std::is_same
From cppreference.com
| Defined in header <type_traits>
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| template< class T, class U > struct is_same; |
(since C++11) | |
If T and U name the same type with the same const-volatile qualifications, provides the member constant value equal to true. Otherwise value is false.
Contents |
Inherited from std::integral_constant
Member constants
| value [static] |
true if T and U is the same type , false otherwise (public static member constant) |
Member functions
| operator bool |
converts the object to bool, returns value (public member function) |
Member types
| Type | Definition |
| value_type | bool |
| type | std::integral_constant<bool, value> |
[edit] Possible implementation
template<class T, class U> struct is_same : std::false_type {}; template<class T> struct is_same<T, T> : std::true_type {}; |
[edit] Example
#include <iostream> #include <type_traits> #include <cstdint> int main() { std::cout << std::boolalpha; std::cout << std::is_same<int, int32_t>::value << '\n'; std::cout << std::is_same<int, int64_t>::value << '\n'; std::cout << std::is_same<float, int32_t>::value << '\n'; }
Output:
true false false
