C++ std::bit_or用法及代码示例

bit_or是C++中的内置函数，用于执行bitwise_or并在对其参数应用bitwise_or操作后返回结果。

头文件：

#include <functional.h>

模板类别：

template <class T> struct bit_or;

参数：它接受参数T，它是函数调用要比较的参数的类型。

Note:

此类的对象可用于标准算法，例如变换或累加。
成员函数('operator()')返回其参数的bitwise_or。

我们必须包括库‘functional’和‘algorithm’才能分别使用bit_or和transform()。

下面是C++中bit_or的图示：

问题一：

// C++ program to show the 
// functionality of bit_or 
  
#include <algorithm> // to include transform 
#include <functional> // to include bit_or 
#include <iostream> 
#include <iterator> 
using namespace std; 
  
int main() 
{ 
    // declaring the values 
    int xyz[] = { -7, 2, 5, 100, 1029 }; 
    int abc[] = { -4, 0, 5, 1, 1 }; 
    int n = 5; 
    // defining results 
    int results[n]; 
  
    // transform is used to apply 
    // bitwise_or on the arguments 
    transform(xyz, end(xyz), abc, 
              results, bit_or<int>()); 
  
    // printing the resulting array 
    cout << "Results:"; 
    for (const int& x:results) 
        cout << ' ' << x; 
  
    return 0; 
}

输出：

Results:-3 2 5 101 1029

Some points to Remember

Bitwise_or of a number with zero results into the number itself.

Bitwise_or of two same numbers is also equal to that number itself

If the number is odd it’s bit_or with 1 will result into same number

If the number is even it’s bit_or with 1 will always results into “number+1”

问题2：

// C++ program to show the 
// functionality of bit_or 
  
#include <algorithm> 
#include <functional> 
#include <iostream> 
#include <iterator> 
using namespace std; 
  
int main() 
{ 
    // declaring the values 
    // in form of hexadecimals 
    int xyz[] = { 0, 1100 }; 
    int abc[] = { 0xf, 0xf }; 
  
    // defining results 
    int results[2]; 
  
    // transform is used to apply 
    // bitwise_or on the arguments 
    transform(xyz, end(xyz), abc, 
              results, bit_or<int>()); 
  
    // printing the resulting array 
    cout << "Results:"; 
    for (const int& x:results) 
        cout << ' ' << x; 
  
    return 0; 
}

输出：

Results:15 1103

参考： https://en.cppreference.com/w/cpp/utility/functional/bit_or

相关用法

注：本文由纯净天空筛选整理自karan_gandhi大神的英文原创作品 std::bit_or in C++ with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。