1 /*============================================================================= 2 Boost.Wave: A Standard compliant C++ preprocessor library 3 4 http://www.boost.org/ 5 6 Copyright (c) 2001-2012 Hartmut Kaiser. Distributed under the Boost 7 Software License, Version 1.0. (See accompanying file 8 LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 9 =============================================================================*/ 10 11 #if !defined(BOOST_TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED) 12 #define BOOST_TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED 13 14 #include <vector> 15 16 #include <boost/wave/wave_config.hpp> 17 #include <boost/wave/token_ids.hpp> 18 19 // this must occur after all of the includes and before any code appears 20 #ifdef BOOST_HAS_ABI_HEADERS 21 #include BOOST_ABI_PREFIX 22 #endif 23 24 /////////////////////////////////////////////////////////////////////////////// 25 namespace boost { 26 namespace wave { 27 namespace cpplexer { 28 29 /////////////////////////////////////////////////////////////////////////////// 30 // 31 // The token_cache template is used to cache the tokens corresponding to the 32 // keywords, operators and other constant language elements. 33 // 34 // This avoids repeated construction of these tokens, which is especially 35 // effective when used in conjunction with a copy on write string 36 // implementation (COW string). 37 // 38 /////////////////////////////////////////////////////////////////////////////// 39 template <typename StringT> 40 class token_cache 41 { 42 public: token_cache()43 token_cache() 44 : cache(T_LAST_TOKEN - T_FIRST_TOKEN) 45 { 46 typename std::vector<StringT>::iterator it = cache.begin(); 47 for (unsigned int i = T_FIRST_TOKEN; i < T_LAST_TOKEN; ++i, ++it) 48 { 49 *it = StringT(boost::wave::get_token_value(token_id(i))); 50 } 51 } 52 get_token_value(token_id id) const53 StringT const &get_token_value(token_id id) const 54 { 55 return cache[BASEID_FROM_TOKEN(id) - T_FIRST_TOKEN]; 56 } 57 58 private: 59 std::vector<StringT> cache; 60 }; 61 62 /////////////////////////////////////////////////////////////////////////////// 63 } // namespace cpplexer 64 } // namespace wave 65 } // namespace boost 66 67 // the suffix header occurs after all of the code 68 #ifdef BOOST_HAS_ABI_HEADERS 69 #include BOOST_ABI_SUFFIX 70 #endif 71 72 #endif // !defined(BOOST_TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED) 73