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implement 'switch' construct

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[SVN r17633]
This commit is contained in:
Aleksey Gurtovoy
2003-02-25 11:51:56 +00:00
parent a9ca707add
commit b5979f51cd
3 changed files with 117 additions and 4 deletions
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48
include/boost/mpl/deref.hpp Normal file
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@@ -0,0 +1,48 @@
//-----------------------------------------------------------------------------
// boost mpl/deref.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2002-03
// Aleksey Gurtovoy
//
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appears in all copies and
// that both the copyright notice and this permission notice appear in
// supporting documentation. No representations are made about the
// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
#ifndef BOOST_MPL_DEREF_HPP_INCLUDED
#define BOOST_MPL_DEREF_HPP_INCLUDED
#include "boost/mpl/aux_/void_spec.hpp"
#include "boost/mpl/aux_/lambda_support.hpp"
#include "boost/mpl/aux_/config/eti.hpp"
namespace boost {
namespace mpl {
template<
typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Iterator)
>
struct deref
{
typedef typename Iterator::type type;
BOOST_MPL_AUX_LAMBDA_SUPPORT(1,deref,(Iterator))
};
#if defined(BOOST_MPL_MSVC_ETI_BUG)
template<> struct deref<int>
{
typedef int type;
};
#endif
BOOST_MPL_AUX_VOID_SPEC(1, deref)
} // namespace mpl
} // namespace boost
#endif // BOOST_MPL_DEREF_HPP_INCLUDED

18
include/boost/mpl/select2nd.hpp
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@@ -3,7 +3,7 @@
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2000-02
// Copyright (c) 2000-03
// Aleksey Gurtovoy
//
// Permission to use, copy, modify, distribute and sell this software
@@ -17,20 +17,30 @@
#ifndef BOOST_MPL_SELECT2ND_HPP_INCLUDED
#define BOOST_MPL_SELECT2ND_HPP_INCLUDED
#include "boost/mpl/aux_/lambda_spec.hpp"
#include "boost/mpl/aux_/void_spec.hpp"
#include "boost/mpl/aux_/lambda_support.hpp"
#include "boost/mpl/aux_/config/eti.hpp"
namespace boost {
namespace mpl {
template<
typename Pair
typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Pair)
>
struct select2nd
{
typedef typename Pair::second type;
BOOST_MPL_AUX_LAMBDA_SUPPORT(1,select2nd,(Pair))
};
BOOST_MPL_AUX_LAMBDA_SPEC(1, select2nd)
#if defined(BOOST_MPL_MSVC_60_ETI_BUG)
template<> struct select2nd<int>
{
typedef int type;
};
#endif
BOOST_MPL_AUX_VOID_SPEC(1, select2nd)
} // namespace mpl
} // namespace boost

55
include/boost/mpl/switch.hpp Normal file
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@@ -0,0 +1,55 @@
//-----------------------------------------------------------------------------
// boost mpl/switch.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2003
// Aleksey Gurtovoy
//
// Permission to use, copy, modify, distribute and sell this software
// and its documentation for any purpose is hereby granted without fee,
// provided that the above copyright notice appears in all copies and
// that both the copyright notice and this permission notice appear in
// supporting documentation. No representations are made about the
// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
#ifndef BOOST_MPL_SWITCH_HPP_INCLUDED
#define BOOST_MPL_SWITCH_HPP_INCLUDED
#include "boost/mpl/find_if.hpp"
#include "boost/mpl/select1st.hpp"
#include "boost/mpl/select2nd.hpp"
#include "boost/mpl/deref.hpp"
#include "boost/mpl/lambda.hpp"
#include "boost/mpl/apply.hpp"
#include "boost/mpl/aux_/void_spec.hpp"
#include "boost/mpl/aux_/lambda_support.hpp"
namespace boost {
namespace mpl {
template<
typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Body)
, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T)
>
struct switch_
{
typedef typename find_if<
Body
, apply1< lambda< select1st<_1> >, T >
>::type iter_;
typedef typename deref<iter_>::type pair_;
typedef typename lambda< typename select2nd<pair_>::type >::type f_;
typedef typename apply1<f_,T>::type type;
BOOST_MPL_AUX_LAMBDA_SUPPORT(2,switch_,(Body,T))
};
BOOST_MPL_AUX_VOID_SPEC(2, switch_)
} // namespace mpl
} // namespace boost
#endif // BOOST_MPL_SWITCH_HPP_INCLUDED