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</pre><pre class="rust">
<span class="comment">// Copyright (c) 2017 Gilad Naaman</span>
<span class="comment">//</span>
<span class="comment">// Permission is hereby granted, free of charge, to any person obtaining a copy</span>
<span class="comment">// of this software and associated documentation files (the "Software"), to deal</span>
<span class="comment">// in the Software without restriction, including without limitation the rights</span>
<span class="comment">// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell</span>
<span class="comment">// copies of the Software, and to permit persons to whom the Software is</span>
<span class="comment">// furnished to do so, subject to the following conditions:</span>
<span class="comment">//</span>
<span class="comment">// The above copyright notice and this permission notice shall be included in all</span>
<span class="comment">// copies or substantial portions of the Software.</span>
<span class="comment">//</span>
<span class="comment">// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR</span>
<span class="comment">// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span>
<span class="comment">// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span>
<span class="comment">// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span>
<span class="comment">// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,</span>
<span class="comment">// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE</span>
<span class="comment">// SOFTWARE.</span>
<span class="doccomment">/// Reexport for `local_inner_macros`; see</span>
<span class="doccomment">/// <https://doc.rust-lang.org/edition-guide/rust-2018/macros/macro-changes.html#macros-using-local_inner_macros>.</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="attribute">#[<span class="ident">macro_export</span>]</span>
<span class="macro">macro_rules!</span> <span class="ident">_memoffset__compile_error</span> {
($(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">inner</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">compile_error!</span> { $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">inner</span>)<span class="op">*</span> }
}
}
<span class="doccomment">/// Produces a range instance representing the sub-slice containing the specified member.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This macro provides 2 forms of differing functionalities.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The first form is identical to the appearance of the `offset_of!` macro.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```ignore</span>
<span class="doccomment">/// span_of!(Struct, member)</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The second form of `span_of!` returns a sub-slice which starts at one field, and ends at another.</span>
<span class="doccomment">/// The general pattern of this form is:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```ignore</span>
<span class="doccomment">/// // Exclusive</span>
<span class="doccomment">/// span_of!(Struct, member_a .. member_b)</span>
<span class="doccomment">/// // Inclusive</span>
<span class="doccomment">/// span_of!(Struct, member_a ..= member_b)</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Open-ended ranges</span>
<span class="doccomment">/// span_of!(Struct, .. end)</span>
<span class="doccomment">/// span_of!(Struct, start ..)</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// *Note*:</span>
<span class="doccomment">/// This macro uses recursion in order to resolve the range expressions, so there is a limit to</span>
<span class="doccomment">/// the complexity of the expression.</span>
<span class="doccomment">/// In order to raise the limit, the compiler's recursion limit should be lifted.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ## Examples</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #[macro_use]</span>
<span class="doccomment">/// extern crate memoffset;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// #[repr(C)]</span>
<span class="doccomment">/// struct Florp {</span>
<span class="doccomment">/// a: u32</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// #[repr(C)]</span>
<span class="doccomment">/// struct Blarg {</span>
<span class="doccomment">/// x: [u32; 2],</span>
<span class="doccomment">/// y: [u8; 56],</span>
<span class="doccomment">/// z: Florp,</span>
<span class="doccomment">/// egg: [[u8; 4]; 4]</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() {</span>
<span class="doccomment">/// assert_eq!(0..84, span_of!(Blarg, ..));</span>
<span class="doccomment">/// assert_eq!(0..8, span_of!(Blarg, .. y));</span>
<span class="doccomment">/// assert_eq!(0..64, span_of!(Blarg, ..= y));</span>
<span class="doccomment">/// assert_eq!(0..8, span_of!(Blarg, x));</span>
<span class="doccomment">/// assert_eq!(8..84, span_of!(Blarg, y ..));</span>
<span class="doccomment">/// assert_eq!(0..8, span_of!(Blarg, x .. y));</span>
<span class="doccomment">/// assert_eq!(0..64, span_of!(Blarg, x ..= y));</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">macro_export</span>(<span class="ident">local_inner_macros</span>)]</span>
<span class="macro">macro_rules!</span> <span class="ident">span_of</span> {
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, [] ..<span class="op">=</span>) <span class="op">=</span><span class="op">></span> {
<span class="macro">_memoffset__compile_error!</span>(<span class="string">"Expected a range, found '..='"</span>)
};
