poco/Foundation/include/Poco/MetaProgramming.h

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2008-02-07 17:08:15 +01:00
//
// TypeChecks.h
//
// $Id: //poco/svn/Foundation/include/Poco/MetaProgramming.h#2 $
//
// Library: Foundation
// Package: Core
// Module: MetaProgramming
//
// Common definitions useful for Meta Template Programming
//
// Copyright (c) 2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef Foundation_TypeChecks_INCLUDED
#define Foundation_TypeChecks_INCLUDED
#include "Poco/Foundation.h"
namespace Poco {
template <typename T>
struct IsReference
///Use this struct to determine if a template type is a reference
{
enum
{
VALUE = 0
};
};
template <typename T>
struct IsReference<T&>
{
enum
{
VALUE = 1
};
};
template <typename T>
struct IsReference<const T&>
{
enum
{
VALUE = 1
};
};
template <typename T>
struct IsConst
///Use this struct to determine if a template type is a const type
{
enum
{
VALUE = 0
};
};
template <typename T>
struct IsConst<const T&>
{
enum
{
VALUE = 1
};
};
template <typename T>
struct IsConst<const T>
{
enum
{
VALUE = 1
};
};
template <typename T>
struct TypeWrapper
/// Use the type wrapper if you want to dedecouple constness and references from template types
{
typedef T TYPE;
typedef const T CONSTTYPE;
typedef T& REFTYPE;
typedef const T& CONSTREFTYPE;
};
template <typename T>
struct TypeWrapper<const T>
{
typedef T TYPE;
typedef const T CONSTTYPE;
typedef T& REFTYPE;
typedef const T& CONSTREFTYPE;
};
template <typename T>
struct TypeWrapper<const T&>
{
typedef T TYPE;
typedef const T CONSTTYPE;
typedef T& REFTYPE;
typedef const T& CONSTREFTYPE;
};
template <typename T>
struct TypeWrapper<T&>
{
typedef T TYPE;
typedef const T CONSTTYPE;
typedef T& REFTYPE;
typedef const T& CONSTREFTYPE;
};
} // namespace Poco
#endif