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 </pre><pre class="rust"><code><span class="comment">// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at
 // http://rust-lang.org/COPYRIGHT.
 //
 // Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or
 // http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license
 // &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.

 </span><span class="doccomment">//! A Big integer (signed version: `BigInt`, unsigned version: `BigUint`).
 //!
 //! A `BigUint` is represented as a vector of `BigDigit`s.
 //! A `BigInt` is a combination of `BigUint` and `Sign`.
 //!
 //! Common numerical operations are overloaded, so we can treat them
 //! the same way we treat other numbers.
 //!
 //! ## Example
 //!
 //! ```rust
 //! # fn main() {
 //! use num_bigint::BigUint;
 //! use num_traits::{Zero, One};
 //! use std::mem::replace;
 //!
 //! // Calculate large fibonacci numbers.
 //! fn fib(n: usize) -&gt; BigUint {
 //!     let mut f0: BigUint = Zero::zero();
 //!     let mut f1: BigUint = One::one();
 //!     for _ in 0..n {
 //!         let f2 = f0 + &amp;f1;
 //!         // This is a low cost way of swapping f0 with f1 and f1 with f2.
 //!         f0 = replace(&amp;mut f1, f2);
 //!     }
 //!     f0
 //! }
 //!
 //! // This is a very large number.
 //! println!(&quot;fib(1000) = {}&quot;, fib(1000));
 //! # }
 //! ```
 //!
 //! It&#39;s easy to generate large random numbers:
 //!
 //! ```rust,ignore
 //! use num_bigint::{ToBigInt, RandBigInt};
 //!
 //! let mut rng = rand::thread_rng();
 //! let a = rng.gen_bigint(1000);
 //!
 //! let low = -10000.to_bigint().unwrap();
 //! let high = 10000.to_bigint().unwrap();
 //! let b = rng.gen_bigint_range(&amp;low, &amp;high);
 //!
 //! // Probably an even larger number.
 //! println!(&quot;{}&quot;, a * b);
 //! ```
 //!
 //! See the &quot;Features&quot; section for instructions for enabling random number generation.
 //!
 //! ## Features
 //!
 //! The `std` crate feature is enabled by default, and is mandatory before Rust
 //! 1.36 and the stabilized `alloc` crate.  If you depend on `num-bigint` with
 //! `default-features = false`, you must manually enable the `std` feature yourself
 //! if your compiler is not new enough.
 //!
 //! ### Random Generation
 //!
 //! `num-bigint` supports the generation of random big integers when the `rand`
 //! feature is enabled. To enable it include rand as
 //!
 //! ```toml
 //! rand = &quot;0.7&quot;
 //! num-bigint = { version = &quot;0.3&quot;, features = [&quot;rand&quot;] }
 //! ```
 //!
 //! Note that you must use the version of `rand` that `num-bigint` is compatible
 //! with: `0.7`.
 //!
 //!
 //! ## Compatibility
 //!
 //! The `num-bigint` crate is tested for rustc 1.31 and greater.

 </span><span class="attribute">#![doc(html_root_url = <span class="string">&quot;https://docs.rs/num-bigint/0.3&quot;</span>)]
 #![no_std]

 #[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 #[macro_use]
 </span><span class="kw">extern crate </span>std;

 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">mod </span>std_alloc {
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>std::borrow::Cow;
     <span class="attribute">#[cfg(any(feature = <span class="string">&quot;quickcheck&quot;</span>, feature = <span class="string">&quot;arbitrary&quot;</span>))]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>std::boxed::Box;
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>std::string::String;
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>std::vec::Vec;
 }

 <span class="attribute">#[cfg(not(feature = <span class="string">&quot;std&quot;</span>))]
 #[macro_use]
 </span><span class="kw">extern crate </span>alloc;

 <span class="attribute">#[cfg(not(feature = <span class="string">&quot;std&quot;</span>))]
 </span><span class="kw">mod </span>std_alloc {
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>alloc::borrow::Cow;
     <span class="attribute">#[cfg(any(feature = <span class="string">&quot;quickcheck&quot;</span>, feature = <span class="string">&quot;arbitrary&quot;</span>))]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>alloc::boxed::Box;
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>alloc::string::String;
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">use </span>alloc::vec::Vec;
 }

