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std::bitset::count

STD：：位集：：计数

std::size_t count() const;​​

返回设置为true...

参数

%280%29

返回值

设置为true...

例外

(none)(until C++11)
noexcept specification: noexcept(since C++11)

例

二次

#include <iostream>
#include <bitset>
 
int main()
{
    std::bitset<8> b("00010010"
    std::cout << "initial value: " << b << '\n';
 
    // find the first unset bit
    size_t idx = 0;
    while (idx < b.size() && b.test(idx)) ++idx;
 
    // continue setting bits until half the bitset is filled
    while (idx < b.size() && b.count() < b.size()/2) {
        b.set(idx
        std::cout << "setting bit " << idx << ": " << b << '\n';
        while (idx < b.size() && b.test(idx)) ++idx;
    }
 
}

二次

产出：

二次

initial value: 00010010
setting bit 0: 00010011
setting bit 2: 00010111

二次

另见

sizereturns the size number of bits that the bitset can hold (public member function)

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