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John Doty 2024-03-08 11:03:01 -08:00
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1
third-party/vendor/overload/.cargo-checksum.json vendored Normal file
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{"files":{"Cargo.toml":"7dae2c1f39fcd51345ecd0c84ff5ffd2544087b2fce175d253d388c4e61af61c","LICENSE":"0d1bdcc9f95914fc1709781e65a75b85db7f73fd1c335bf6f7b1aae618df322e","README.md":"163212683c01ec376c6fc1d4b6acb10cc1cb4af622e9ddbd869a48c7ac9c6169","logo.png":"6992807474a15bf663aeeb357b6038cdbaed7f5787a26941d1fc006176c3a6ae","src/assignment.rs":"f4ff0b288ed0d7cd03bd53d3c5f452ffdd36e20d816f6f68762ace1c2609a445","src/binary.rs":"321c474d28d7b8367ba71ad6b8691d023cefce4d2b9417c454e57ada42b618c6","src/lib.rs":"542d5b297d3b9039450dce66e58b89b8d3707ee322230f7e9cc25f367e6338a1","src/unary.rs":"f2f87399a153e225acc4899651ad079bf02b4fe426fb5c94799eb2747b84a870","tests/assignment.rs":"635f4a214ad9e725d2f46d12983a96167ac7bd8af979e69d20bdcd8739d9e3a9","tests/binary.rs":"1acc26022414a6d54f7fe18d85c41433dec2b6adb6615d04a261f9b47c438b88","tests/unary.rs":"4bc733e466c19296bc3738f866b710fc421a04f6dd0180348bd2fddecdc88c51"},"package":"b15813163c1d831bf4a13c3610c05c0d03b39feb07f7e09fa234dac9b15aaf39"}

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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies
#
# If you believe there's an error in this file please file an
# issue against the rust-lang/cargo repository. If you're
# editing this file be aware that the upstream Cargo.toml
# will likely look very different (and much more reasonable)
[package]
edition = "2018"
name = "overload"
version = "0.1.1"
authors = ["Daniel Salvadori <danaugrs@gmail.com>"]
description = "Provides a macro to simplify operator overloading."
keywords = ["operator", "overloading", "macro", "op"]
categories = ["rust-patterns"]
license = "MIT"
repository = "https://github.com/danaugrs/overload"

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MIT License
Copyright (c) 2019 Daniel Augusto Rizzi Salvadori
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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third-party/vendor/overload/README.md vendored Normal file
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<p align="center"><img width="460" src="https://github.com/danaugrs/overload/blob/master/logo.png"></p>
<p align="center">
<a href="https://docs.rs/overload"><img src="https://docs.rs/overload/badge.svg"/></a>
<a href="https://crates.io/crates/overload"><img src="https://img.shields.io/crates/v/overload.svg"/></a>
</p>
Provides a macro to simplify operator overloading. See the [documentation](https://docs.rs/overload/) for details and supported operators.
