Function isNegativeZero [src]

Alias for std.math.iszero.isNegativeZero

Returns whether x is negative zero.

Prototype

pub inline fn isNegativeZero(x: anytype) bool

Example

 test isNegativeZero {
    inline for ([_]type{ f16, f32, f64, f80, f128 }) |T| {
        try expect(isNegativeZero(@as(T, -0.0)));
        try expect(!isNegativeZero(@as(T, 0.0)));
        try expect(!isNegativeZero(math.floatMin(T)));
        try expect(!isNegativeZero(math.floatMax(T)));
        try expect(!isNegativeZero(math.inf(T)));
        try expect(!isNegativeZero(-math.inf(T)));
    }
}

Source

  pub inline fn isNegativeZero(x: anytype) bool {
    const T = @TypeOf(x);
    const bit_count = @typeInfo(T).float.bits;
    const TBits = std.meta.Int(.unsigned, bit_count);
    return @as(TBits, @bitCast(x)) == @as(TBits, 1) << (bit_count - 1);
}  