28f0592cd9
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51443 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
/////////////////////////////////////////////////////////////////////////////
|
|
// Name: wx/meta/movable.h
|
|
// Purpose: Test if a type is movable using memmove() etc.
|
|
// Author: Vaclav Slavik
|
|
// Created: 2008-01-21
|
|
// RCS-ID: $Id$
|
|
// Copyright: (c) 2008 Vaclav Slavik
|
|
// Licence: wxWindows licence
|
|
/////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef _WX_META_MOVABLE_H_
|
|
#define _WX_META_MOVABLE_H_
|
|
|
|
#include "wx/defs.h"
|
|
#include "wx/string.h" // for wxIsMovable<wxString> specialization
|
|
|
|
// 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
|
|
// movable.
|
|
template<typename T>
|
|
struct wxIsMovable
|
|
{
|
|
// NB: enum, because VC6 can't handle "static const bool value = true;"
|
|
enum { value = false };
|
|
};
|
|
|
|
// Macro to add wxIsMovable<T> specialization for given type that marks it
|
|
// as movable:
|
|
#define WX_DECLARE_TYPE_MOVABLE(type) \
|
|
template<> struct wxIsMovable<type> \
|
|
{ \
|
|
enum { 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
|
|
#ifndef __VISUALC6__
|
|
|
|
// pointers are movable:
|
|
template<typename T>
|
|
struct wxIsMovable<T*>
|
|
{
|
|
enum { value = true };
|
|
};
|
|
template<typename T>
|
|
struct wxIsMovable<const T*>
|
|
{
|
|
enum { value = true };
|
|
};
|
|
|
|
#endif // !__VISUALC6__
|
|
|
|
// Our implementation of wxString is written in such way that it's safe to move
|
|
// it around. OTOH, we don't know anything about std::string.
|
|
// (NB: we don't put this into string.h and choose to include wx/string.h from
|
|
// here instead so that rarely-used wxIsMovable<T> code isn't included by
|
|
// everything)
|
|
#if !wxUSE_STL
|
|
WX_DECLARE_TYPE_MOVABLE(wxString)
|
|
#endif
|
|
|
|
|
|
#endif // _WX_META_MOVABLE_H_
|