floatEpsAt

Returns the local epsilon of floating point type T.

Function parameters

Parameters

T:type
x:T

Functions in this namespace

Functions

FloatRepr
floatExponentBits: Returns the number of bits in the exponent of floating point type T.
floatMantissaBits: Returns the number of bits in the mantissa of floating point type T.
floatFractionalBits: Returns the number of fractional bits in the mantissa of floating point type T.
floatExponentMin: Returns the minimum exponent that can represent
floatExponentMax: Returns the maximum exponent that can represent
floatTrueMin: Returns the smallest subnormal number representable in floating point type T.
floatMin: Returns the smallest normal number representable in floating point type T.
floatMax: Returns the largest normal number representable in floating point type T.
floatEps: Returns the machine epsilon of floating point type T.
floatEpsAt: Returns the local epsilon of floating point type T.
inf: Returns the inf value for a floating point `Type`.
nan: Returns the canonical quiet NaN representation for a floating point `Type`.
snan: Returns a signalling NaN representation for a floating point `Type`.

Source

Implementation

pub inline fn floatEpsAt(comptime T: type, x: T) T {
    switch (@typeInfo(T)) {
        .float => |F| {
            const U: type = @Type(.{ .int = .{ .signedness = .unsigned, .bits = F.bits } });
            const u: U = @bitCast(x);
            const y: T = @bitCast(u ^ 1);
            return @abs(x - y);
        },
        else => @compileError("floatEpsAt only supports floats"),
    }
}