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Enum member `std.random.isUniformRNG`

Test if Rng is a random-number generator. The overload taking a ElementType also makes sure that the Rng generates values of that type.


						
				enum isUniformRNG(Rng, ElementType)
				 = .isUniformRNG!Rng && is(std.range.primitives.ElementType!Rng == ElementType);
						
						
				enum isUniformRNG(Rng)
				 = isInputRange!Rng && is(typeof(()
{
static assert(Rng.isUniformRandom);
}
));

A random-number generator has at least the following features:

it's an InputRange
it has a 'bool isUniformRandom' field readable in CTFE

Example

struct NoRng
{
    @property uint front() {return 0;}
    @property bool empty() {return false;}
    void popFront() {}
}
static assert(!isUniformRNG!(NoRng));

struct validRng
{
    @property uint front() {return 0;}
    @property bool empty() {return false;}
    void popFront() {}

    enum isUniformRandom = true;
}
static assert(isUniformRNG!(validRng, uint));
static assert(isUniformRNG!(validRng));

Authors

Andrei Alexandrescu Masahiro Nakagawa (Xorshift random generator) Joseph Rushton Wakeling (Algorithm D for random sampling) Ilya Yaroshenko (Mersenne Twister implementation, adapted from mir-random)

License

Boost License 1.0.