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///////////////////////////////////////////////////////////////////////////////
// assert_bos_matcher.hpp
//
// Copyright 2008 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ASSERT_BOS_MATCHER_HPP_EAN_10_04_2005
#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ASSERT_BOS_MATCHER_HPP_EAN_10_04_2005
// MS compatible compilers support #pragma once
#if defined(_MSC_VER)
# pragma once
#endif
#include <boost/xpressive/detail/detail_fwd.hpp>
#include <boost/xpressive/detail/core/quant_style.hpp>
#include <boost/xpressive/detail/core/state.hpp>
namespace boost { namespace xpressive { namespace detail
{
///////////////////////////////////////////////////////////////////////////////
// assert_bos_matcher
// match the beginning of the sequence (\A)
struct assert_bos_matcher
{
BOOST_XPR_QUANT_STYLE(quant_none, 0, true)
template<typename BidiIter, typename Next>
static bool match(match_state<BidiIter> &state, Next const &next)
{
return state.bos() && next.match(state);
}
};
}}}
#endif
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