C++随机数生成器mt19937生成随机数的用法_c++ mt19937

#include <iostream>  
#include <chrono>  
#include <random>  
 
int main()
{
    // obtain a seed from the system clock:  
    unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
 
    std::mt19937 generator(seed);  // mt19937 is a standard mersenne_twister_engine  
    auto number = generator();//生成一个随机数
    std::cout << "Random value: " << number << std::endl;
 
    return 0;
}

输出：

Random value: 3878294182

下面的代码来自官方示例：

// mersenne_twister_engine constructor
#include <iostream>
#include <chrono>
#include <random>
#include <string>
 
using namespace std;
 
int main()
{
	// obtain a seed from the system clock:
	unsigned seed1 = std::chrono::system_clock::now().time_since_epoch().count();
 
	// obtain a seed from the user:
	std::string str;
	std::cout << "Please, enter a seed: ";
	std::getline(std::cin, str);
	std::seed_seq seed2(str.begin(), str.end());
 
	std::mt19937 g1(seed1);  // mt19937 is a standard mersenne_twister_engine
	std::cout << "A time seed produced: " << g1() << std::endl;
	std::cout << typeid(g1()).name() << endl;
	std::mt19937 g2(seed2);
	std::cout << "Your seed produced: " << g2() << std::endl;
 
	return 0;
}