| description | Learn more about: is_const Class | ||
|---|---|---|---|
| title | is_const Class | ||
| ms.date | 11/04/2016 | ||
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| ms.assetid | 55b8e887-9c3f-4a1d-823a-4a257337b205 |
Tests if type is const.
template <class Ty>
struct is_const;Ty
The type to query.
An instance of the type predicate holds true if Ty is const-qualified.
// std__type_traits__is_const.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>
struct trivial
{
int val;
};
int main()
{
std::cout << "is_const<trivial> == " << std::boolalpha
<< std::is_const<trivial>::value << std::endl;
std::cout << "is_const<const trivial> == " << std::boolalpha
<< std::is_const<const trivial>::value << std::endl;
std::cout << "is_const<int> == " << std::boolalpha
<< std::is_const<int>::value << std::endl;
std::cout << "is_const<const int> == " << std::boolalpha
<< std::is_const<const int>::value << std::endl;
return (0);
}is_const<trivial> == false
is_const<const trivial> == true
is_const<int> == false
is_const<const int> == true
Header: <type_traits>
Namespace: std