73 lines
2.4 KiB
C++
73 lines
2.4 KiB
C++
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/*=============================================================================
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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) 2001-2012 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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