## Example
```rust
extern crate overload;
use overload::overload;
use std::ops; // <- don't forget this or you'll get nasty errors
#[derive(PartialEq, Debug)]
struct Val {
v: i32
}
overload!((a: ?Val) + (b: ?Val) -> Val { Val { v: a.v + b.v } });
```
The macro call in the snippet above generates the following code:
```rust
impl ops::Add<Val> for Val {
type Output = Val;
fn add(self, b: Val) -> Self::Output {
let a = self;
Val { v: a.v + b.v }
}
}
impl ops::Add<&Val> for Val {
type Output = Val;
fn add(self, b: &Val) -> Self::Output {
let a = self;
Val { v: a.v + b.v }
}
}
impl ops::Add<Val> for &Val {
type Output = Val;
fn add(self, b: Val) -> Self::Output {
let a = self;
Val { v: a.v + b.v }
}
}
impl ops::Add<&Val> for &Val {
type Output = Val;
fn add(self, b: &Val) -> Self::Output {
let a = self;
Val { v: a.v + b.v }
}
}
```
We are now able to add `Val`s and `&Val`s in any combination:
```rust
assert_eq!(Val{v:3} + Val{v:5}, Val{v:8});
assert_eq!(Val{v:3} + &Val{v:5}, Val{v:8});
assert_eq!(&Val{v:3} + Val{v:5}, Val{v:8});
assert_eq!(&Val{v:3} + &Val{v:5}, Val{v:8});
```

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#[doc(hidden)]
#[macro_export(local_inner_macros)]
macro_rules! _overload_assignment {
(+=, $($t:tt)+) => (_overload_assignment_internal!(AddAssign, add_assign, $($t)+););
(-=, $($t:tt)+) => (_overload_assignment_internal!(SubAssign, sub_assign, $($t)+););
(*=, $($t:tt)+) => (_overload_assignment_internal!(MulAssign, mul_assign, $($t)+););
(/=, $($t:tt)+) => (_overload_assignment_internal!(DivAssign, div_assign, $($t)+););
(%=, $($t:tt)+) => (_overload_assignment_internal!(RemAssign, rem_assign, $($t)+););
(&=, $($t:tt)+) => (_overload_assignment_internal!(BitAndAssign, bitand_assign, $($t)+););
(|=, $($t:tt)+) => (_overload_assignment_internal!(BitOrAssign, bitor_assign, $($t)+););
(^=, $($t:tt)+) => (_overload_assignment_internal!(BitXorAssign, bitxor_assign, $($t)+););
(<<=, $($t:tt)+) => (_overload_assignment_internal!(ShlAssign, shl_assign, $($t)+););
(>>=, $($t:tt)+) => (_overload_assignment_internal!(ShrAssign, shr_assign, $($t)+););
}
#[doc(hidden)]
#[macro_export(local_inner_macros)]
macro_rules! _overload_assignment_internal {
($op_trait:ident, $op_fn:ident, $li:ident, $lt:ty, $ri:ident, $rt:ty, $body:block) => (
impl ops::$op_trait<$rt> for $lt {
fn $op_fn(&mut self, $ri: $rt) {
let $li = self;
$body
}
}
);
}

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#[doc(hidden)]
#[macro_export(local_inner_macros)]
macro_rules! _overload_binary {
(+, $($t:tt)+) => (_overload_binary_internal!(Add, add, $($t)+););
(-, $($t:tt)+) => (_overload_binary_internal!(Sub, sub, $($t)+););
(*, $($t:tt)+) => (_overload_binary_internal!(Mul, mul, $($t)+););
(/, $($t:tt)+) => (_overload_binary_internal!(Div, div, $($t)+););
(%, $($t:tt)+) => (_overload_binary_internal!(Rem, rem, $($t)+););
(&, $($t:tt)+) => (_overload_binary_internal!(BitAnd, bitand, $($t)+););
(|, $($t:tt)+) => (_overload_binary_internal!(BitOr, bitor, $($t)+););
(^, $($t:tt)+) => (_overload_binary_internal!(BitXor, bitxor, $($t)+););
(<<, $($t:tt)+) => (_overload_binary_internal!(Shl, shl, $($t)+););
(>>, $($t:tt)+) => (_overload_binary_internal!(Shr, shr, $($t)+););
}
#[doc(hidden)]
#[macro_export(local_inner_macros)]
macro_rules! _overload_binary_internal {
($op_trait:ident, $op_fn:ident, $li:ident, $lt:ty, $ri:ident, $rt:ty, $out:ty, $body:block) => (
impl ops::$op_trait<$rt> for $lt {
type Output = $out;
fn $op_fn(self, $ri: $rt) -> Self::Output {
let $li = self;
$body
}
}
);
}

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//! Provides a macro to simplify operator overloading.
//!
//! To use, include the following:
//! ```
//! extern crate overload;
//! use overload::overload;
//! use std::ops; // <- don't forget this or you'll get nasty errors
//! ```
//!
//! # Introduction
//!
