std​::macros

[src]

std::macros::assert_eq

macro_rules! assert_eq(
    ($given:expr , $expected:expr) => ({
        let given_val = &($given);
        let expected_val = &($expected);
        // check both directions of equality....
        if !((*given_val == *expected_val) &&
             (*expected_val == *given_val)) {
            fail!("assertion failed: `(left == right) && (right == left)` \
                   (left: `{}`, right: `{}`)", *given_val, *expected_val)
        }
    })
)

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.

Example

let a = 3;
let b = 1 + 2;
assert_eq!(a, b);