forked from boostorg/mpl
89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
//-----------------------------------------------------------------------------
|
|
// boost mpl/unique.hpp header file
|
|
// See http://www.boost.org for updates, documentation, and revision history.
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// Copyright (c) 2000-02
|
|
// Aleksey Gurtovoy and John R. Bandela
|
|
//
|
|
// 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_UNIQUE_HPP_INCLUDED
|
|
#define BOOST_MPL_UNIQUE_HPP_INCLUDED
|
|
|
|
#include "boost/mpl/fold_backward.hpp"
|
|
#include "boost/mpl/push_front.hpp"
|
|
#include "boost/mpl/clear.hpp"
|
|
#include "boost/mpl/front.hpp"
|
|
#include "boost/mpl/identity.hpp"
|
|
#include "boost/mpl/pair.hpp"
|
|
#include "boost/mpl/select1st.hpp"
|
|
#include "boost/mpl/lambda.hpp"
|
|
#include "boost/mpl/apply_if.hpp"
|
|
#include "boost/mpl/apply.hpp"
|
|
#include "boost/mpl/void.hpp"
|
|
#include "boost/mpl/aux_/void_spec.hpp"
|
|
#include "boost/mpl/aux_/lambda_spec.hpp"
|
|
#include "boost/type_traits/is_same.hpp"
|
|
|
|
namespace boost {
|
|
namespace mpl {
|
|
|
|
namespace aux {
|
|
|
|
template< typename Predicate >
|
|
struct unique_op
|
|
{
|
|
template< typename Pair, typename T > struct apply
|
|
{
|
|
typedef typename Pair::first seq_;
|
|
typedef typename Pair::second prior_;
|
|
typedef typename apply_if<
|
|
typename apply2<Predicate,prior_,T>::type
|
|
, identity<seq_>
|
|
, push_front<seq_,T>
|
|
>::type new_seq_;
|
|
|
|
typedef pair<new_seq_,T> type;
|
|
};
|
|
};
|
|
|
|
} // namespace aux
|
|
|
|
BOOST_MPL_AUX_PASS_THROUGH_LAMBDA_SPEC(1,aux::unique_op)
|
|
|
|
template<
|
|
typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Sequence)
|
|
, typename Predicate = is_same<_,_>
|
|
>
|
|
struct unique
|
|
{
|
|
private:
|
|
struct none_;
|
|
typedef typename lambda<Predicate>::type pred_;
|
|
typedef typename clear<Sequence>::type result_;
|
|
typedef typename fold_backward<
|
|
Sequence
|
|
, pair<result_,none_>
|
|
, aux::unique_op<pred_>
|
|
>::type fold_result_;
|
|
|
|
public:
|
|
// MSVC6.5 forces us to use 'select1st<fold_result_>::type' instead of
|
|
// simple 'fold_result_::first' here
|
|
typedef typename select1st<fold_result_>::type type;
|
|
};
|
|
|
|
BOOST_MPL_AUX_VOID_SPEC(1, unique)
|
|
|
|
} // namespace mpl
|
|
} // namespace boost
|
|
|
|
#endif // BOOST_MPL_UNIQUE_HPP_INCLUDED
|