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std::bitset::test

STD：：位集：：测试

bool test( size_t pos ) const;​​

返回位置处位的值。pos...

不像operator[]，执行边界检查并抛出std::out_of_range如果pos不对应于位集中的有效位置。

参数

pos-position of the bit to return

返回值

true如果设置了所请求的位，false否则。

例外

std::out_of_range如果pos不对应于位集中的有效位置。

例

二次

#include <iostream>
#include <bitset>
 
int main() 
{
    std::bitset<10> b1("1111010000"
 
    size_t idx = 0;
    while (idx < b1.size() && !b1.test(idx)) {
      ++idx;
    }
 
    if (idx < b1.size()) {
        std::cout << "first set bit at index " << idx << '\n';
    } else {
        std::cout << "no set bits\n";
    }
}

二次

产出：

二次

first set bit at index 4

二次

另见

operator[]accesses specific bit (public member function)

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