<type_traits>

class template
<type_traits>

std::is_convertible

template <class From, class To> struct is_convertible;
Is convertible

Trait class that identifies whether From is implicitly convertible to To.

The class inherits from integral_constant as being either true_type or false_type, depending on whether T supports being assigned U.


Template parameters

From, To
Complete types, or void (possible cv-qualified), or an array of unknown bound.

Member types

Inherited from integral_constant:
member typedefinition
value_typebool
typeeither true_type or false_type

Member constants

Inherited from integral_constant:
member constantdefinition
valueeither true or false

Member functions

Inherited from integral_constant:

Example

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// is_convertible example
#include <iostream>
#include <type_traits>

struct A { };
struct B : A { };

int main() {
  std::cout << std::boolalpha;
  std::cout << "is_convertible:" << std::endl;
  std::cout << "int => float: " << std::is_convertible<int,float>::value << std::endl;
  std::cout << "int = >const int: " << std::is_convertible<int,const int>::value << std::endl;
  std::cout << "A => B: " << std::is_convertible<A,B>::value << std::endl;
  std::cout << "B => A: " << std::is_convertible<B,A>::value << std::endl;
  return 0;
}

Output:
is_convertible:
int => float: true
int => const int: true
A => B: false
B => A: true


See also