public member function (公共成員函式)
<random>
result_type operator()();
生成隨機數
Returns a new random number. (返回一個新的隨機數。)
The function advances the internal state by calling its transition algorithm which applies a subtract-with-carry operation on the state sequence element. (該函式透過呼叫其 *轉換演算法* 來推進內部狀態,該演算法對狀態序列元素應用減法進位運算。)
Its generation algorithm is a direct copy of the value generated with the transition algorithm. (它的 *生成演算法* 是使用 *轉換演算法* 生成的值的直接副本。)
返回值
A new random number. (一個新的隨機數。)
result_type (結果型別)是一個成員型別,定義為第一個類模板引數的別名 (UIntType).
示例
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// subtract_with_carry::operator()
#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::subtract_with_carry_engine<unsigned,24,10,24> generator (seed);
std::cout << "Random value: " << generator() << std::endl;
return 0;
}
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可能的輸出
複雜度
Amortized constant. (分攤常數。)