Tests if type is volatile.
template<class Ty>
struct is_volatile;
Parameters
- Ty
The type to query.
Remarks
An instance of the type predicate holds true if Ty is volatile-qualified.
Example
// std_tr1__type_traits__is_volatile.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>
struct trivial
{
int val;
};
int main()
{
std::cout << "is_volatile<trivial> == " << std::boolalpha
<< std::is_volatile<trivial>::value << std::endl;
std::cout << "is_volatile<volatile trivial> == " << std::boolalpha
<< std::is_volatile<volatile trivial>::value << std::endl;
std::cout << "is_volatile<int> == " << std::boolalpha
<< std::is_volatile<int>::value << std::endl;
std::cout << "is_volatile<volatile int> == " << std::boolalpha
<< std::is_volatile<volatile int>::value << std::endl;
return (0);
}
is_volatile<trivial> == false is_volatile<volatile trivial> == true is_volatile<int> == false is_volatile<volatile int> == true
Requirements
Header: <type_traits>
Namespace: std