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</pre><pre class="rust"><code><span class="kw">use </span><span class="kw">super</span>::BigInt;
<span class="kw">use </span><span class="kw">super</span>::Sign::NoSign;
<span class="kw">use </span>core::ops::{Shl, ShlAssign, Shr, ShrAssign};
<span class="kw">use </span>num_traits::{PrimInt, Signed, Zero};
<span class="macro">macro_rules! </span>impl_shift {
(@<span class="kw-2">ref </span><span class="macro-nonterminal">$Shx</span>:ident :: <span class="macro-nonterminal">$shx</span>:ident, <span class="macro-nonterminal">$ShxAssign</span>:ident :: <span class="macro-nonterminal">$shx_assign</span>:ident, <span class="macro-nonterminal">$rhs</span>:ty) =&gt; {
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;b</span>&gt; <span class="macro-nonterminal">$Shx</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;b </span><span class="macro-nonterminal">$rhs</span>&gt; <span class="kw">for </span>BigInt {
<span class="kw">type </span>Output = BigInt;
<span class="attribute">#[inline]
</span><span class="kw">fn </span><span class="macro-nonterminal">$shx</span>(<span class="self">self</span>, rhs: <span class="kw-2">&amp;</span><span class="lifetime">&#39;b </span><span class="macro-nonterminal">$rhs</span>) -&gt; BigInt {
<span class="macro-nonterminal">$Shx</span>::<span class="macro-nonterminal">$shx</span>(<span class="self">self</span>, <span class="kw-2">*</span>rhs)
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, <span class="lifetime">&#39;b</span>&gt; <span class="macro-nonterminal">$Shx</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;b </span><span class="macro-nonterminal">$rhs</span>&gt; <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>BigInt {
<span class="kw">type </span>Output = BigInt;
<span class="attribute">#[inline]
</span><span class="kw">fn </span><span class="macro-nonterminal">$shx</span>(<span class="self">self</span>, rhs: <span class="kw-2">&amp;</span><span class="lifetime">&#39;b </span><span class="macro-nonterminal">$rhs</span>) -&gt; BigInt {
<span class="macro-nonterminal">$Shx</span>::<span class="macro-nonterminal">$shx</span>(<span class="self">self</span>, <span class="kw-2">*</span>rhs)
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;b</span>&gt; <span class="macro-nonterminal">$ShxAssign</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;b </span><span class="macro-nonterminal">$rhs</span>&gt; <span class="kw">for </span>BigInt {
<span class="attribute">#[inline]
</span><span class="kw">fn </span><span class="macro-nonterminal">$shx_assign</span>(<span class="kw-2">&amp;mut </span><span class="self">self</span>, rhs: <span class="kw-2">&amp;</span><span class="lifetime">&#39;b </span><span class="macro-nonterminal">$rhs</span>) {
<span class="macro-nonterminal">$ShxAssign</span>::<span class="macro-nonterminal">$shx_assign</span>(<span class="self">self</span>, <span class="kw-2">*</span>rhs);
}
}
};
($(<span class="macro-nonterminal">$rhs</span>:ty),+) =&gt; {$(
<span class="kw">impl </span>Shl&lt;<span class="macro-nonterminal">$rhs</span>&gt; <span class="kw">for </span>BigInt {
<span class="kw">type </span>Output = BigInt;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>shl(<span class="self">self</span>, rhs: <span class="macro-nonterminal">$rhs</span>) -&gt; BigInt {
BigInt::from_biguint(<span class="self">self</span>.sign, <span class="self">self</span>.data &lt;&lt; rhs)
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Shl&lt;<span class="macro-nonterminal">$rhs</span>&gt; <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>BigInt {
<span class="kw">type </span>Output = BigInt;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>shl(<span class="self">self</span>, rhs: <span class="macro-nonterminal">$rhs</span>) -&gt; BigInt {
BigInt::from_biguint(<span class="self">self</span>.sign, <span class="kw-2">&amp;</span><span class="self">self</span>.data &lt;&lt; rhs)
