基于Boost库生成随机数

#include <boost/random.hpp>#include <ctime>#include <iostream>#include <fstream>using namespace std;// 生成正态分布随机数double sampleNormal( double mean, double sigma ){    // 建立Mersenne twister随机数生成器    // 使用Unix时间设定seed    static boost::mt19937 rng( static_cast< unsigned >( std::time( 0 ) ) );    // 选择高斯随机分布    boost::normal_distribution< double > norm_dist( mean, sigma );    // 使用function的形式，生成随机数产生器    boost::variate_generator< boost::mt19937&, boost::normal_distribution< double > > normal_sampler( rng, norm_dist );    return normal_sampler( );}// 生成一定范围内的随机整数// 值域是[start, end]int sampleUniformInt( int start, int end ){    static boost::mt19937 rng( static_cast< unsigned >( std::time( 0 ) ) );    boost::uniform_int< > uni_dist( start, end );    return uni_dist( rng );}// 生成一定范围内的随机实数double sampleUniformDouble( double start, double end ){    static boost::mt19937 rng( static_cast< unsigned >( std::time( 0 ) ) );    boost::uniform_real< > uni_dist( start, end );    return uni_dist( rng );}#define DEMO_NORMAL_DIST 1#define DEMO_UNI_DIST_INT 0#define DEMO_UNI_DIST_DOUBLE 0int main( ){    // 正态分布样本输出#if DEMO_NORMAL_DIST    ofstream o_normal_distribution_file( "normal_distribution.txt" );#endif#if DEMO_UNI_DIST_INT    ofstream o_uni_distribution_int_file( "uni_distribution_int.txt" );#endif#if DEMO_UNI_DIST_DOUBLE    ofstream o_uni_distribution_double_file( "uni_distribution_double.txt" );#endif    while ( 1 )    {        // 正态分布测试#if DEMO_NORMAL_DIST        cout << sampleNormal( 10, 0.1 ) << endl;        o_normal_distribution_file << sampleNormal( 10, 0.1 ) << endl;#endif        // 整数均匀分布测试#if DEMO_UNI_DIST_INT        cout << sampleUniformInt( 0, 9 ) << endl;        o_uni_distribution_int_file << sampleUniformInt( 0, 9 ) << endl;#endif        // 实数均匀分布测试#if DEMO_UNI_DIST_DOUBLE        cout << sampleUniformDouble( 0, 1 ) << endl;        o_uni_distribution_double_file << sampleUniformDouble( 0, 1 ) << endl;#endif    }    return 0;}