 <span class="kw">use </span>core::fmt;
 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">use </span>std::error::Error;

 <span class="attribute">#[macro_use]
 </span><span class="kw">mod </span>macros;

 <span class="kw">mod </span>bigint;
 <span class="kw">mod </span>biguint;

 <span class="attribute">#[cfg(feature = <span class="string">&quot;rand&quot;</span>)]
 </span><span class="kw">mod </span>bigrand;

 <span class="attribute">#[cfg(target_pointer_width = <span class="string">&quot;32&quot;</span>)]
 </span><span class="kw">type </span>UsizePromotion = u32;
 <span class="attribute">#[cfg(target_pointer_width = <span class="string">&quot;64&quot;</span>)]
 </span><span class="kw">type </span>UsizePromotion = u64;

 <span class="attribute">#[cfg(target_pointer_width = <span class="string">&quot;32&quot;</span>)]
 </span><span class="kw">type </span>IsizePromotion = i32;
 <span class="attribute">#[cfg(target_pointer_width = <span class="string">&quot;64&quot;</span>)]
 </span><span class="kw">type </span>IsizePromotion = i64;

 <span class="attribute">#[derive(Debug, Clone, PartialEq, Eq)]
 </span><span class="kw">pub struct </span>ParseBigIntError {
     kind: BigIntErrorKind,
 }

 <span class="attribute">#[derive(Debug, Clone, PartialEq, Eq)]
 </span><span class="kw">enum </span>BigIntErrorKind {
     Empty,
     InvalidDigit,
 }

 <span class="kw">impl </span>ParseBigIntError {
     <span class="kw">fn </span>__description(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
         <span class="kw">use </span><span class="kw">crate</span>::BigIntErrorKind::<span class="kw-2">*</span>;
         <span class="kw">match </span><span class="self">self</span>.kind {
             Empty =&gt; <span class="string">&quot;cannot parse integer from empty string&quot;</span>,
             InvalidDigit =&gt; <span class="string">&quot;invalid digit found in string&quot;</span>,
         }
     }

     <span class="kw">fn </span>empty() -&gt; <span class="self">Self </span>{
         ParseBigIntError {
             kind: BigIntErrorKind::Empty,
         }
     }

     <span class="kw">fn </span>invalid() -&gt; <span class="self">Self </span>{
         ParseBigIntError {
             kind: BigIntErrorKind::InvalidDigit,
         }
     }
 }

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>ParseBigIntError {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="self">self</span>.__description().fmt(f)
     }
 }

 <span class="attribute">#[cfg(feature = <span class="string">&quot;std&quot;</span>)]
 </span><span class="kw">impl </span>Error <span class="kw">for </span>ParseBigIntError {
     <span class="kw">fn </span>description(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
         <span class="self">self</span>.__description()
     }
 }

 <span class="doccomment">/// The error type returned when a checked conversion regarding big integer fails.
 </span><span class="attribute">#[cfg(has_try_from)]
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 </span><span class="kw">pub struct </span>TryFromBigIntError&lt;T&gt; {
     original: T,
 }

 <span class="attribute">#[cfg(has_try_from)]
 </span><span class="kw">impl</span>&lt;T&gt; TryFromBigIntError&lt;T&gt; {
     <span class="kw">fn </span>new(original: T) -&gt; <span class="self">Self </span>{
         TryFromBigIntError { original }
     }

     <span class="kw">fn </span>__description(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
         <span class="string">&quot;out of range conversion regarding big integer attempted&quot;
     </span>}

     <span class="doccomment">/// Extract the original value, if available. The value will be available
     /// if the type before conversion was either [`BigInt`] or [`BigUint`].
     ///
     /// [`BigInt`]: struct.BigInt.html
     /// [`BigUint`]: struct.BigUint.html
     </span><span class="kw">pub fn </span>into_original(<span class="self">self</span>) -&gt; T {
         <span class="self">self</span>.original
     }
 }

 <span class="attribute">#[cfg(all(feature = <span class="string">&quot;std&quot;</span>, has_try_from))]
 </span><span class="kw">impl</span>&lt;T&gt; std::error::Error <span class="kw">for </span>TryFromBigIntError&lt;T&gt;
 <span class="kw">where
     </span>T: fmt::Debug,
 {
     <span class="kw">fn </span>description(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
         <span class="self">self</span>.__description()
     }
 }

