| #ifndef UTIL_STRING_PIECE_HASH_H |
| #define UTIL_STRING_PIECE_HASH_H |
| |
| #include "util/string_piece.hh" |
| |
| #include <boost/functional/hash.hpp> |
| #include <boost/version.hpp> |
| |
| inline size_t hash_value(const StringPiece &str) { |
| return boost::hash_range(str.data(), str.data() + str.length()); |
| } |
| |
| /* Support for lookup of StringPiece in boost::unordered_map<std::string> */ |
| struct StringPieceCompatibleHash : public std::unary_function<const StringPiece &, size_t> { |
| size_t operator()(const StringPiece &str) const { |
| return hash_value(str); |
| } |
| }; |
| |
| struct StringPieceCompatibleEquals : public std::binary_function<const StringPiece &, const std::string &, bool> { |
| bool operator()(const StringPiece &first, const StringPiece &second) const { |
| return first == second; |
| } |
| }; |
| template <class T> typename T::const_iterator FindStringPiece(const T &t, const StringPiece &key) { |
| #if BOOST_VERSION < 104200 |
| std::string temp(key.data(), key.size()); |
| return t.find(temp); |
| #else |
| return t.find(key, StringPieceCompatibleHash(), StringPieceCompatibleEquals()); |
| #endif |
| } |
| |
| template <class T> typename T::iterator FindStringPiece(T &t, const StringPiece &key) { |
| #if BOOST_VERSION < 104200 |
| std::string temp(key.data(), key.size()); |
| return t.find(temp); |
| #else |
| return t.find(key, StringPieceCompatibleHash(), StringPieceCompatibleEquals()); |
| #endif |
| } |
| |
| #endif // UTIL_STRING_PIECE_HASH_H |