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is_convertible Class


The latest version of this topic can be found at is_convertible Class.

Tests if one type is convertible to another.

template <class From, class To>  
struct is_convertible;  


The type to convert from.

The type to convert to.

An instance of the type predicate holds true if the expression To to = from;, where from is an object of type From, is well-formed.

// std_tr1__type_traits__is_convertible.cpp   
// compile with: /EHsc   
#include <type_traits>   
#include <iostream>   
struct trivial   
    int val;   
int main()   
    std::cout << "is_convertible<trivial, int> == " << std::boolalpha   
        << std::is_convertible<trivial, int>::value << std::endl;   
    std::cout << "is_convertible<trivial, trivial> == " << std::boolalpha   
        << std::is_convertible<trivial, trivial>::value << std::endl;   
    std::cout << "is_convertible<char, int> == " << std::boolalpha   
        << std::is_convertible<char, int>::value << std::endl;   
    return (0);   

is_convertible<trivial, int> == false  
is_convertible<trivial, trivial> == true  
is_convertible<char, int> == true  

Header: <type_traits>

Namespace: std

is_base_of Class