template <class T> struct is_pod : public
POD stands for "Plain old data". Arithmetic types, and enumeration types, a pointers and pointer to members are all PODs. Classes and unions can also be POD's if they have no non-static data members that are of reference or non-POD type, no user defined constructors, no user defined assignment operators, no private or protected non-static data members, no virtual functions and no base classes. Finally, a cv-qualified POD is still a POD, as is an array of PODs.
C++ Standard Reference: 3.9p10 and 9p4 (Note that POD's are also aggregates, see 8.5.1).
Compiler Compatibility: If the compiler does not support partial-specialization of class templates, then this template can not be used with function types.
Without some (as yet unspecified) help from the compiler, ispod will never report that a class or struct is a POD; this is always safe, if possibly sub-optimal. Currently (May 2005) only MWCW 9 and Visual C++ 8 have the necessary compiler-_intrinsics.
is_pod<char*>::typeis the type
is_pod<int (*)(long)>::valueis an integral constant expression that evaluates to true.
is_pod<MyClass>::valueis an integral constant expression that evaluates to false.
is_pod<T>::value_typeis the type