2 Copyright 2007 John Maddock.
3 Distributed under the Boost Software License, Version 1.0.
4 (See accompanying file LICENSE_1_0.txt or copy at
5 http://www.boost.org/LICENSE_1_0.txt).
8 [section:is_pod is_pod]
10 struct is_pod : public __tof {};
12 __inherit If T is a (possibly cv-qualified) POD type then inherits from __true_type,
13 otherwise inherits from __false_type.
15 POD stands for "Plain old data".
16 Arithmetic types, and enumeration types,
17 a pointers and pointer to members are all PODs. Classes and unions can also
18 be POD's if they have no non-static data members that are of reference or
19 non-POD type, no user defined constructors, no user defined assignment
20 operators, no private or protected non-static data members,
21 no virtual functions and no base classes. Finally, a cv-qualified POD is
22 still a POD, as is an array of PODs.
24 __std_ref 3.9p10 and 9p4 (Note that POD's are also aggregates, see 8.5.1).
26 __compat Without some (as yet unspecified) help from the compiler, is_pod will
27 never report that a class or struct is a POD; this is always safe,
28 if possibly sub-optimal.
29 Currently (June 2015) compilers more recent than Visual C++ 8, Clang-3, GCC-4.3, Greenhills 6.0,
30 Intel-11.0, and Codegear have the necessary compiler __intrinsics to ensure that this
31 trait "just works". You may also test to see if the necessary __intrinsics are available
32 by checking to see if the macro `BOOST_IS_POD` is defined.
35 __header ` #include <boost/type_traits/is_pod.hpp>` or ` #include <boost/type_traits.hpp>`
39 [:`is_pod<int>` inherits from `__true_type`.]
41 [:`is_pod<char*>::type` is the type `__true_type`.]
43 [:`is_pod<int (*)(long)>::value` is an integral constant
44 expression that evaluates to /true/.]
46 [:`is_pod<MyClass>::value` is an integral constant
47 expression that evaluates to /false/.]
49 [:`is_pod<T>::value_type` is the type `bool`.]