subtractive_rng Class Reference

#include <_function.h>

Inheritance diagram for subtractive_rng:

Collaboration diagram for subtractive_rng:

Public Member Functions
_STLP_UINT32_T	operator() (_STLP_UINT32_T __limit)
void	_M_initialize (_STLP_UINT32_T __seed)
	subtractive_rng (unsigned int __seed)
	subtractive_rng ()

Private Attributes
_STLP_UINT32_T	_M_table [55]
_STLP_UINT32_T	_M_index1
_STLP_UINT32_T	_M_index2

Additional Inherited Members
Public Types inherited from unary_function< _STLP_UINT32_T, _STLP_UINT32_T >
typedef _STLP_UINT32_T	argument_type
typedef _STLP_UINT32_T	result_type
Protected Member Functions inherited from unary_function< _STLP_UINT32_T, _STLP_UINT32_T >
	~unary_function ()

Detailed Description

Definition at line 388 of file _function.h.

Constructor & Destructor Documentation

subtractive_rng() [1/2]

subtractive_rng::subtractive_rng ( unsigned int  __seed )

inline

Definition at line 419 of file _function.h.

{ _M_initialize(__seed); }

subtractive_rng() [2/2]

subtractive_rng::subtractive_rng ( )

inline

Definition at line 420 of file _function.h.

{ _M_initialize(161803398ul); }

Member Function Documentation

_M_initialize()

void subtractive_rng::_M_initialize ( _STLP_UINT32_T  __seed )

inline

Definition at line 401 of file _function.h.

                                            {
    _STLP_UINT32_T __k = 1;
    _M_table[54] = __seed;
    _STLP_UINT32_T __i;
    for (__i = 0; __i < 54; __i++) {
        _STLP_UINT32_T __ii = (21 * (__i + 1) % 55) - 1;
        _M_table[__ii] = __k;
        __k = __seed - __k;
        __seed = _M_table[__ii];
    }
    for (int __loop = 0; __loop < 4; __loop++) {
        for (__i = 0; __i < 55; __i++)
            _M_table[__i] = _M_table[__i] - _M_table[(1 + __i + 30) % 55];
    }
    _M_index1 = 0;
    _M_index2 = 31;
  }

Referenced by subtractive_rng().

operator()()

_STLP_UINT32_T subtractive_rng::operator() ( _STLP_UINT32_T  __limit )

inline

Definition at line 394 of file _function.h.

                                                    {
    _M_index1 = (_M_index1 + 1) % 55;
    _M_index2 = (_M_index2 + 1) % 55;
    _M_table[_M_index1] = _M_table[_M_index1] - _M_table[_M_index2];
    return _M_table[_M_index1] % __limit;
  }

Member Data Documentation

_M_index1

_STLP_UINT32_T subtractive_rng::_M_index1

private

Definition at line 391 of file _function.h.

Referenced by _M_initialize(), and operator()().

_M_index2

_STLP_UINT32_T subtractive_rng::_M_index2

private

Definition at line 392 of file _function.h.

Referenced by _M_initialize(), and operator()().

_M_table

_STLP_UINT32_T subtractive_rng::_M_table[55]

private

Definition at line 390 of file _function.h.

Referenced by _M_initialize(), and operator()().

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The documentation for this class was generated from the following file:

• sdk/include/c++/stlport/stl/_function.h