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# std::is_convertible

From cppreference.com
< cpp‎ | types

Defined in header `<type_traits>` |  |
template< class From, class To > struct is_convertible; |  | (since C++11)

If an imaginary rvalue of type `From` can be 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.

## Inherited from std::integral_constant

### Member constants

value [static] | 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

Run this code

    #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

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