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72 lines
2.3 KiB
72 lines
2.3 KiB
/*============================================================================= |
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Boost.Wave: A Standard compliant C++ preprocessor library |
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http://www.boost.org/ |
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Copyright (c) 2001-2011 Hartmut Kaiser. Distributed under the Boost |
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Software License, Version 1.0. (See accompanying file |
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LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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=============================================================================*/ |
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#if !defined(TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED) |
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#define TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED |
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#include <vector> |
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#include <boost/wave/wave_config.hpp> |
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#include <boost/wave/token_ids.hpp> |
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// this must occur after all of the includes and before any code appears |
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#ifdef BOOST_HAS_ABI_HEADERS |
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#include BOOST_ABI_PREFIX |
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#endif |
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/////////////////////////////////////////////////////////////////////////////// |
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namespace boost { |
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namespace wave { |
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namespace cpplexer { |
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/////////////////////////////////////////////////////////////////////////////// |
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// |
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// The token_cache template is used to cache the tokens corresponding to the |
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// keywords, operators and other constant language elements. |
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// |
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// This avoids repeated construction of these tokens, which is especially |
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// effective when used in conjunction with a copy on write string |
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// implementation (COW string). |
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// |
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/////////////////////////////////////////////////////////////////////////////// |
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template <typename StringT> |
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class token_cache |
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{ |
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public: |
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token_cache() |
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: cache(T_LAST_TOKEN - T_FIRST_TOKEN) |
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{ |
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typename std::vector<StringT>::iterator it = cache.begin(); |
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for (unsigned int i = T_FIRST_TOKEN; i < T_LAST_TOKEN; ++i, ++it) |
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{ |
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*it = StringT(boost::wave::get_token_value(token_id(i))); |
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} |
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} |
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StringT const &get_token_value(token_id id) const |
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{ |
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return cache[BASEID_FROM_TOKEN(id) - T_FIRST_TOKEN]; |
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} |
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private: |
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std::vector<StringT> cache; |
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}; |
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/////////////////////////////////////////////////////////////////////////////// |
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} // namespace cpplexer |
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} // namespace wave |
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} // namespace boost |
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// the suffix header occurs after all of the code |
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#ifdef BOOST_HAS_ABI_HEADERS |
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#include BOOST_ABI_SUFFIX |
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#endif |
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#endif // !defined(TOKEN_CACHE_HPP_4D2320B7_1D56_4113_A114_397E70FA438C_INCLUDED)
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