<type_traits> typedefs

The latest version of this topic can be found at <type_traits> typedefs.

false_type Typedef

Holds integral constant with false value.

typedef integral_constant<bool, false> false_type;  

Remarks

The type is a synonym for a specialization of the template integral_constant.

Example

#include <type_traits>   
#include <iostream>   
  
int main()   
    {   
    std::cout << "false_type == " << std::boolalpha   
        << std::false_type::value << std::endl;   
    std::cout << "true_type == " << std::boolalpha   
        << std::true_type::value << std::endl;   
  
    return (0);   
    }  
  

false_type == false  
true_type == true  

true_type Typedef

Holds integral constant with true value.

typedef integral_constant<bool, true> true_type;  

Remarks

The type is a synonym for a specialization of the template integral_constant.

Example

// std_tr1__type_traits__true_type.cpp   
// compile with: /EHsc   
#include <type_traits>   
#include <iostream>   
  
int main()   
    {   
    std::cout << "false_type == " << std::boolalpha   
        << std::false_type::value << std::endl;   
    std::cout << "true_type == " << std::boolalpha   
        << std::true_type::value << std::endl;   
  
    return (0);   
    }  
  

false_type == false  
true_type == true  

See Also

<type_traits>