Macro impl_ops::impl_op_ex

macro_rules! impl_op_ex {
    ($op:tt |$lhs_i:ident : &mut $lhs:path, $rhs_i:ident : &$rhs:path| $body:block) => { ... };
    ($op:tt |$lhs_i:ident : &mut $lhs:path, $rhs_i:ident : $rhs:path| $body:block) => { ... };
    ($op:tt |$lhs_i:ident : &$lhs:path| -> $out:path $body:block) => { ... };
    ($op:tt |$lhs_i:ident : &$lhs:path, $rhs_i:ident : &$rhs:path| -> $out:path $body:block) => { ... };
    ($op:tt |$lhs_i:ident : &$lhs:path, $rhs_i:ident : $rhs:path| -> $out:path $body:block) => { ... };
    ($op:tt |$lhs_i:ident : $lhs:path|  -> $out:path $body:block) => { ... };
    ($op:tt |$lhs_i:ident : $lhs:path, $rhs_i:ident : &$rhs:path| -> $out:path $body:block) => { ... };
    ($op:tt |$lhs_i:ident : $lhs:path, $rhs_i:ident : $rhs:path| -> $out:path $body:block) => { ... };
}

Overloads an operator using the given closure as its body. Generates overloads for both owned and borrowed variants where possible.

Used with the same syntax as impl_op! (see the module level documentation for more information).

Expands any borrowed inputs into both owned and borrowed variants.

impl_op_ex!(op |a: &LHS, b: &RHS| -> OUT {...}); gets expanded to

impl_op!(op |a: LHS, b: RHS| -> OUT {...});
impl_op!(op |a: LHS, b: &RHS| -> OUT {...});
impl_op!(op |a: &LHS, b: RHS| -> OUT {...});
impl_op!(op |a: &LHS, b: &RHS| -> OUT {...});

and impl_op_ex!(op |a: &LHS, b: RHS| -> OUT {...}); gets expanded to

impl_op!(op |a: LHS, b: RHS| -> OUT {...});
impl_op!(op |a: &LHS, b: RHS| -> OUT {...});

Examples

#[macro_use] extern crate impl_ops;
use std::ops;

impl_op_ex!(+ |a: &DonkeyKong, b: &DonkeyKong| -> i32 { a.bananas + b.bananas });

fn main() {
    let total_bananas = &DonkeyKong::new(2) + &DonkeyKong::new(4);
    assert_eq!(6, total_bananas);
    let total_bananas = &DonkeyKong::new(2) + DonkeyKong::new(4);
    assert_eq!(6, total_bananas);
    let total_bananas = DonkeyKong::new(2) + &DonkeyKong::new(4);
    assert_eq!(6, total_bananas);
    let total_bananas = DonkeyKong::new(2) + DonkeyKong::new(4);
    assert_eq!(6, total_bananas);
}