std​::macros

Modules

builtin

Macros

assert!assert_eq!debug_assert!debug_assert_eq!fail!format!local_data_key!print!println!select!try!unimplemented!unreachable!vec!write!writeln!

std::macros::debug_assert_eq![src]

macro_rules! debug_assert_eq(
    ($($arg:tt)*) => (if cfg!(not(ndebug)) { assert_eq!($($arg)*); })
)

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

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

Unlike assert_eq!, debug_assert_eq! statements can be disabled by passing --cfg ndebug to the compiler. This makes debug_assert_eq! useful for checks that are too expensive to be present in a release build but may be helpful during development.

Example

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