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std::is_volatile

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Revision as of 15:52, 1 July 2013 by P12bot (Talk | contribs)

 
 
 
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is_volatile
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Defined in header <type_traits>
template< class T >
struct is_volatile;
(since C++11)

If T is a volatile-qualified type (that is, volatile, or const volatile), provides the member constant value equal true. For any other type, value is false.

Contents

Inherited from std::integral_constant

Member constants

value
[static]
true if T is a volatile-qualified type , false otherwise
(public static member constant)

Member functions

operator bool
converts the object to bool, returns value
(public member function)
operator()
(C++14)
returns value
(public member function)

Member types

Type Definition
value_type bool
type std::integral_constant<bool, value>
[edit template]

Possible implementation

template<class T> struct is_volatile             : std::false_type {};
template<class T> struct is_volatile<volatile T> : std::true_type {};

Example

#include <iostream>
#include <type_traits>
 
int main() 
{
    std::cout << boolalpha;
    std::cout << std::is_volatile<int>::value << '\n';
    std::cout << std::is_volatile<volatile int>::value  << '\n';
}

Output:

false
true

See also

(C++11)
checks if a type is const-qualified
(class template) [edit]