text: /*=============================================================================
      Boost.Wave: A Standard compliant C++ preprocessor library
  
      http://www.boost.org/
  
      Copyright (c) 2001-2012 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(BOOST_TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED)
  #define BOOST_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(BOOST_TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED)
  