Macro compile_ops::ternary

ternary!() { /* proc-macro */ }

Ternary operations with $bool:expr ? $code:expr $(! else_code)? syntax for shorter and more legible conditionals.

This macro expand to if bool_expr { code } else { else_code } so does not prevent you for declaring new scopes,take it count in position-sensitive code,because inner blocks can access outer ones this is not typically a problem for safe code.

Because procedural macros does not expand if them are inside the arguments of another,you can't nest ternary as you can do with normal if statements.

Examples

#![feature(proc_macro_hygiene)] // needed here due to the use in let
                                // statements but generally unneccesary
use compile_ops::ternary;
 
let mut one = 1;
let mut two = ternary!(one == 1 ? 2 ! 3);
 
assert_eq!(two, 2);
 
one = 2;
two = ternary!(one == 1 ? 2 ! 3);
 
ternary!(two == 3 ? one = 1);
 
assert_eq!(two, 3);
assert_eq!(one, 1);