span class='ident'>i</span>]),
_ <span class='op'>=></span> <span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='macro'>format</span><span class='macro'>!</span>(<span class='string'>"{}"</span>, <span class='ident'>i</span>), <span class='ident'>res</span>[<span class='kw-2'>&</span><span class='ident'>i</span>])
}
}
}
<span class='attribute'>#[<span class='ident'>bench</span>]</span>
<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>all</span>(<span class='ident'>feature</span> <span class='op'>=</span> <span class='string'>"nightly"</span>, <span class='ident'>test</span>))]</span>
<span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>inner_join_map</span>(<span class='ident'>b</span>: <span class='kw-2'>&</span><span class='kw-2'>mut</span> <span class='self'>self</span>::<span class='ident'>test</span>::<span class='ident'>Bencher</span>) {
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>collections</span>::<span class='ident'>BTreeSet</span>;
<span class='kw'>let</span> <span class='ident'>powers_of_two</span>: <span class='ident'>BTreeSet</span><span class='op'><</span><span class='ident'>u32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>1000000</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>2</span>).<span class='ident'>collect</span>();
<span class='kw'>let</span> <span class='ident'>powers_of_three</span>: <span class='ident'>BTreeSet</span><span class='op'><</span><span class='ident'>u32</span><span class='op'>></span> <span class='op'>=</span> (<span class='number'>1</span>..<span class='number'>1000000</span>).<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</span> <span class='op'>*</span> <span class='number'>3</span>).<span class='ident'>collect</span>();
<span class='ident'>b</span>.<span class='ident'>iter</span>(<span class='op'>||</span>{
<span class='kw'>for</span> <span class='ident'>x</span> <span class='kw'>in</span> <span class='ident'>powers_of_two</span>.<span class='ident'>iter</span>()
.<span class='ident'>inner_join_set</span>(<span class='ident'>powers_of_three</span>.<span class='ident'>iter</span>()) {
<span class='ident'>test</span>::<span class='ident'>black_box</span>(<span class='ident'>x</span>);
}
})
}
}
</pre>
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