 <span class="attribute">#[cfg(has_try_from)]
 </span><span class="kw">impl</span>&lt;T&gt; fmt::Display <span class="kw">for </span>TryFromBigIntError&lt;T&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
         <span class="self">self</span>.__description().fmt(f)
     }
 }

 <span class="kw">pub use </span><span class="kw">crate</span>::biguint::BigUint;
 <span class="kw">pub use </span><span class="kw">crate</span>::biguint::ToBigUint;
 <span class="kw">pub use </span><span class="kw">crate</span>::biguint::U32Digits;
 <span class="kw">pub use </span><span class="kw">crate</span>::biguint::U64Digits;

 <span class="kw">pub use </span><span class="kw">crate</span>::bigint::BigInt;
 <span class="kw">pub use </span><span class="kw">crate</span>::bigint::Sign;
 <span class="kw">pub use </span><span class="kw">crate</span>::bigint::ToBigInt;

 <span class="attribute">#[cfg(feature = <span class="string">&quot;rand&quot;</span>)]
 </span><span class="kw">pub use </span><span class="kw">crate</span>::bigrand::{RandBigInt, RandomBits, UniformBigInt, UniformBigUint};

 <span class="kw">mod </span>big_digit {
     <span class="doccomment">/// A `BigDigit` is a `BigUint`&#39;s composing element.
     </span><span class="attribute">#[cfg(not(u64_digit))]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">type </span>BigDigit = u32;
     <span class="attribute">#[cfg(u64_digit)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">type </span>BigDigit = u64;

     <span class="doccomment">/// A `DoubleBigDigit` is the internal type used to do the computations.  Its
     /// size is the double of the size of `BigDigit`.
     </span><span class="attribute">#[cfg(not(u64_digit))]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">type </span>DoubleBigDigit = u64;
     <span class="attribute">#[cfg(u64_digit)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">type </span>DoubleBigDigit = u128;

     <span class="doccomment">/// A `SignedDoubleBigDigit` is the signed version of `DoubleBigDigit`.
     </span><span class="attribute">#[cfg(not(u64_digit))]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">type </span>SignedDoubleBigDigit = i64;
     <span class="attribute">#[cfg(u64_digit)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">type </span>SignedDoubleBigDigit = i128;

     <span class="comment">// `DoubleBigDigit` size dependent
     </span><span class="attribute">#[cfg(not(u64_digit))]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>BITS: u8 = <span class="number">32</span>;
     <span class="attribute">#[cfg(u64_digit)]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>BITS: u8 = <span class="number">64</span>;

     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>HALF_BITS: u8 = BITS / <span class="number">2</span>;
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>HALF: BigDigit = (<span class="number">1 </span>&lt;&lt; HALF_BITS) - <span class="number">1</span>;

     <span class="kw">const </span>LO_MASK: DoubleBigDigit = (<span class="number">1 </span>&lt;&lt; BITS) - <span class="number">1</span>;
     <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>MAX: BigDigit = LO_MASK <span class="kw">as </span>BigDigit;

     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>get_hi(n: DoubleBigDigit) -&gt; BigDigit {
         (n &gt;&gt; BITS) <span class="kw">as </span>BigDigit
     }
     <span class="attribute">#[inline]
     </span><span class="kw">fn </span>get_lo(n: DoubleBigDigit) -&gt; BigDigit {
         (n &amp; LO_MASK) <span class="kw">as </span>BigDigit
     }

     <span class="doccomment">/// Split one `DoubleBigDigit` into two `BigDigit`s.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>from_doublebigdigit(n: DoubleBigDigit) -&gt; (BigDigit, BigDigit) {
         (get_hi(n), get_lo(n))
     }

     <span class="doccomment">/// Join two `BigDigit`s into one `DoubleBigDigit`
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>to_doublebigdigit(hi: BigDigit, lo: BigDigit) -&gt; DoubleBigDigit {
         DoubleBigDigit::from(lo) | (DoubleBigDigit::from(hi) &lt;&lt; BITS)
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="num_bigint" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>