//! Suppose we have the following `struct` definition:
//! ```
//! #[derive(PartialEq, Debug)]
//! struct Val {
//! v: i32
//! }
//! ```
//! We can overload the addition of `Val`s like so:
//! ```
//! # extern crate overload;
//! # use overload::overload;
//! # use std::ops;
//! # #[derive(PartialEq, Debug)]
//! # struct Val {
//! # v: i32
//! # }
//! overload!((a: Val) + (b: Val) -> Val { Val { v: a.v + b.v } });
//! ```
//! The macro call above generates the following code:
//! ```ignore
//! impl ops::Add<Val> for Val {
//! type Output = Val;
//! fn add(self, b: Val) -> Self::Output {
//! let a = self;
//! Val { v: a.v + b.v }
//! }
//! }
//! ```
//! We are now able to add `Val`s:
//! ```
//! # extern crate overload;
//! # use overload::overload;
//! # use std::ops;
//! # #[derive(PartialEq, Debug)]
//! # struct Val {
//! # v: i32
//! # }
//! # overload!((a: Val) + (b: Val) -> Val { Val { v: a.v + b.v } });
//! assert_eq!(Val{v:3} + Val{v:5}, Val{v:8});
//! ```
//!
//! # Owned and borrowed types
//!
//! If we also wanted to overload addition for the borrowed type `&Val` we could write:
//! ```
//! # extern crate overload;
//! # use overload::overload;
//! # use std::ops;
//! # #[derive(PartialEq, Debug)]
//! # struct Val {
//! # v: i32
//! # }
//! overload!((a: &Val) + (b: &Val) -> Val { Val { v: a.v + b.v } });
//! ```
//! We might also want to overload addition between the owned and borrowed types:
//! ```
//! # extern crate overload;
//! # use overload::overload;
//! # use std::ops;
//! # #[derive(PartialEq, Debug)]
//! # struct Val {
//! # v: i32
//! # }
//! overload!((a: Val) + (b: &Val) -> Val { Val { v: a.v + b.v } });
//! overload!((a: &Val) + (b: Val) -> Val { Val { v: a.v + b.v } });
//! ```
//! Let's see how we can write these combinations more concisely.
//!
//! We can include a `?` in front of a type to indicate that it should stand in for both the owned and borrowed type.
//!
//! To overload addition for all four combinations between `Val` and `&Val` we can therefore simply include a `?` in front of both types:
//! ```
//! # extern crate overload;
//! # use overload::overload;
//! # use std::ops;
//! # #[derive(PartialEq, Debug)]
//! # struct Val {
//! # v: i32
//! # }
//! overload!((a: ?Val) + (b: ?Val) -> Val { Val { v: a.v + b.v } });
//! ```
//! The macro call above generates the following code:
//! ```ignore
//! impl ops::Add<Val> for Val {
//! type Output = Val;
//! fn add(self, b: Val) -> Self::Output {
//! let a = self;
//! Val { v: a.v + b.v }
//! }
//! }
//!
//! impl ops::Add<&Val> for Val {
//! type Output = Val;
//! fn add(self, b: &Val) -> Self::Output {
//! let a = self;
//! Val { v: a.v + b.v }
//! }
//! }
//!
//! impl ops::Add<Val> for &Val {
//! type Output = Val;
//! fn add(self, b: Val) -> Self::Output {
//! let a = self;
//! Val { v: a.v + b.v }
//! }
//! }
//!
//! impl ops::Add<&Val> for &Val {
//! type Output = Val;
//! fn add(self, b: &Val) -> Self::Output {
//! let a = self;
//! Val { v: a.v + b.v }
//! }
//! }
//! ```
//! We are now able to add `Val`s and `&Val`s in any combination:
//! ```
//! # extern crate overload;
//! # use overload::overload;
//! # use std::ops;
//! # #[derive(PartialEq, Debug)]
//! # struct Val {
//! # v: i32
//! # }
//! # overload!((a: ?Val) + (b: ?Val) -> Val { Val { v: a.v + b.v } });
//! assert_eq!(Val{v:3} + Val{v:5}, Val{v:8});
//! assert_eq!(Val{v:3} + &Val{v:5}, Val{v:8});
//! assert_eq!(&Val{v:3} + Val{v:5}, Val{v:8});
//! assert_eq!(&Val{v:3} + &Val{v:5}, Val{v:8});
//! ```
//!
