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</pre><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::Complex;
<span class="kw">use </span>num_traits::{AsPrimitive, FromPrimitive, Num, NumCast, ToPrimitive};
<span class="macro">macro_rules! </span>impl_to_primitive {
(<span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$to</span>:ident) => {
<span class="attr">#[inline]
</span><span class="kw">fn </span><span class="macro-nonterminal">$to</span>(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="macro-nonterminal">$ty</span>> {
<span class="kw">if </span><span class="self">self</span>.im.is_zero() {
<span class="self">self</span>.re.<span class="macro-nonterminal">$to</span>()
} <span class="kw">else </span>{
<span class="prelude-val">None
</span>}
}
};
} <span class="comment">// impl_to_primitive
// Returns None if Complex part is non-zero
</span><span class="kw">impl</span><T: ToPrimitive + Num> ToPrimitive <span class="kw">for </span>Complex<T> {
<span class="macro">impl_to_primitive!</span>(usize, to_usize);
<span class="macro">impl_to_primitive!</span>(isize, to_isize);
<span class="macro">impl_to_primitive!</span>(u8, to_u8);
<span class="macro">impl_to_primitive!</span>(u16, to_u16);
<span class="macro">impl_to_primitive!</span>(u32, to_u32);
<span class="macro">impl_to_primitive!</span>(u64, to_u64);
<span class="macro">impl_to_primitive!</span>(i8, to_i8);
<span class="macro">impl_to_primitive!</span>(i16, to_i16);
<span class="macro">impl_to_primitive!</span>(i32, to_i32);
<span class="macro">impl_to_primitive!</span>(i64, to_i64);
<span class="macro">impl_to_primitive!</span>(u128, to_u128);
<span class="macro">impl_to_primitive!</span>(i128, to_i128);
<span class="macro">impl_to_primitive!</span>(f32, to_f32);
<span class="macro">impl_to_primitive!</span>(f64, to_f64);
}
<span class="macro">macro_rules! </span>impl_from_primitive {
(<span class="macro-nonterminal">$ty</span>:ty, <span class="macro-nonterminal">$from_xx</span>:ident) => {
<span class="attr">#[inline]
</span><span class="kw">fn </span><span class="macro-nonterminal">$from_xx</span>(n: <span class="macro-nonterminal">$ty</span>) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>> {
<span class="prelude-val">Some</span>(Complex {
re: T::<span class="macro-nonterminal">$from_xx</span>(n)<span class="question-mark">?</span>,
im: T::zero(),
})
}
};
} <span class="comment">// impl_from_primitive
</span><span class="kw">impl</span><T: FromPrimitive + Num> FromPrimitive <span class="kw">for </span>Complex<T> {
<span class="macro">impl_from_primitive!</span>(usize, from_usize);
<span class="macro">impl_from_primitive!</span>(isize, from_isize);
<span class="macro">impl_from_primitive!</span>(u8, from_u8);
<span class="macro">impl_from_primitive!</span>(u16, from_u16);
<span class="macro">impl_from_primitive!</span>(u32, from_u32);
<span class="macro">impl_from_primitive!</span>(u64, from_u64);
<span class="macro">impl_from_primitive!</span>(i8, from_i8);
<span class="macro">impl_from_primitive!</span>(i16, from_i16);
<span class="macro">impl_from_primitive!</span>(i32, from_i32);
<span class="macro">impl_from_primitive!</span>(i64, from_i64);
<span class="macro">impl_from_primitive!</span>(u128, from_u128);
<span class="macro">impl_from_primitive!</span>(i128, from_i128);
<span class="macro">impl_from_primitive!</span>(f32, from_f32);
<span class="macro">impl_from_primitive!</span>(f64, from_f64);
}
<span class="kw">impl</span><T: NumCast + Num> NumCast <span class="kw">for </span>Complex<T> {
<span class="kw">fn </span>from<U: ToPrimitive>(n: U) -> <span class="prelude-ty">Option</span><<span class="self">Self</span>> {
<span class="prelude-val">Some</span>(Complex {
re: T::from(n)<span class="question-mark">?</span>,
im: T::zero(),
})
}
}
<span class="kw">impl</span><T, U> AsPrimitive<U> <span class="kw">for </span>Complex<T>
<span class="kw">where
</span>T: AsPrimitive<U>,
U: <span class="lifetime">'static </span>+ Copy,
{
<span class="kw">fn </span>as_(<span class="self">self</span>) -> U {
<span class="self">self</span>.re.as_()
}
}
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>test {
<span class="kw">use super</span>::<span class="kw-2">*</span>;
<span class="attr">#[test]
</span><span class="kw">fn </span>test_to_primitive() {
<span class="kw">let </span>a: Complex<u32> = Complex { re: <span class="number">3</span>, im: <span class="number">0 </span>};
<span class="macro">assert_eq!</span>(a.to_i32(), <span class="prelude-val">Some</span>(<span class="number">3_i32</span>));
<span class="kw">let </span>b: Complex<u32> = Complex { re: <span class="number">3</span>, im: <span class="number">1 </span>};
<span class="macro">assert_eq!</span>(b.to_i32(), <span class="prelude-val">None</span>);
<span class="kw">let </span>x: Complex<f32> = Complex { re: <span class="number">1.0</span>, im: <span class="number">0.1 </span>};
<span class="macro">assert_eq!</span>(x.to_f32(), <span class="prelude-val">None</span>);
<span class="kw">let </span>y: Complex<f32> = Complex { re: <span class="number">1.0</span>, im: <span class="number">0.0 </span>};
<span class="macro">assert_eq!</span>(y.to_f32(), <span class="prelude-val">Some</span>(<span class="number">1.0</span>));
<span class="kw">let </span>z: Complex<f32> = Complex { re: <span class="number">1.0</span>, im: <span class="number">0.0 </span>};
<span class="macro">assert_eq!</span>(z.to_i32(), <span class="prelude-val">Some</span>(<span class="number">1</span>));
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_from_primitive() {
<span class="kw">let </span>a: Complex<f32> = FromPrimitive::from_i32(<span class="number">2</span>).unwrap();
<span class="macro">assert_eq!</span>(a, Complex { re: <span class="number">2.0</span>, im: <span class="number">0.0 </span>});
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_num_cast() {
<span class="kw">let </span>a: Complex<f32> = NumCast::from(<span class="number">2_i32</span>).unwrap();
<span class="macro">assert_eq!</span>(a, Complex { re: <span class="number">2.0</span>, im: <span class="number">0.0 </span>});
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_as_primitive() {
<span class="kw">let </span>a: Complex<f32> = Complex { re: <span class="number">2.0</span>, im: <span class="number">0.2 </span>};
<span class="kw">let </span>a_: i32 = a.as_();
<span class="macro">assert_eq!</span>(a_, <span class="number">2_i32</span>);
}
}
</code></pre></div>
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