Random.h

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//
// Copyright (c) ZeroC, Inc. All rights reserved.
//
 
#ifndef ICE_UTIL_RANDOM_H
#define ICE_UTIL_RANDOM_H
 
#include <IceUtil/Config.h>
#include <IceUtil/Exception.h>
 
#ifdef ICE_CPP11_COMPILER
#   include <algorithm>
#   include <random>
#else
#   include <functional>
#endif
 
namespace IceUtilInternal
{
 
ICE_API void generateRandom(char*, size_t);
ICE_API unsigned int random(int = 0);
 
#ifdef ICE_CPP11_COMPILER
 
template<class T>
void shuffle(T first, T last)
{
    std::random_device rd;
    std::mt19937 rng(rd());
    std::shuffle(first, last, rng);
}
 
#else
 
struct RandomNumberGenerator : public std::unary_function<std::ptrdiff_t, std::ptrdiff_t>
{
    std::ptrdiff_t operator()(std::ptrdiff_t d)
    {
        return static_cast<std::ptrdiff_t>(IceUtilInternal::random(static_cast<int>(d)));
    }
};
 
template<class T>
void shuffle(T first, T last)
{
    RandomNumberGenerator rng;
    random_shuffle(first, last, rng);
}
 
#endif
 
}
 
#endif