has_trivial_destructor Class
Tests if type has trivial destructor.
template<class Ty>
struct has_trivial_destructor;
Parameters
- Ty
The type to query.
Remarks
An instance of the type predicate holds true if the type Ty is a class that has a trivial destructor, otherwise it holds false.
A destructor for a class Ty is trivial if:
it is an implicitly declared destructor
all the direct bases of the class Ty have trivial destructors
the classes of all the non-static data members of class type have trivial destructors
the classes of all the non-static data members of type array of class have trivial destructors
Example
// std_tr1__type_traits__has_trivial_destructor.cpp
// compile with: /EHsc
#include <type_traits>
#include <iostream>
struct trivial
{
int val;
};
struct throws
{
throws() throw(int)
{
}
throws(const throws&) throw(int)
{
}
throws& operator=(const throws&) throw(int)
{
}
~throws()
{
}
int val;
};
int main()
{
std::cout << "has_trivial_destructor<trivial> == " << std::boolalpha
<< std::has_trivial_destructor<trivial>::value << std::endl;
std::cout << "has_trivial_destructor<throws> == " << std::boolalpha
<< std::has_trivial_destructor<throws>::value << std::endl;
return (0);
}
has_trivial_destructor<trivial> == true has_trivial_destructor<throws> == false
Requirements
Header: <type_traits>
Namespace: std