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, [] ..) <span class="op">=</span><span class="op">></span> {
<span class="macro">_memoffset__compile_error!</span>(<span class="string">"Expected a range, found '..'"</span>)
};
<span class="comment">// No explicit begin for range.</span>
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">path</span>, [] ..) <span class="op">=</span><span class="op">></span> {{
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span> <span class="kw">as</span> <span class="ident">usize</span>,
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::__priv::size_of_pointee</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>))
}};
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">path</span>, [] ..<span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span>:<span class="ident">tt</span>) <span class="op">=</span><span class="op">></span> {{
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="macro">raw_field!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span>);
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="ident">end</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::__priv::size_of_pointee</span>(<span class="ident">end</span>))
}};
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">path</span>, [] .. <span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span>:<span class="ident">tt</span>) <span class="op">=</span><span class="op">></span> {{
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="macro">raw_field!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span>) <span class="kw">as</span> <span class="ident">usize</span>)
}};
<span class="comment">// Explicit begin and end for range.</span>
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">path</span>, # <span class="macro-nonterminal">$</span><span class="macro-nonterminal">begin</span>:<span class="ident">tt</span> [] ..<span class="op">=</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span>:<span class="ident">tt</span>) <span class="op">=</span><span class="op">></span> {{
<span class="kw">let</span> <span class="ident">begin</span> <span class="op">=</span> <span class="macro">raw_field!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">begin</span>);
<span class="kw">let</span> <span class="ident">end</span> <span class="op">=</span> <span class="macro">raw_field!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span>);
(<span class="ident">begin</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="ident">end</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::__priv::size_of_pointee</span>(<span class="ident">end</span>))
}};
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">path</span>, # <span class="macro-nonterminal">$</span><span class="macro-nonterminal">begin</span>:<span class="ident">tt</span> [] .. <span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span>:<span class="ident">tt</span>) <span class="op">=</span><span class="op">></span> {{
(<span class="macro">raw_field!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">begin</span>) <span class="kw">as</span> <span class="ident">usize</span>,
<span class="macro">raw_field!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">end</span>) <span class="kw">as</span> <span class="ident">usize</span>)
}};
<span class="comment">// No explicit end for range.</span>
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">path</span>, # <span class="macro-nonterminal">$</span><span class="macro-nonterminal">begin</span>:<span class="ident">tt</span> [] ..) <span class="op">=</span><span class="op">></span> {{
(<span class="macro">raw_field!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">begin</span>) <span class="kw">as</span> <span class="ident">usize</span>,
<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::__priv::size_of_pointee</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>))
}};
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">path</span>, # <span class="macro-nonterminal">$</span><span class="macro-nonterminal">begin</span>:<span class="ident">tt</span> [] ..<span class="op">=</span>) <span class="op">=</span><span class="op">></span> {{
<span class="macro">_memoffset__compile_error!</span>(
<span class="string">"Found inclusive range to the end of a struct. Did you mean '..' instead of '..='?"</span>)
}};
<span class="comment">// Just one field.</span>
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">path</span>, # <span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>:<span class="ident">tt</span> []) <span class="op">=</span><span class="op">></span> {{
<span class="kw">let</span> <span class="ident">field</span> <span class="op">=</span> <span class="macro">raw_field!</span>(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">field</span>);
(<span class="ident">field</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="ident">field</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">+</span> <span class="macro-nonterminal">$</span><span class="kw">crate</span><span class="macro-nonterminal">::__priv::size_of_pointee</span>(<span class="ident">field</span>))
}};
<span class="comment">// Parsing.</span>
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">path</span>, $(# <span class="macro-nonterminal">$</span><span class="macro-nonterminal">begin</span>:<span class="ident">tt</span>)<span class="op">+</span> [] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {{
<span class="macro">span_of!</span>(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>, $(#<span class="macro-nonterminal">$</span><span class="macro-nonterminal">begin</span>)<span class="op">*</span> #<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span> [] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="kw-2">*</span>)
