| /*============================================================================= |
| Boost.Wave: A Standard compliant C++ preprocessor library |
| |
| http://www.boost.org/ |
| |
| Copyright (c) 2001-2010 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) |