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Enum member `std.random.isSeedable`

Test if Rng is seedable. The overload taking a SeedType also makes sure that the Rng can be seeded with SeedType.


						
				enum isSeedable(Rng, SeedType)
				 = isUniformRNG!Rng && is(typeof(()
{
Rng r = void;
SeedType s = void;
r.seed(s);
}
));
						
						
				enum isSeedable(Rng)
				 = isUniformRNG!Rng && is(typeof(()
{
Rng r = void;
alias SeedType = typeof(r.front);
SeedType s = void;
r.seed(s);
}
));

A seedable random-number generator has the following additional features:

it has a 'seed(ElementType)' function

Example

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

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

struct seedRng
{
    @property uint front() {return 0;}
    @property bool empty() {return false;}
    void popFront() {}
    void seed(uint val){}
    enum isUniformRandom = true;
}
static assert(isSeedable!(seedRng, uint));
static assert(!isSeedable!(seedRng, ulong));
static assert(isSeedable!(seedRng));

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.