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u>_I|+ ? // random number generation -*- C++ -*-
// Copyright (C) 2009-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// .
/**
* @file tr1/random.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{tr1/random}
*/
#ifndef _GLIBCXX_TR1_RANDOM_H
#define _GLIBCXX_TR1_RANDOM_H 1
#pragma GCC system_header
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
namespace tr1
{
// [5.1] Random number generation
/**
* @addtogroup tr1_random Random Number Generation
* A facility for generating random numbers on selected distributions.
* @{
*/
/*
* Implementation-space details.
*/
namespace __detail
{
template::digits>
struct _Shift
{ static const _UIntType __value = 0; };
template
struct _Shift<_UIntType, __w, true>
{ static const _UIntType __value = _UIntType(1) << __w; };
template
struct _Mod;
// Dispatch based on modulus value to prevent divide-by-zero compile-time
// errors when m == 0.
template
inline _Tp
__mod(_Tp __x)
{ return _Mod<_Tp, __a, __c, __m, __m == 0>::__calc(__x); }
typedef __gnu_cxx::__conditional_type<(sizeof(unsigned) == 4),
unsigned, unsigned long>::__type _UInt32Type;
/*
* An adaptor class for converting the output of any Generator into
* the input for a specific Distribution.
*/
template
struct _Adaptor
{
typedef typename remove_reference<_Engine>::type _BEngine;
typedef typename _BEngine::result_type _Engine_result_type;
typedef typename _Distribution::input_type result_type;
public:
_Adaptor(const _Engine& __g)
: _M_g(__g) { }
result_type
min() const
{
result_type __return_value;
if (is_integral<_Engine_result_type>::value
&& is_integral::value)
__return_value = _M_g.min();
else
__return_value = result_type(0);
return __return_value;
}
result_type
max() const
{
result_type __return_value;
if (is_integral<_Engine_result_type>::value
&& is_integral::value)
__return_value = _M_g.max();
else if (!is_integral::value)
__return_value = result_type(1);
else
__return_value = std::numeric_limits::max() - 1;
return __return_value;
}
/*
* Converts a value generated by the adapted random number generator
* into a value in the input domain for the dependent random number
* distribution.
*
* Because the type traits are compile time constants only the
* appropriate clause of the if statements will