109e2ca434
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64589 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
/////////////////////////////////////////////////////////////////////////////
|
|
// Name: wx/meta/pod.h
|
|
// Purpose: Test if a type is POD
|
|
// Author: Vaclav Slavik, Jaakko Salli
|
|
// Created: 2010-06-14
|
|
// RCS-ID: $Id$
|
|
// Copyright: (c) wxWidgets team
|
|
// Licence: wxWindows licence
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef _WX_META_POD_H_
|
|
#define _WX_META_POD_H_
|
|
|
|
#include "wx/defs.h"
|
|
|
|
//
|
|
// TODO: Use TR1 is_pod<> implementation where available. VC9 SP1 has it
|
|
// in tr1 namespace, VC10 has it in std namespace. GCC 4.2 has it in
|
|
// <tr1/type_traits>, while GCC 4.3 and later have it in <type_traits>.
|
|
//
|
|
|
|
// This macro declares something called "value" inside a class declaration.
|
|
//
|
|
// It has to be used because VC6 doesn't handle initialization of the static
|
|
// variables in the class declaration itself while BCC5.82 doesn't understand
|
|
// enums (it compiles the template fine but can't use it later)
|
|
#if defined(__VISUALC__) && !wxCHECK_VISUALC_VERSION(7)
|
|
#define wxDEFINE_TEMPLATE_BOOL_VALUE(val) enum { value = val }
|
|
#else
|
|
#define wxDEFINE_TEMPLATE_BOOL_VALUE(val) static const bool value = val
|
|
#endif
|
|
|
|
// Helper to decide if an object of type T is POD (Plain Old Data)
|
|
template<typename T>
|
|
struct wxIsPod
|
|
{
|
|
wxDEFINE_TEMPLATE_BOOL_VALUE(false);
|
|
};
|
|
|
|
// Macro to add wxIsPod<T> specialization for given type that marks it
|
|
// as Plain Old Data:
|
|
#define WX_DECLARE_TYPE_POD(type) \
|
|
template<> struct wxIsPod<type> \
|
|
{ \
|
|
wxDEFINE_TEMPLATE_BOOL_VALUE(true); \
|
|
};
|
|
|
|
WX_DECLARE_TYPE_POD(bool)
|
|
WX_DECLARE_TYPE_POD(unsigned char)
|
|
WX_DECLARE_TYPE_POD(signed char)
|
|
WX_DECLARE_TYPE_POD(unsigned int)
|
|
WX_DECLARE_TYPE_POD(signed int)
|
|
WX_DECLARE_TYPE_POD(unsigned short int)
|
|
WX_DECLARE_TYPE_POD(signed short int)
|
|
WX_DECLARE_TYPE_POD(signed long int)
|
|
WX_DECLARE_TYPE_POD(unsigned long int)
|
|
WX_DECLARE_TYPE_POD(float)
|
|
WX_DECLARE_TYPE_POD(double)
|
|
WX_DECLARE_TYPE_POD(long double)
|
|
#if wxWCHAR_T_IS_REAL_TYPE
|
|
WX_DECLARE_TYPE_POD(wchar_t)
|
|
#endif
|
|
#ifdef wxLongLong_t
|
|
WX_DECLARE_TYPE_POD(wxLongLong_t)
|
|
WX_DECLARE_TYPE_POD(wxULongLong_t)
|
|
#endif
|
|
|
|
// Visual C++ 6.0 can't compile partial template specializations and as this is
|
|
// only an optimization, we can live with pointers not being recognized as
|
|
// POD types under VC6
|
|
#if !defined(__VISUALC__) || wxCHECK_VISUALC_VERSION(7)
|
|
|
|
// pointers are Plain Old Data:
|
|
template<typename T>
|
|
struct wxIsPod<T*>
|
|
{
|
|
static const bool value = true;
|
|
};
|
|
|
|
template<typename T>
|
|
struct wxIsPod<const T*>
|
|
{
|
|
static const bool value = true;
|
|
};
|
|
|
|
#endif // !VC++ < 7
|
|
|
|
#endif // _WX_META_POD_H_
|