author | hgs |
Wed, 13 Oct 2010 19:39:18 +0530 | |
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#ifndef BOOST_STRONG_TYPEDEF_HPP |
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#define BOOST_STRONG_TYPEDEF_HPP |
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// MS compatible compilers support #pragma once |
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#if defined(_MSC_VER) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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/////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8 |
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// strong_typedef.hpp: |
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// (C) Copyright 2002 Robert Ramey - http://www.rrsd.com . |
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// Use, modification and distribution is subject to the Boost Software |
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// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// See http://www.boost.org for updates, documentation, and revision history. |
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// macro used to implement a strong typedef. strong typedef |
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// guarentees that two types are distinguised even though the |
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// share the same underlying implementation. typedef does not create |
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// a new type. BOOST_STRONG_TYPEDEF(T, D) creates a new type named D |
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// that operates as a type T. |
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#include <boost/operators.hpp> |
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#define BOOST_STRONG_TYPEDEF(T, D) \ |
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struct D \ |
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: boost::totally_ordered1< D \ |
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, boost::totally_ordered2< D, T \ |
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> > \ |
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{ \ |
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T t; \ |
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explicit D(const T t_) : t(t_) {}; \ |
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D(){}; \ |
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D(const D & t_) : t(t_.t){} \ |
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D & operator=(const D & rhs) { t = rhs.t; return *this;} \ |
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D & operator=(const T & rhs) { t = rhs; return *this;} \ |
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operator const T & () const {return t; } \ |
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operator T & () { return t; } \ |
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bool operator==(const D & rhs) const { return t == rhs.t; } \ |
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bool operator<(const D & rhs) const { return t < rhs.t; } \ |
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}; |
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#endif // BOOST_STRONG_TYPEDEF_HPP |