/usr/include/wx-3.0/wx/meta/convertible.h is in wx3.0-headers 3.0.0-2.
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// Name: wx/meta/convertible.h
// Purpose: Test if types are convertible
// Author: Arne Steinarson
// Created: 2008-01-10
// Copyright: (c) 2008 Arne Steinarson
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_META_CONVERTIBLE_H_
#define _WX_META_CONVERTIBLE_H_
//
// Introduce an extra class to make this header compilable with g++3.2
//
template <class D, class B>
struct wxConvertibleTo_SizeHelper
{
static char Match(B* pb);
static int Match(...);
};
// Helper to decide if an object of type D is convertible to type B (the test
// succeeds in particular when D derives from B)
template <class D, class B>
struct wxConvertibleTo
{
enum
{
value =
sizeof(wxConvertibleTo_SizeHelper<D,B>::Match(static_cast<D*>(NULL)))
==
sizeof(char)
};
};
#endif // _WX_META_CONVERTIBLE_H_
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