}
}
<span class="kw">impl </span>ShlAssign&lt;<span class="macro-nonterminal">$rhs</span>&gt; <span class="kw">for </span>BigInt {
<span class="attribute">#[inline]
</span><span class="kw">fn </span>shl_assign(<span class="kw-2">&amp;mut </span><span class="self">self</span>, rhs: <span class="macro-nonterminal">$rhs</span>) {
<span class="self">self</span>.data &lt;&lt;= rhs
}
}
<span class="macro">impl_shift! </span>{ @<span class="kw-2">ref </span>Shl::shl, ShlAssign::shl_assign, <span class="macro-nonterminal">$rhs </span>}
<span class="kw">impl </span>Shr&lt;<span class="macro-nonterminal">$rhs</span>&gt; <span class="kw">for </span>BigInt {
<span class="kw">type </span>Output = BigInt;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>shr(<span class="self">self</span>, rhs: <span class="macro-nonterminal">$rhs</span>) -&gt; BigInt {
<span class="kw">let </span>round_down = shr_round_down(<span class="kw-2">&amp;</span><span class="self">self</span>, rhs);
<span class="kw">let </span>data = <span class="self">self</span>.data &gt;&gt; rhs;
<span class="kw">let </span>data = <span class="kw">if </span>round_down { data + <span class="number">1u8 </span>} <span class="kw">else </span>{ data };
BigInt::from_biguint(<span class="self">self</span>.sign, data)
}
}
<span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Shr&lt;<span class="macro-nonterminal">$rhs</span>&gt; <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>BigInt {
<span class="kw">type </span>Output = BigInt;
<span class="attribute">#[inline]
</span><span class="kw">fn </span>shr(<span class="self">self</span>, rhs: <span class="macro-nonterminal">$rhs</span>) -&gt; BigInt {
<span class="kw">let </span>round_down = shr_round_down(<span class="self">self</span>, rhs);
<span class="kw">let </span>data = <span class="kw-2">&amp;</span><span class="self">self</span>.data &gt;&gt; rhs;
<span class="kw">let </span>data = <span class="kw">if </span>round_down { data + <span class="number">1u8 </span>} <span class="kw">else </span>{ data };
BigInt::from_biguint(<span class="self">self</span>.sign, data)
}
}
<span class="kw">impl </span>ShrAssign&lt;<span class="macro-nonterminal">$rhs</span>&gt; <span class="kw">for </span>BigInt {
<span class="attribute">#[inline]
</span><span class="kw">fn </span>shr_assign(<span class="kw-2">&amp;mut </span><span class="self">self</span>, rhs: <span class="macro-nonterminal">$rhs</span>) {
<span class="kw">let </span>round_down = shr_round_down(<span class="self">self</span>, rhs);
<span class="self">self</span>.data &gt;&gt;= rhs;
<span class="kw">if </span>round_down {
<span class="self">self</span>.data += <span class="number">1u8</span>;
} <span class="kw">else if </span><span class="self">self</span>.data.is_zero() {
<span class="self">self</span>.sign = NoSign;
}
}
}
<span class="macro">impl_shift! </span>{ @<span class="kw-2">ref </span>Shr::shr, ShrAssign::shr_assign, <span class="macro-nonterminal">$rhs </span>}
)<span class="kw-2">*</span>};
}
<span class="macro">impl_shift! </span>{ u8, u16, u32, u64, u128, usize }
<span class="macro">impl_shift! </span>{ i8, i16, i32, i64, i128, isize }
<span class="comment">// Negative values need a rounding adjustment if there are any ones in the
// bits that are getting shifted out.
</span><span class="kw">fn </span>shr_round_down&lt;T: PrimInt&gt;(i: <span class="kw-2">&amp;</span>BigInt, shift: T) -&gt; bool {
<span class="kw">if </span>i.is_negative() {
<span class="kw">let </span>zeros = i.trailing_zeros().expect(<span class="string">&quot;negative values are non-zero&quot;</span>);
shift &gt; T::zero() &amp;&amp; shift.to_u64().map(|shift| zeros &lt; shift).unwrap_or(<span class="bool-val">true</span>)
} <span class="kw">else </span>{
<span class="bool-val">false
</span>}
}
</code></pre></div>
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