45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/meta/movable.h
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// Purpose: Test if a type is movable using memmove() etc.
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// Author: Vaclav Slavik
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// Created: 2008-01-21
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// Copyright: (c) 2008 Vaclav Slavik
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_META_MOVABLE_H_
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#define _WX_META_MOVABLE_H_
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#include "wx/meta/pod.h"
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#include "wx/string.h" // for wxIsMovable<wxString> specialization
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// Helper to decide if an object of type T is "movable", i.e. if it can be
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// copied to another memory location using memmove() or realloc() C functions.
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// C++ only gurantees that POD types (including primitive types) are
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// movable.
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template<typename T>
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struct wxIsMovable
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{
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static const bool value = wxIsPod<T>::value;
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};
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// Macro to add wxIsMovable<T> specialization for given type that marks it
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// as movable:
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#define WX_DECLARE_TYPE_MOVABLE(type) \
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template<> struct wxIsMovable<type> \
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{ \
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static const bool value = true; \
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};
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// Our implementation of wxString is written in such way that it's safe to move
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// it around (unless position cache is used which unfortunately breaks this).
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// OTOH, we don't know anything about std::string.
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// (NB: we don't put this into string.h and choose to include wx/string.h from
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// here instead so that rarely-used wxIsMovable<T> code isn't included by
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// everything)
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#if !wxUSE_STD_STRING && !wxUSE_STRING_POS_CACHE
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WX_DECLARE_TYPE_MOVABLE(wxString)
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#endif
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#endif // _WX_META_MOVABLE_H_
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