C++中的std :: remove_volatile与示例

头文件中提供了C++ STL的std :: remove_volatile模板。 C++ STL的std :: remove_volatile模板用于获取T，而不使用volatile限定。如果T不具有volatile限定，则返回布尔值true，否则返回false。以下是相同的语法：

头文件：

#include

模板类别：

template 
struct remove_volatile;

句法：

std::remove_volatile::value

参数：模板std :: rmeove_volatile接受单个参数T(Trait类)，以检查T是否不具有volatile限定。

返回值：模板std :: remove_volatile返回一个布尔值：

• 正确：如果T型没有挥发性限定。
• False：如果T类型具有挥发性限定。

下面是演示C++中std :: remove_volatile的程序：

程序1：

// C++ program to illustrate
// std::remove_volatile
#include 
#include 
using namespace std;
  
// Driver Code
int main()
{
  
    // Declare variable of type
    // volatile (int, const int, const int*,
    // int * const and const int&)
    typedef remove_volatile::type A;
    typedef remove_volatile::type B;
    typedef remove_volatile::type C;
    typedef remove_volatile::type D;
    typedef remove_volatile::type E;
  
    cout << boolalpha;
  
    // Checking the non-volatileness
    // of the above declared variable
    cout << "checking Non-volatileness:"
         << endl;
  
    cout << "A: "
         << is_volatile::value
         << endl;
  
    cout << "B: "
         << is_volatile::value
         << endl;
  
    cout << "C: "
         << is_volatile::value
         << endl;
  
    cout << "D: "
         << is_volatile::value
         << endl;
  
    cout << "E: "
         << is_volatile::value
         << endl;
  
    return 0;
}

输出：

checking Non-volatileness:
A: false
B: false
C: false
D: false
E: false

程式2：

// C++ program to illustrate
// std::remove_volatile
#include 
#include 
using namespace std;
  
// Driver Code
int main()
{
  
    // Declare variable of type
    // volatile (int, const int, const int*,
    // int * const and const int&)
    typedef add_volatile::type A;
    typedef add_volatile::type B;
    typedef remove_cv::type a;
    typedef remove_cv::type b;
    typedef remove_cv::type c;
  
    cout << boolalpha;
  
    // Checking the non-volatileness
    // of the above declared variable
    cout << "checking Non-volatileness:"
         << endl;
  
    cout << "A: "
         << is_volatile::value
         << endl;
  
    cout << "B: "
         << is_volatile::value
         << endl;
  
    cout << "C: "
         << is_volatile::value
         << endl;
  
    cout << "D: "
         << is_volatile::value
         << endl;
  
    cout << "E: "
         << is_volatile::value
         << endl;
  
    return 0;
}

输出：

checking Non-volatileness:
A: true
B: true
C: false
D: false
E: false

参考： http://www.cplusplus.com/reference/type_traits/remove_volatile/

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