Function mulWide [src]

Multiply a and b. Return type is wide enough to guarantee no overflow.

Prototype

pub fn mulWide(comptime T: type, a: T, b: T) std.meta.Int( @typeInfo(T).int.signedness, @typeInfo(T).int.bits * 2, )

Parameters

T: typea: Tb: T

Example

 test mulWide {
    try testing.expect(mulWide(u8, 5, 5) == 25);
    try testing.expect(mulWide(i8, 5, -5) == -25);
    try testing.expect(mulWide(u8, 100, 100) == 10000);
}

Source

  pub fn mulWide(comptime T: type, a: T, b: T) std.meta.Int(
    @typeInfo(T).int.signedness,
    @typeInfo(T).int.bits * 2,
) {
    const ResultInt = std.meta.Int(
        @typeInfo(T).int.signedness,
        @typeInfo(T).int.bits * 2,
    );
    return @as(ResultInt, a) * @as(ResultInt, b);
}  