46 lines
1.2 KiB
C++
46 lines
1.2 KiB
C++
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// Quick hack...
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// If you find this really is faster then using std::ifstream, let me know
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// as I can always spend some more time to improve it.
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namespace lexertl
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{
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template<typename CharT, class Traits>
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class basic_fast_filebuf : public std::basic_streambuf<CharT, Traits>
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{
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public:
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basic_fast_filebuf (const char *filename_) :
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_fp (0)
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{
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_fp = ::fopen(filename_, "r");
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}
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virtual ~basic_fast_filebuf()
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{
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::fclose(_fp);
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_fp = 0;
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}
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protected:
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FILE *_fp;
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virtual std::streamsize xsgetn (CharT *ptr_, std::streamsize count_)
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{
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return ::fread (ptr_, sizeof(CharT),
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static_cast<std::size_t>(count_), _fp);
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}
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};
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typedef basic_fast_filebuf<char, std::char_traits<char> > fast_filebuf;
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typedef basic_fast_filebuf<wchar_t, std::char_traits<wchar_t> > wfast_filebuf;
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}
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// Usage:
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// lexertl::rules rules_;
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// lexertl::state_machine state_machine_;
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// fast_filebuf buf ("Unicode/PropList.txt");
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// std::istream if_(&buf);
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// lexertl::stream_shared_iterator iter_ (if_);
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// lexertl::stream_shared_iterator end_;
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// lexertl::match_results<lexertl::stream_shared_iterator>
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// results_(iter_, end_);
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