| Defined in header <type_traits> | ||||
|---|---|---|---|---|
| (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.
Helper variable template
| (since C++17) |
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) |
| operator() (C++14) | returns value (public member function) |
Member types
| Type | Definition |
|---|---|
value_type | bool |
type | std::integral_constant<bool, value> |
Possible implementation
|
Example
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 | #include <iostream>#include <type_traits>#include <cstdint> void print_separator(){ std::cout << "-----\n";} int main(){ std::cout << std::boolalpha; std::cout << std::is_same<int, int32_t>::value << '\n'; // true std::cout << std::is_same<int, int64_t>::value << '\n'; // false std::cout << std::is_same<float, int32_t>::value << '\n'; // false print_separator(); std::cout << std::is_same<int, int>::value << "\n"; // true std::cout << std::is_same<int, unsigned int>::value << "\n"; // false std::cout << std::is_same<int, signed int>::value << "\n"; // true print_separator(); // unlike other types 'char' is not 'unsigned' and not 'signed' std::cout << std::is_same<char, char>::value << "\n"; // true std::cout << std::is_same<char, unsigned char>::value << "\n"; // false std::cout << std::is_same<char, signed char>::value << "\n"; // false} |
Output:
1 2 3 4 5 6 7 8 9 10 11 | truefalsefalse-----truefalsetrue-----truefalsefalse |
See also
| (C++11) | checks if a type is integral type (class template) |
| (C++11) | makes the given integral type signed (class template) |
| (C++11) | makes the given integral type unsigned (class template) |
| std::experimental::is_same_v
(library fundamentals TS) | variable template alias of std::is_same::value (variable template) |
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