89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
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/////////////////////////////////////////////////////////////////////////////
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// Name: wx/meta/pod.h
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// Purpose: Test if a type is POD
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// Author: Vaclav Slavik, Jaakko Salli
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// Created: 2010-06-14
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// RCS-ID: $Id: pod.h 64589 2010-06-14 15:12:37Z JMS $
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// Copyright: (c) wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_META_POD_H_
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#define _WX_META_POD_H_
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#include "wx/defs.h"
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//
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// TODO: Use TR1 is_pod<> implementation where available. VC9 SP1 has it
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// in tr1 namespace, VC10 has it in std namespace. GCC 4.2 has it in
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// <tr1/type_traits>, while GCC 4.3 and later have it in <type_traits>.
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//
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// This macro declares something called "value" inside a class declaration.
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//
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// It has to be used because VC6 doesn't handle initialization of the static
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// variables in the class declaration itself while BCC5.82 doesn't understand
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// enums (it compiles the template fine but can't use it later)
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#if defined(__VISUALC__) && !wxCHECK_VISUALC_VERSION(7)
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#define wxDEFINE_TEMPLATE_BOOL_VALUE(val) enum { value = val }
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#else
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#define wxDEFINE_TEMPLATE_BOOL_VALUE(val) static const bool value = val
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#endif
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// Helper to decide if an object of type T is POD (Plain Old Data)
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template<typename T>
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struct wxIsPod
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{
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wxDEFINE_TEMPLATE_BOOL_VALUE(false);
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};
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// Macro to add wxIsPod<T> specialization for given type that marks it
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// as Plain Old Data:
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#define WX_DECLARE_TYPE_POD(type) \
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template<> struct wxIsPod<type> \
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{ \
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wxDEFINE_TEMPLATE_BOOL_VALUE(true); \
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};
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WX_DECLARE_TYPE_POD(bool)
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WX_DECLARE_TYPE_POD(unsigned char)
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WX_DECLARE_TYPE_POD(signed char)
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WX_DECLARE_TYPE_POD(unsigned int)
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WX_DECLARE_TYPE_POD(signed int)
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WX_DECLARE_TYPE_POD(unsigned short int)
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WX_DECLARE_TYPE_POD(signed short int)
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WX_DECLARE_TYPE_POD(signed long int)
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WX_DECLARE_TYPE_POD(unsigned long int)
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WX_DECLARE_TYPE_POD(float)
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WX_DECLARE_TYPE_POD(double)
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WX_DECLARE_TYPE_POD(long double)
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#if wxWCHAR_T_IS_REAL_TYPE
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WX_DECLARE_TYPE_POD(wchar_t)
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#endif
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#ifdef wxLongLong_t
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WX_DECLARE_TYPE_POD(wxLongLong_t)
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WX_DECLARE_TYPE_POD(wxULongLong_t)
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#endif
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// Visual C++ 6.0 can't compile partial template specializations and as this is
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// only an optimization, we can live with pointers not being recognized as
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// POD types under VC6
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#if !defined(__VISUALC__) || wxCHECK_VISUALC_VERSION(7)
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// pointers are Plain Old Data:
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template<typename T>
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struct wxIsPod<T*>
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{
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static const bool value = true;
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};
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template<typename T>
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struct wxIsPod<const T*>
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{
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static const bool value = true;
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};
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#endif // !VC++ < 7
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#endif // _WX_META_POD_H_
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