公有成员函数 (public member function)
<random>
| (1) | explicit uniform_int_distribution ( result_type a = 0, result_type b = numeric_limits<result_type>::max() ); |
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| (2) | explicit uniform_int_distribution ( const param_type& parm ); |
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构造均匀离散分布 (Construct uniform discrete distribution)
参数
- a, b
- 分布可以生成的值的范围的上限和下限（[a,b]）。
请注意，范围同时包含 a 和 b（以及它们之间的所有整数值）。
b 应大于或等于 a（a<b）。
result_type是一个成员类型，表示每次调用 operator() 时生成的随机数的类型。它被定义为第一个类模板参数（IntType).
- parm
- 一个表示分布参数的对象，通过调用成员函数 param 获取。
param_type是一个成员类型。
示例
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// uniform_int_distribution example
#include <iostream>
#include <chrono>
#include <random>
int main()
{
// construct a trivial random generator engine from a time-based seed:
unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
std::default_random_engine generator (seed);
std::uniform_int_distribution<int> distribution(1,100);
int guess;
int number = distribution(generator);
while (true) {
std::cout << "guess the number (between 1 and 100): ";
std::cin >> guess;
if (number==guess) {std::cout << "right!\n"; break; }
else if (number>guess) std::cout << "it's greater\n";
else std::cout << "it's less\n";
}
return 0;
}
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可能的输出
guess the number (between 1 and 100): 50
it's greater
guess the number (between 1 and 100): 75
it's greater
guess the number (between 1 and 100): 87
it's less
guess the number (between 1 and 100): 81
it's less
guess the number (between 1 and 100): 78
it's less
guess the number (between 1 and 100): 76
right!
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