35 lines
865 B
C++
35 lines
865 B
C++
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#ifndef OSRM_STRING_VIEW_HPP
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#define OSRM_STRING_VIEW_HPP
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#include <boost/functional/hash.hpp>
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#include <boost/utility/string_ref.hpp>
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namespace osrm
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{
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namespace util
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{
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// Convenience typedef: boost::string_ref, boost::string_view or C++17's string_view
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using StringView = boost::string_ref;
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} // namespace util
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} // namespace osrm
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// Specializing hash<> for user-defined type in std namespace, this is standard conforming.
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namespace std
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{
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template <> struct hash<::osrm::util::StringView> final
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{
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std::size_t operator()(::osrm::util::StringView v) const noexcept
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{
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// Bring into scope and call un-qualified for ADL:
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// remember we want to be able to switch impl. above.
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using std::begin;
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using std::end;
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return boost::hash_range(begin(v), end(v));
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}
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};
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} // namespace std
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#endif /* OSRM_STRING_VIEW_HPP */
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