std::debug_assert_eq! [] [src]

( $ ( $ arg : tt ) * ) => (
if cfg ! ( debug_assertions ) { assert_eq ! ( $ ( $ arg ) * ) ; } )

Asserts that two expressions are equal to each other, testing equality in both directions.

On panic, this macro will print the values of the expressions.

Unlike assert_eq!`assert_eq!,`, debug_assert_eq!`debug_assert_eq!statements are only enabled in non optimized builds by default. An optimized build will omit all` statements are only enabled in non optimized builds by default. An optimized build will omit all debug_assert_eq!`debug_assert_eq!statements unless` statements unless -C debug-assertions`-C debug-assertionsis passed to the compiler. This makes` is passed to the compiler. This makes debug_assert_eq!`debug_assert_eq!` useful for checks that are too expensive to be present in a release build but may be helpful during development.

Examples

fn main() { let a = 3; let b = 1 + 2; debug_assert_eq!(a, b); }
let a = 3;
let b = 1 + 2;
debug_assert_eq!(a, b);