is_volatile template in C++

The std::is_volatile template of C++ STL is used to check whether the type is a volatile-qualified or not. It returns a boolean value showing the same.

Syntax:

template < class T > struct is_volatile;

Parameter: This template contains single parameter T (Trait class) to check whether T is a volatile-qualified type or not.



Return Value: This template returns a boolean value as shown below:

  • True: if the type is a volatile-qualified.
  • False: if the type is a non-volatile-qualified.

Below programs illustrate the std::is_volatile template in C++ STL:

Program 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// C++ program to illustrate
// std::is_volatile template
  
#include <iostream>
#include <type_traits>
using namespace std;
  
// main program
int main()
{
    cout << boolalpha;
    cout << "is_volatile:"
         << '\n';
    cout << "volatile int:"
         << is_volatile<volatile int>::value
         << '\n';
    cout << "volatile void:"
         << is_volatile<volatile void>::value
         << '\n';
    cout << "int:"
         << is_volatile<int>::value
         << '\n';
    cout << "char:"
         << is_volatile<char>::value
         << '\n';
  
    return 0;
}

chevron_right


Output:

is_volatile:
volatile int:true
volatile void:true
int:false
char:false

Program 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

// C++ program to illustrate
// std::is_volatile template
  
#include <iostream>
#include <type_traits>
using namespace std;
  
// main program
int main()
{
    cout << boolalpha;
    cout << "is_volatile:"
         << '\n';
    cout << "double:"
         << is_volatile<double>::value
         << '\n';
    cout << "float:"
         << is_volatile<float>::value
         << '\n';
    cout << "const volatile void:"
         << is_volatile<const volatile void>::value
         << '\n';
  
    return 0;
}

chevron_right


Output:

is_volatile:
double:false
float:false
const volatile void:true

Program 3:

filter_none

edit
close

play_arrow

link
brightness_4
code

// C++ program to illustrate
// std::is_volatile template
  
#include <iostream>
#include <type_traits>
using namespace std;
  
// main program
int main()
{
    cout << boolalpha;
    cout << "is_volatile:"
         << '\n';
    cout << "volatile double:"
         << is_volatile<volatile double>::value
         << '\n';
    cout << "volatile float:"
         << is_volatile<volatile float>::value
         << '\n';
    cout << "bool:"
         << is_volatile<bool>::value
         << '\n';
    cout << "volatile char:"
         << is_volatile<volatile char>::value
         << '\n';
  
    return 0;
}

chevron_right


Output:

is_volatile:
volatile double:true
volatile float:true
bool:false
volatile char:true


My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.




Article Tags :
Practice Tags :


Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.