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/*=============================================================================
Boost.Wave: A Standard compliant C++ preprocessor library
http://www.boost.org/
Copyright (c) 2001-2011 Hartmut Kaiser. 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)
=============================================================================*/
#if !defined(TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED)
#define TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED
#include <vector>
#include <boost/wave/wave_config.hpp>
#include <boost/wave/token_ids.hpp>
// this must occur after all of the includes and before any code appears
#ifdef BOOST_HAS_ABI_HEADERS
#include BOOST_ABI_PREFIX
#endif
///////////////////////////////////////////////////////////////////////////////
namespace boost {
namespace wave {
namespace cpplexer {
///////////////////////////////////////////////////////////////////////////////
//
// The token_cache template is used to cache the tokens corresponding to the
// keywords, operators and other constant language elements.
//
// This avoids repeated construction of these tokens, which is especially
// effective when used in conjunction with a copy on write string
// implementation (COW string).
//
///////////////////////////////////////////////////////////////////////////////
template <typename StringT>
class token_cache
{
public:
token_cache()
: cache(T_LAST_TOKEN - T_FIRST_TOKEN)
{
typename std::vector<StringT>::iterator it = cache.begin();
for (unsigned int i = T_FIRST_TOKEN; i < T_LAST_TOKEN; ++i, ++it)
{
*it = StringT(boost::wave::get_token_value(token_id(i)));
}
}
StringT const &get_token_value(token_id id) const
{
return cache[BASEID_FROM_TOKEN(id) - T_FIRST_TOKEN];
}
private:
std::vector<StringT> cache;
};
///////////////////////////////////////////////////////////////////////////////
} // namespace cpplexer
} // namespace wave
} // namespace boost
// the suffix header occurs after all of the code
#ifdef BOOST_HAS_ABI_HEADERS
#include BOOST_ABI_SUFFIX
#endif
#endif // !defined(TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED)
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