}};
(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>:<span class="ident">ident</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>:<span class="ident">path</span>, [] <span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span>:<span class="ident">tt</span> $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>:<span class="ident">tt</span>)<span class="kw-2">*</span>) <span class="op">=</span><span class="op">></span> {{
<span class="macro">span_of!</span>(@<span class="ident">helper</span> <span class="macro-nonterminal">$</span><span class="macro-nonterminal">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">parent</span>, #<span class="macro-nonterminal">$</span><span class="macro-nonterminal">tt</span> [] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">rest</span>)<span class="kw-2">*</span>)
}};
<span class="comment">// Entry point.</span>
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">sty</span>:<span class="ident">path</span>, $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exp</span>:<span class="ident">tt</span>)<span class="op">+</span>) <span class="op">=</span><span class="op">></span> ({
<span class="comment">// Get a base pointer.</span>
<span class="macro">_memoffset__let_base_ptr!</span>(<span class="ident">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">sty</span>);
<span class="kw">let</span> <span class="ident">base</span> <span class="op">=</span> <span class="ident">root</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">let</span> (<span class="ident">begin</span>, <span class="ident">end</span>) <span class="op">=</span> <span class="macro">span_of!</span>(@<span class="ident">helper</span> <span class="ident">root</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">sty</span>, [] $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">exp</span>)<span class="kw-2">*</span>);
<span class="ident">begin</span><span class="op">-</span><span class="ident">base</span>..<span class="ident">end</span><span class="op">-</span><span class="ident">base</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="kw">use</span> <span class="ident">core::mem</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">span_simple</span>() {
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="kw">struct</span> <span class="ident">Foo</span> {
<span class="ident">a</span>: <span class="ident">u32</span>,
<span class="ident">b</span>: [<span class="ident">u8</span>; <span class="number">2</span>],
<span class="ident">c</span>: <span class="ident">i64</span>,
}
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Foo</span>, <span class="ident">a</span>), <span class="number">0</span>..<span class="number">4</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Foo</span>, <span class="ident">b</span>), <span class="number">4</span>..<span class="number">6</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Foo</span>, <span class="ident">c</span>), <span class="number">8</span>..<span class="number">8</span> <span class="op">+</span> <span class="number">8</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">miri</span>, <span class="ident">ignore</span>)]</span> <span class="comment">// this creates unaligned references</span>
<span class="kw">fn</span> <span class="ident">span_simple_packed</span>() {
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>, <span class="ident">packed</span>)]</span>
<span class="kw">struct</span> <span class="ident">Foo</span> {
<span class="ident">a</span>: <span class="ident">u32</span>,
<span class="ident">b</span>: [<span class="ident">u8</span>; <span class="number">2</span>],
<span class="ident">c</span>: <span class="ident">i64</span>,
}
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Foo</span>, <span class="ident">a</span>), <span class="number">0</span>..<span class="number">4</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Foo</span>, <span class="ident">b</span>), <span class="number">4</span>..<span class="number">6</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Foo</span>, <span class="ident">c</span>), <span class="number">6</span>..<span class="number">6</span> <span class="op">+</span> <span class="number">8</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">span_forms</span>() {
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="kw">struct</span> <span class="ident">Florp</span> {
<span class="ident">a</span>: <span class="ident">u32</span>,
}
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="kw">struct</span> <span class="ident">Blarg</span> {
<span class="ident">x</span>: <span class="ident">u64</span>,
<span class="ident">y</span>: [<span class="ident">u8</span>; <span class="number">56</span>],
<span class="ident">z</span>: <span class="ident">Florp</span>,
<span class="ident">egg</span>: [[<span class="ident">u8</span>; <span class="number">4</span>]; <span class="number">5</span>],
}
<span class="comment">// Love me some brute force</span>
<span class="macro">assert_eq!</span>(<span class="number">0</span>..<span class="number">8</span>, <span class="macro">span_of!</span>(<span class="ident">Blarg</span>, <span class="ident">x</span>));
<span class="macro">assert_eq!</span>(<span class="number">64</span>..<span class="number">68</span>, <span class="macro">span_of!</span>(<span class="ident">Blarg</span>, <span class="ident">z</span>));
