std::meta::has_virtual_destructor

 

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Defined in header <meta>
consteval bool has_virtual_destructor( std::meta::info r );		(since C++26)

Returns true if r represents a type that has a virtual destructor. Otherwise returns false.

Parameters

r

-

a reflection value

Return value

true if r represents a type that has a virtual destructor; otherwise false.

Exceptions

Throws std::meta::exception if r does not represent a type or type alias.

Notes

If a class C has a public virtual destructor, it can be derived from, and the derived object can be safely deleted through a pointer to the base object (GotW #18). In this case, std::meta::is_polymorphic_type(^^C) is true.

Example

Run this code

#include <meta>

struct S {};
static_assert(not has_virtual_destructor(^^S));

struct B
{
    virtual ~B() {}
};
static_assert(has_virtual_destructor(^^B));

struct D : B
{
    ~D() {}
};
static_assert(has_virtual_destructor(^^D));

int main()
{
    B* pd = new D;
    delete pd;
}

See also

is_destructible_typeis_trivially_destructible_typeis_nothrow_destructible_type (C++26)(C++26)(C++26)	checks if reflected type has a non-deleted destructor (function)
is_polymorphic_type (C++26)	checks if reflected type is a polymorphic class type (function)
has_virtual_destructor (C++11)	checks if a type has a virtual destructor (class template)