< type_traits >头文件中提供了C++ STL的std :: add_volatile模板。 C++ STL的std :: add_volatile模板用于获取具有易失性限定的T类型。函数std :: is_volatile用于检查类型T是否为volatile限定。
头文件:
#include
模板类别:
template < class T >
struct add_volatile;
句法:
std::add_volatile::value
参数:模板std :: add_volatile接受单个参数T(Trait类) ,该参数用于获取具有volatile限定的T类型。
下面是演示C++中std :: add_volatile:的程序:
程序:
// C++ program to illustrate
// std::add_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 add_volatile::type C;
typedef add_volatile::type D;
typedef add_volatile::type E;
cout << boolalpha;
// Checking the volatileness of
// the above declared variable
cout << "checking 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 volatileness:
A: true
B: true
C: true
D: true
E: false
参考: http : //www.cplusplus.com/reference/type_traits/add_volatile/
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