Function sign [src]

Returns -1, 0, or 1. Supports integer and float types and vectors of integer and float types. Unsigned integer types will always return 0 or 1. Branchless.

Prototype

pub inline fn sign(i: anytype) @TypeOf(i)

Example

 test sign {
    try testSign();
    try comptime testSign();
}

Source

  pub inline fn sign(i: anytype) @TypeOf(i) {
    const T = @TypeOf(i);
    return switch (@typeInfo(T)) {
        .int, .comptime_int => @as(T, @intFromBool(i > 0)) - @as(T, @intFromBool(i < 0)),
        .float, .comptime_float => @as(T, @floatFromInt(@intFromBool(i > 0))) - @as(T, @floatFromInt(@intFromBool(i < 0))),
        .vector => |vinfo| blk: {
            switch (@typeInfo(vinfo.child)) {
                .int, .float => {
                    const zero: T = @splat(0);
                    const one: T = @splat(1);
                    break :blk @select(vinfo.child, i > zero, one, zero) - @select(vinfo.child, i < zero, one, zero);
                },
                else => @compileError("Expected vector of ints or floats, found " ++ @typeName(T)),
            }
        },
        else => @compileError("Expected an int, float or vector of one, found " ++ @typeName(T)),
    };
}  