//! # Binary operators
//!
//! The general syntax to overload a binary operator between types `<a_type>` and `<b_type>` is:
//! ```ignore
//! overload!((<a_ident>: <a_type>) <op> (<b_ident>: <b_type>) -> <out_type> { /*body*/ });
//! ```
//! Inside the body you can use `<a_ident>` and `<b_ident>` freely to perform any computation.
//!
//! The last line of the body needs to be an expression (i.e. no `;` at the end of the line) of type `<out_type>`.
//!
//! | Operator | Example | Trait |
//! |----------|-----------------------------------------------------------------|--------|
//! | + | `overload!((a: A) + (b: B) -> C { /*...*/ );` | Add |
//! | - | `overload!((a: A) - (b: B) -> C { /*...*/ );` | Sub |
//! | * | `overload!((a: A) * (b: B) -> C { /*...*/ );` | Mul |
//! | / | `overload!((a: A) / (b: B) -> C { /*...*/ );` | Div |
//! | % | `overload!((a: A) % (b: B) -> C { /*...*/ );` | Rem |
//! | & | `overload!((a: A) & (b: B) -> C { /*...*/ );` | BitAnd |
//! | \| | <code>overload!((a: A) &vert; (b: B) -> C { /\*...*\/ );</code> | BitOr |
//! | ^ | `overload!((a: A) ^ (b: B) -> C { /*...*/ );` | BitXor |
//! | << | `overload!((a: A) << (b: B) -> C { /*...*/ );` | Shl |
//! | >> | `overload!((a: A) >> (b: B) -> C { /*...*/ );` | Shr |
//!
//! # Assignment operators
//!
//! The general syntax to overload an assignment operator between types `<a_type>` and `<b_type>` is:
//! ```ignore
//! overload!((<a_ident>: &mut <a_type>) <op> (<b_ident>: <b_type>) { /*body*/ });
//! ```
//! Inside the body you can use `<a_ident>` and `<b_ident>` freely to perform any computation and mutate `<a_ident>` as desired.
//!
//! | Operator | Example | Trait |
//! |----------|------------------------------------------------------------------|--------------|
//! | += | `overload!((a: &mut A) += (b: B) { /*...*/ );` | AddAssign |
//! | -= | `overload!((a: &mut A) -= (b: B) { /*...*/ );` | SubAssign |
//! | *= | `overload!((a: &mut A) *= (b: B) { /*...*/ );` | MulAssign |
//! | /= | `overload!((a: &mut A) /= (b: B) { /*...*/ );` | DivAssign |
//! | %= | `overload!((a: &mut A) %= (b: B) { /*...*/ );` | RemAssign |
//! | &= | `overload!((a: &mut A) &= (b: B) { /*...*/ );` | BitAndAssign |
//! | \|= | <code>overload!((a: &mut A) &vert;= (b: B) { /\*...*\/ );</code> | BitOrAssign |
//! | ^= | `overload!((a: &mut A) ^= (b: B) { /*...*/ );` | BitXorAssign |
//! | <<= | `overload!((a: &mut A) <<= (b: B) { /*...*/ );` | ShlAssign |
//! | >>= | `overload!((a: &mut A) >>= (b: B) { /*...*/ );` | ShrAssign |
//!
//! # Unary operators
//!
//! The general syntax to overload a unary operator for type `<a_type>` is:
//! ```ignore
//! overload!(<op> (<a_ident>: <a_type>) -> <out_type> { /*body*/ });
//! ```
//! Inside the body you can use `<a_ident>` freely to perform any computation.
//!
//! The last line of the body needs to be an expression (i.e. no `;` at the end of the line) of type `<out_type>`.
//!
//! | Operator | Example | Trait |
//! |----------|---------------------------------------------------------|-------|
//! | - | `overload!(- (a: A) -> B { /*...*/ );` | Neg |
//! | ! | `overload!(! (a: A) -> B { /*...*/ );` | Not |
//!
//! # Notes
//!
//! Remember that you can only overload operators between one or more types if at least one of the types is defined in the current crate.
