/*============================================================================= | |
Boost.Wave: A Standard compliant C++ preprocessor library | |
http://www.boost.org/ | |
Copyright (c) 2001-2011 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) |