Random Number

headers: Kokkos_Core.hpp, Kokkos_Complex.hpp

template<class Generator> struct rand<Generator, gen_data_type>

• KOKKOS_INLINE_FUNCTION static gen_func_type max(){return type_value}

• KOKKOS_INLINE_FUNCTION static gen_func_type draw(Generator& gen) {return gen_data_type((gen.rand()&gen_return_value)}

• KOKKOS_INLINE_FUNCTION static gen_func_type draw(Generator& gen, const gen_data_type& range) {return gen_data_type((gen.rand(range));}

• KOKKOS_INLINE_FUNCTION static gen_func_type draw(Generator& gen, const gen_data_type& start, const gen_data_type& end) {return gen_data_type(gen.rand(start,end));}

Function specializations for gen_data_type, gen_func_type and type_value

All functions and classes listed here are part of the Kokkos:: namespace.

gen_data_type	gen_func_type	type_value	gen_return_value ---
char	short	127	(&0xff+256)%256
short	short	32767	(&0xffff+65536)%32768
int	int	MAX_RAND	?
uint	uint	MAX_URAND	?
long	long	MAX_RAND or MAX_RAND64	?
ulong	ulong	MAX_RAND or MAX_RAND64	?
long long	long long	MAX_RAND64	?
ulong long	ulong long	MAX_URAND64	?
float	float	1.0f	?
double	double	1.0	?
complex	complex	1.0,1.0	?
complex	complex	1.0,1.0	?

where the maximum values of the XorShift function values are given by the following enums.

• enum {MAX_URAND = 0xffffffffU};
• enum {MAX_URAND64 = 0xffffffffffffffffULL-1};
• enum {MAX_RAND = static_cast(0xffffffffU/2)};
• enum {MAX_RAND64 = static_cast<int64_t>(0xffffffffffffffffULL/2-1)};