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Added wxIsPod<>. Use it in wxAny instead of wxIsMovable<>.

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@64589 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Jaakko Salli
2010-06-14 15:12:37 +00:00
parent 97b8472b54
commit 109e2ca434
24 changed files with 236 additions and 69 deletions
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55
include/wx/meta/movable.h
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@@ -11,20 +11,9 @@
#ifndef _WX_META_MOVABLE_H_
#define _WX_META_MOVABLE_H_
#include "wx/defs.h"
#include "wx/meta/pod.h"
#include "wx/string.h" // for wxIsMovable<wxString> specialization
// 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 "movable", i.e. if it can be
// copied to another memory location using memmove() or realloc() C functions.
// C++ only gurantees that POD types (including primitive types) are
@@ -32,7 +21,7 @@
template<typename T>
struct wxIsMovable
{
wxDEFINE_TEMPLATE_BOOL_VALUE(false);
wxDEFINE_TEMPLATE_BOOL_VALUE(wxIsPod<T>::value);
};
// Macro to add wxIsMovable<T> specialization for given type that marks it
@@ -43,46 +32,6 @@ struct wxIsMovable
wxDEFINE_TEMPLATE_BOOL_VALUE(true); \
};
WX_DECLARE_TYPE_MOVABLE(bool)
WX_DECLARE_TYPE_MOVABLE(unsigned char)
WX_DECLARE_TYPE_MOVABLE(signed char)
WX_DECLARE_TYPE_MOVABLE(unsigned int)
WX_DECLARE_TYPE_MOVABLE(signed int)
WX_DECLARE_TYPE_MOVABLE(unsigned short int)
WX_DECLARE_TYPE_MOVABLE(signed short int)
WX_DECLARE_TYPE_MOVABLE(signed long int)
WX_DECLARE_TYPE_MOVABLE(unsigned long int)
WX_DECLARE_TYPE_MOVABLE(float)
WX_DECLARE_TYPE_MOVABLE(double)
WX_DECLARE_TYPE_MOVABLE(long double)
#if wxWCHAR_T_IS_REAL_TYPE
WX_DECLARE_TYPE_MOVABLE(wchar_t)
#endif
#ifdef wxLongLong_t
WX_DECLARE_TYPE_MOVABLE(wxLongLong_t)
WX_DECLARE_TYPE_MOVABLE(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
// movable types under VC6
#if !defined(__VISUALC__) || wxCHECK_VISUALC_VERSION(7)
// pointers are movable:
template<typename T>
struct wxIsMovable<T*>
{
static const bool value = true;
};
template<typename T>
struct wxIsMovable<const T*>
{
static const bool value = true;
};
#endif // !VC++ < 7
// Our implementation of wxString is written in such way that it's safe to move
// it around (unless position cache is used which unfortunately breaks this).
// OTOH, we don't know anything about std::string.