An integral type behaving like a floating point type.
Examples:
Normalized!byte b; // Behaves like a float, but stores -1..1 in a byte as -127..127.
Normalized!uint u; // Stores 0..1 in a uint as 0..uint.max.
// Just use them as if they are floats.
b = 0.5;
u = 0.2;
b *= u;
u = b * u + 0.1;
assert(b < u);
assert(b + 0.05 > u);
// They are automatically capped at 0..1 for unsigned and -1..1 for signed.
b += 3.5;
assert(b == 1);
b = 10 * -0.3;
u = -2.4;
assert(b == -1);
assert(u == 0);
// .raw gives access to the underlying storage.
b = 0.5;
assert(b.raw == 63);
b.raw = -127;
assert(b == -1);
u = 0;
assert(u.raw == 0);
u.raw = 2147483648;
assert(u >= 0.49 && u <= 0.51);
// fromRaw constructs from the raw value.
auto x = Normalized!ubyte(0.4);
auto y = Normalized!ubyte.fromRaw(102); // 102/255
assert(x == y);
// The floating point type it behaves as is the smallest of [float, double, real] with
// at least as much precision as the underlying type.
static assert(is(Normalized!byte.float_type == float));
static assert(is(Normalized!uint.float_type == double));
static assert(is(Normalized!long.float_type == real));
// Normalized!T only contains a T, so a T[] and a Normalized!T[] can be
// casted to eachother.
static assert(Normalized!byte.sizeof == 1);
ubyte[3] rgb_b = [255, 102, 0];
auto rgb_f = cast(Normalized!ubyte[])rgb_b;
// rgb_f is now [1, 0.4, 0]
assert(rgb_f[0] == 1);
rgb_f[1] = 0.6; // Modifies the original byte in rgb_b.
assert(rgb_b[1] == 153);