Chris@16: /*=============================================================================
Chris@16:     Boost.Wave: A Standard compliant C++ preprocessor library
Chris@16: 
Chris@16:     http://www.boost.org/
Chris@16: 
Chris@16:     Copyright (c) 2001-2012 Hartmut Kaiser. Distributed under the Boost
Chris@16:     Software License, Version 1.0. (See accompanying file
Chris@16:     LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: =============================================================================*/
Chris@16: 
Chris@16: #if !defined(TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED)
Chris@16: #define TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED
Chris@16: 
Chris@16: #include <vector>
Chris@16: 
Chris@16: #include <boost/wave/wave_config.hpp>
Chris@16: #include <boost/wave/token_ids.hpp>
Chris@16: 
Chris@16: // this must occur after all of the includes and before any code appears
Chris@16: #ifdef BOOST_HAS_ABI_HEADERS
Chris@16: #include BOOST_ABI_PREFIX
Chris@16: #endif
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: namespace boost {
Chris@16: namespace wave {
Chris@16: namespace cpplexer {
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: //
Chris@16: //  The token_cache template is used to cache the tokens corresponding to the
Chris@16: //  keywords, operators and other constant language elements.
Chris@16: //
Chris@16: //  This avoids repeated construction of these tokens, which is especially
Chris@16: //  effective when used in conjunction with a copy on write string 
Chris@16: //  implementation (COW string).
Chris@16: //
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: template <typename StringT>
Chris@16: class token_cache 
Chris@16: {
Chris@16: public:
Chris@16:     token_cache()
Chris@16:     :   cache(T_LAST_TOKEN - T_FIRST_TOKEN)
Chris@16:     {
Chris@16:         typename std::vector<StringT>::iterator it = cache.begin();
Chris@16:         for (unsigned int i = T_FIRST_TOKEN; i < T_LAST_TOKEN;  ++i, ++it)
Chris@16:         {
Chris@16:             *it = StringT(boost::wave::get_token_value(token_id(i)));
Chris@16:         }
Chris@16:     }
Chris@16: 
Chris@16:     StringT const &get_token_value(token_id id) const
Chris@16:     {
Chris@16:         return cache[BASEID_FROM_TOKEN(id) - T_FIRST_TOKEN];
Chris@16:     }
Chris@16: 
Chris@16: private:
Chris@16:     std::vector<StringT> cache;
Chris@16: };
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: }   // namespace cpplexer 
Chris@16: }   // namespace wave
Chris@16: }   // namespace boost
Chris@16: 
Chris@16: // the suffix header occurs after all of the code
Chris@16: #ifdef BOOST_HAS_ABI_HEADERS
Chris@16: #include BOOST_ABI_SUFFIX
Chris@16: #endif
Chris@16: 
Chris@16: #endif // !defined(TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED)