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Expand string types for heterogeneous lookups #15

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Jul 10, 2019
Merged

Expand string types for heterogeneous lookups #15

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41 changes: 41 additions & 0 deletions parallel_hashmap/phmap.h
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Original file line number Diff line number Diff line change
Expand Up @@ -4014,6 +4014,47 @@ struct HashEq<std::string> : StringHashEq {};
template <>
struct HashEq<std::string_view> : StringHashEq {};


// support char16_t wchar_t ....
template<class CharT>
struct StringHashT
{

using is_transparent = void;

size_t operator()(std::basic_string_view<CharT> v) const {
std::string_view bv{reinterpret_cast<const char*>(v.data()), v.size()*sizeof(CharT)};
return phmap::Hash<std::string_view>{}(bv);
}
};

// Supports heterogeneous lookup for basic_string<T>-like elements.
template<class CharT>
struct StringHashEqT
{
using Hash = StringHashT<CharT>;
struct Eq {
using is_transparent = void;
bool operator()(std::basic_string_view<CharT> lhs, std::basic_string_view<CharT> rhs) const {
return lhs == rhs;
}
};
};

// char16_t
template <>
struct HashEq<std::u16string> : StringHashEqT<char16_t> {};

template <>
struct HashEq<std::u16string_view> : StringHashEqT<char16_t> {};

// wchar_t
template <>
struct HashEq<std::wstring> : StringHashEqT<wchar_t> {};

template <>
struct HashEq<std::wstring_view> : StringHashEqT<wchar_t> {};

#endif

// Supports heterogeneous lookup for pointers and smart pointers.
Expand Down