std::is_convertible
From Cppreference
Defined in header <type_traits>
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template< class From, class To >
struct is_convertible; |
(C++11 feature) | |
If an imaginary rvalue of type From can used in the return statement of a function returning To, that is, if it can be converted to To using implicit conversion, provides the member constant value equal to true. Otherwise value is false.
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Inherited from std::integral_constant
Member constants
value | true if From is convertible to To , 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] Notes
Gives well-defined results for reference types, void types, array types, and function types.
[edit] Example
#include <iostream> #include <type_traits> int main() { class A {}; class B: public A {}; class C {}; bool b2a = std::is_convertible<B*, A*>::value; bool a2b = std::is_convertible<A*, B*>::value; bool b2c = std::is_convertible<B*, C*>::value; std::cout << std::boolalpha; std::cout << b2a << '\n'; std::cout << a2b << '\n'; std::cout << b2c << '\n'; }
Output:
true false false