<span class="macro">assert_eq!</span>(<span class="number">68</span>..<span class="ident">mem::size_of</span>::<span class="op"><</span><span class="ident">Blarg</span><span class="op">></span>(), <span class="macro">span_of!</span>(<span class="ident">Blarg</span>, <span class="ident">egg</span>));
<span class="macro">assert_eq!</span>(<span class="number">8</span>..<span class="number">64</span>, <span class="macro">span_of!</span>(<span class="ident">Blarg</span>, <span class="ident">y</span>..<span class="ident">z</span>));
<span class="macro">assert_eq!</span>(<span class="number">0</span>..<span class="number">64</span>, <span class="macro">span_of!</span>(<span class="ident">Blarg</span>, <span class="ident">x</span>..<span class="op">=</span><span class="ident">y</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">ig_test</span>() {
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="kw">struct</span> <span class="ident">Member</span> {
<span class="ident">foo</span>: <span class="ident">u32</span>,
}
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">C</span>)]</span>
<span class="kw">struct</span> <span class="ident">Test</span> {
<span class="ident">x</span>: <span class="ident">u64</span>,
<span class="ident">y</span>: [<span class="ident">u8</span>; <span class="number">56</span>],
<span class="ident">z</span>: <span class="ident">Member</span>,
<span class="ident">egg</span>: [[<span class="ident">u8</span>; <span class="number">4</span>]; <span class="number">4</span>],
}
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Test</span>, ..<span class="ident">x</span>), <span class="number">0</span>..<span class="number">0</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Test</span>, ..<span class="op">=</span><span class="ident">x</span>), <span class="number">0</span>..<span class="number">8</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Test</span>, ..<span class="ident">y</span>), <span class="number">0</span>..<span class="number">8</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Test</span>, ..<span class="op">=</span><span class="ident">y</span>), <span class="number">0</span>..<span class="number">64</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Test</span>, ..<span class="ident">z</span>), <span class="number">0</span>..<span class="number">64</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Test</span>, ..<span class="op">=</span><span class="ident">z</span>), <span class="number">0</span>..<span class="number">68</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Test</span>, ..<span class="ident">egg</span>), <span class="number">0</span>..<span class="number">68</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Test</span>, ..<span class="op">=</span><span class="ident">egg</span>), <span class="number">0</span>..<span class="number">84</span>);
<span class="macro">assert_eq!</span>(<span class="macro">span_of!</span>(<span class="ident">Test</span>, ..), <span class="number">0</span>..<span class="ident">mem::size_of</span>::<span class="op"><</span><span class="ident">Test</span><span class="op">></span>());
<span class="macro">assert_eq!</span>(
<span class="macro">span_of!</span>(<span class="ident">Test</span>, <span class="ident">x</span>..),
<span class="macro">offset_of!</span>(<span class="ident">Test</span>, <span class="ident">x</span>)..<span class="ident">mem::size_of</span>::<span class="op"><</span><span class="ident">Test</span><span class="op">></span>()
);
<span class="macro">assert_eq!</span>(
<span class="macro">span_of!</span>(<span class="ident">Test</span>, <span class="ident">y</span>..),
<span class="macro">offset_of!</span>(<span class="ident">Test</span>, <span class="ident">y</span>)..<span class="ident">mem::size_of</span>::<span class="op"><</span><span class="ident">Test</span><span class="op">></span>()
);
<span class="macro">assert_eq!</span>(
<span class="macro">span_of!</span>(<span class="ident">Test</span>, <span class="ident">z</span>..),
<span class="macro">offset_of!</span>(<span class="ident">Test</span>, <span class="ident">z</span>)..<span class="ident">mem::size_of</span>::<span class="op"><</span><span class="ident">Test</span><span class="op">></span>()
);
<span class="macro">assert_eq!</span>(
<span class="macro">span_of!</span>(<span class="ident">Test</span>, <span class="ident">egg</span>..),
<span class="macro">offset_of!</span>(<span class="ident">Test</span>, <span class="ident">egg</span>)..<span class="ident">mem::size_of</span>::<span class="op"><</span><span class="ident">Test</span><span class="op">></span>()
);
<span class="macro">assert_eq!</span>(
<span class="macro">span_of!</span>(<span class="ident">Test</span>, <span class="ident">x</span>..<span class="ident">y</span>),
<span class="macro">offset_of!</span>(<span class="ident">Test</span>, <span class="ident">x</span>)..<span class="macro">offset_of!</span>(<span class="ident">Test</span>, <span class="ident">y</span>)
);
<span class="macro">assert_eq!</span>(
<span class="macro">span_of!</span>(<span class="ident">Test</span>, <span class="ident">x</span>..<span class="op">=</span><span class="ident">y</span>),
<span class="macro">offset_of!</span>(<span class="ident">Test</span>, <span class="ident">x</span>)..<span class="macro">offset_of!</span>(<span class="ident">Test</span>, <span class="ident">y</span>) <span class="op">+</span> <span class="ident">mem::size_of</span>::<span class="op"><</span>[<span class="ident">u8</span>; <span class="number">56</span>]<span class="op">></span>()
);
}
}
</pre></div>
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