forked from boostorg/mpl
79 lines
2.2 KiB
C++
79 lines
2.2 KiB
C++
//-----------------------------------------------------------------------------
|
|
// boost mpl/index_if.hpp header file
|
|
// See http://www.boost.org for updates, documentation, and revision history.
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// Copyright (c) 2003
|
|
// Eric Friedman
|
|
//
|
|
// 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_INDEX_IF_HPP_INCLUDED
|
|
#define BOOST_MPL_INDEX_IF_HPP_INCLUDED
|
|
|
|
#include "boost/mpl/aux_/find_if_pred.hpp"
|
|
#include "boost/mpl/begin_end.hpp"
|
|
#include "boost/mpl/if.hpp"
|
|
#include "boost/mpl/int.hpp"
|
|
#include "boost/mpl/iter_fold_if.hpp"
|
|
#include "boost/mpl/lambda.hpp"
|
|
#include "boost/mpl/next.hpp"
|
|
#include "boost/mpl/protect.hpp"
|
|
#include "boost/mpl/void.hpp"
|
|
#include "boost/mpl/aux_/void_spec.hpp"
|
|
#include "boost/mpl/aux_/lambda_support.hpp"
|
|
#include "boost/type_traits/is_same.hpp"
|
|
|
|
namespace boost {
|
|
namespace mpl {
|
|
|
|
BOOST_MPL_AUX_AGLORITHM_NAMESPACE_BEGIN
|
|
|
|
template<
|
|
typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Sequence)
|
|
, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Predicate)
|
|
>
|
|
struct index_if
|
|
{
|
|
private:
|
|
|
|
typedef typename lambda<Predicate>::type pred_;
|
|
|
|
typedef typename iter_fold_if<
|
|
Sequence
|
|
, int_<0>
|
|
, protect< next<> >
|
|
, protect< aux::find_if_pred<pred_> >
|
|
>::type result_;
|
|
|
|
typedef typename end<Sequence>::type not_found_;
|
|
typedef typename result_::first result_index_;
|
|
typedef typename result_::second result_iterator_;
|
|
|
|
public:
|
|
|
|
typedef typename if_<
|
|
is_same< result_iterator_,not_found_ >
|
|
, void_
|
|
, result_index_
|
|
>::type type;
|
|
|
|
BOOST_MPL_AUX_LAMBDA_SUPPORT(2,index_if,(Sequence,Predicate))
|
|
|
|
};
|
|
|
|
BOOST_MPL_AUX_AGLORITHM_NAMESPACE_END
|
|
|
|
BOOST_MPL_AUX_ALGORITHM_VOID_SPEC(2, index_if)
|
|
|
|
} // namespace mpl
|
|
} // namespace boost
|
|
|
|
#endif // BOOST_MPL_INDEX_IF_HPP_INCLUDED
|