template <class T> struct has_virtual_destructor : public
Compiler Compatibility: This trait is provided for completeness, since it's part of the Technical Report on C++ Library Extensions. However, there is currently no way to portably implement this trait. The default version provided always inherits from false_type, and has to be explicitly specialized for types with virtual destructors unless the compiler used has compiler intrinsics that enable the trait to do the right thing: currently (May 2005) only Visual C++ 8 has the necessary intrinsics.
C++ Standard Reference: 12.4.