#[macro_use]
mod unary;
#[macro_use]
mod assignment;
#[macro_use]
mod binary;
/// Overloads an operator. See the [module level documentation](index.html) for more information.
#[macro_export(local_inner_macros)]
macro_rules! overload {
// Unary (both owned and borrowed)
($op:tt ($i:ident : ? $t:ty) -> $out:ty $body:block) => (
_overload_unary!($op, $i, $t, $out, $body);
_overload_unary!($op, $i, &$t, $out, $body);
);
// Unary (either owned or borrowed)
($op:tt ($i:ident : $t:ty) -> $out:ty $body:block) => (
_overload_unary!($op, $i, $t, $out, $body);
);
// Assignment (both owned and borrowed)
(($li:ident : &mut $lt:ty) $op:tt ($ri:ident : ? $rt:ty) $body:block) => (
_overload_assignment!($op, $li, $lt, $ri, $rt, $body);
_overload_assignment!($op, $li, $lt, $ri, &$rt, $body);
);
// Assignment (either owned or borrowed)
(($li:ident : &mut $lt:ty) $op:tt ($ri:ident : $rt:ty) $body:block) => (
_overload_assignment!($op, $li, $lt, $ri, $rt, $body);
);
// Binary (both - both)
(($li:ident : ? $lt:ty) $op:tt ($ri:ident : ? $rt:ty) -> $out:ty $body:block) => (
_overload_binary!($op, $li, $lt, $ri, $rt, $out, $body);
_overload_binary!($op, $li, $lt, $ri, &$rt, $out, $body);
_overload_binary!($op, $li, &$lt, $ri, $rt, $out, $body);
_overload_binary!($op, $li, &$lt, $ri, &$rt, $out, $body);
);
// Binary (both - either)
(($li:ident : ? $lt:ty) $op:tt ($ri:ident : $rt:ty) -> $out:ty $body:block) => (
_overload_binary!($op, $li, $lt, $ri, $rt, $out, $body);
_overload_binary!($op, $li, &$lt, $ri, $rt, $out, $body);
);
// Binary (either - both)
(($li:ident : $lt:ty) $op:tt ($ri:ident : ? $rt:ty) -> $out:ty $body:block) => (
_overload_binary!($op, $li, $lt, $ri, $rt, $out, $body);
_overload_binary!($op, $li, $lt, $ri, &$rt, $out, $body);
);
// Binary (either - either)
(($li:ident : $lt:ty) $op:tt ($ri:ident : $rt:ty) -> $out:ty $body:block) => (
_overload_binary!($op, $li, $lt, $ri, $rt, $out, $body);
);
}

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#[doc(hidden)]
#[macro_export(local_inner_macros)]
macro_rules! _overload_unary {
(-, $($t:tt)+) => (_overload_unary_internal!(Neg, neg, $($t)+););
(!, $($t:tt)+) => (_overload_unary_internal!(Not, not, $($t)+););
}
#[doc(hidden)]
#[macro_export(local_inner_macros)]
macro_rules! _overload_unary_internal {
($op_trait:ident, $op_fn:ident, $i:ident, $t:ty, $out:ty, $body:block) => (
impl ops::$op_trait for $t {
type Output = $out;
fn $op_fn(self) -> Self::Output {
let $i = self;
$body
}
}
);
}

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extern crate overload;
use overload::overload;
use std::ops;
#[derive(PartialEq, Debug)]
struct A(i32);
#[derive(PartialEq, Debug)]
struct B(i32);
overload!((a: &mut A) += (b: B) { a.0 += b.0; });
#[test]
fn add_assign() {
let mut a = A(3);
a += B(4);
assert_eq!(A(3 + 4), a);
}
overload!((a: &mut A) -= (b: B) { a.0 -= b.0; });
#[test]
fn sub_assign() {
let mut a = A(3);
a -= B(4);
