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add useful headers for meta-programming checks (part of patch 1860953)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51186 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2008-01-13 01:09:40 +00:00
parent 022a8a5af2
commit 0fb0ecc452
3 changed files with 46 additions and 0 deletions
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26
include/wx/meta/convertible.h Normal file
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/////////////////////////////////////////////////////////////////////////////
// Name: wx/meta/convertible.h
// Purpose: Test if types are convertible
// Author: Arne Steinarson
// Created: 2008-01-10
// RCS-ID: $Id$
// Copyright: (c) 2008 Arne Steinarson
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_CONVERTIBLE_H_
#define _WX_CONVERTIBLE_H_
// 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
{
static char Match(B* pb);
static int Match(...);
enum { value = sizeof(Match(static_cast<D*>(NULL))) == sizeof(char) };
};
#endif // _WX_CONVERTIBLE_H_