Function expectApproxEqRel [src]

This function is intended to be used only in tests. When the actual value is not approximately equal to the expected value, prints diagnostics to stderr to show exactly how they are not equal, then returns a test failure error. See math.approxEqRel for more information on the tolerance parameter. The types must be floating-point. actual and expected are coerced to a common type using peer type resolution.

Prototype

pub inline fn expectApproxEqRel(expected: anytype, actual: anytype, tolerance: anytype) !void

Example

 test expectApproxEqRel {
    inline for ([_]type{ f16, f32, f64, f128 }) |T| {
        const eps_value = comptime math.floatEps(T);
        const sqrt_eps_value = comptime @sqrt(eps_value);

        const pos_x: T = 12.0;
        const pos_y: T = pos_x + 2 * eps_value;
        const neg_x: T = -12.0;
        const neg_y: T = neg_x - 2 * eps_value;

        try expectApproxEqRel(pos_x, pos_y, sqrt_eps_value);
        try expectApproxEqRel(neg_x, neg_y, sqrt_eps_value);
    }
}

Source

  pub inline fn expectApproxEqRel(expected: anytype, actual: anytype, tolerance: anytype) !void {
    const T = @TypeOf(expected, actual, tolerance);
    return expectApproxEqRelInner(T, expected, actual, tolerance);
}  