assert_eq!(A(3 - 4), a);
}
overload!((a: &mut A) *= (b: B) { a.0 *= b.0; });
#[test]
fn mul_assign() {
let mut a = A(3);
a *= B(4);
assert_eq!(A(3 * 4), a);
}
overload!((a: &mut A) /= (b: B) { a.0 /= b.0; });
#[test]
fn div_assign() {
let mut a = A(6);
a /= B(3);
assert_eq!(A(6 / 3), a);
}
overload!((a: &mut A) %= (b: B) { a.0 %= b.0; });
#[test]
fn rem_assign() {
let mut a = A(6);
a %= B(4);
assert_eq!(A(6 % 4), a);
}
overload!((a: &mut A) &= (b: B) { a.0 &= b.0; });
#[test]
fn bitand_assign() {
let mut a = A(6);
a &= B(4);
assert_eq!(A(6 & 4), a);
}
overload!((a: &mut A) |= (b: B) { a.0 |= b.0; });
#[test]
fn bitor_assign() {
let mut a = A(6);
a |= B(4);
assert_eq!(A(6 | 4), a);
}
overload!((a: &mut A) ^= (b: B) { a.0 ^= b.0; });
#[test]
fn bitxor_assign() {
let mut a = A(6);
a ^= B(4);
assert_eq!(A(6 ^ 4), a);
}
overload!((a: &mut A) <<= (b: B) { a.0 <<= b.0; });
#[test]
fn shl_assign() {
let mut a = A(6);
a <<= B(4);
assert_eq!(A(6 << 4), a);
}
overload!((a: &mut A) >>= (b: B) { a.0 >>= b.0; });
#[test]
fn shr_assign() {
let mut a = A(6);
a >>= B(4);
assert_eq!(A(6 >> 4), a);
}

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extern crate overload;
use overload::overload;
use std::ops;
#[derive(PartialEq, Debug)]
struct A(i32);
#[derive(PartialEq, Debug)]
struct B(i32);
#[derive(PartialEq, Debug)]
struct C(i32);
overload!((a: A) + (b: B) -> C { C(a.0 + b.0) });
#[test]
fn add() {
assert_eq!(A(3) + B(4), C(3 + 4));
}
overload!((a: A) - (b: B) -> C { C(a.0 - b.0) });
#[test]
fn sub() {
assert_eq!(A(3) - B(4), C(3 - 4));
}
overload!((a: A) * (b: B) -> C { C(a.0 * b.0) });
#[test]
fn mul() {
assert_eq!(A(3) * B(4), C(3 * 4));
}
overload!((a: A) / (b: B) -> C { C(a.0 / b.0) });
#[test]
fn div() {
assert_eq!(A(6) / B(3), C(6 / 3));
}
overload!((a: A) % (b: B) -> C { C(a.0 % b.0) });
#[test]
fn rem() {
assert_eq!(A(6) % B(4), C(6 % 4));
}
overload!((a: A) & (b: B) -> C { C(a.0 & b.0) });
#[test]
fn bitand() {
assert_eq!(A(6) & B(4), C(6 & 4));
}
overload!((a: A) | (b: B) -> C { C(a.0 | b.0) });
#[test]
fn bitor() {
assert_eq!(A(6) | B(4), C(6 | 4));
}
overload!((a: A) ^ (b: B) -> C { C(a.0 ^ b.0) });
#[test]
fn bitxor() {
assert_eq!(A(6) ^ B(4), C(6 ^ 4));
}
overload!((a: A) << (b: B) -> C { C(a.0 << b.0) });
#[test]
fn shl() {
assert_eq!(A(6) << B(4), C(6 << 4));
}
overload!((a: A) >> (b: B) -> C { C(a.0 >> b.0) });
#[test]
fn shr() {
assert_eq!(A(6) >> B(4), C(6 >> 4));
}

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third-party/vendor/overload/tests/unary.rs vendored Normal file
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extern crate overload;
use overload::overload;
use std::ops;
#[derive(PartialEq, Debug)]
struct A(i32);
#[derive(PartialEq, Debug)]
struct B(i32);
overload!(- (a: A) -> B { B(-a.0) });
#[test]
fn neg() {
assert_eq!(-A(3), B(-3));
}
overload!(! (a: A) -> B { B(!a.0) });
#[test]
fn not() {
assert_eq!(!A(3), B(!3));
}