class template
<type_traits>

std::is_rvalue_reference

template <class T> struct is_rvalue_reference;
Is rvalue reference

Trait class that identifies whether T is an r-value reference.

It inherits from integral_constant as being either true_type or false_type.

Template parameters

T
A type.

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_rvalue_reference example
#include <iostream>
#include <type_traits>

int main() {
  std::cout << std::boolalpha;
  std::cout << "is_rvalue_reference:" << std::endl;
  std::cout << "int: " << std::is_rvalue_reference<int>::value << std::endl;
  std::cout << "int&: " << std::is_rvalue_reference<int&>::value << std::endl;
  std::cout << "int&&: " << std::is_rvalue_reference<int&&>::value << std::endl;
  return 0;
}


Output:
is_rvalue_reference:
int: false
int&: false
int&&: true

See also

<type_traits>