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48 lines
1.7 KiB
48 lines
1.7 KiB
2 years ago
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#pragma once
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#include <cstdint>
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#include <string>
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#include <string_view>
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#include <ankerl/unordered_dense.h>
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namespace devilution {
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// A hash functor that enables heterogenous lookup for `unordered_set/map`.
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struct StringViewHash {
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using is_transparent = void;
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using is_avalanching = void;
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[[nodiscard]] uint64_t operator()(std::string_view str) const noexcept
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{
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return ankerl::unordered_dense::hash<std::string_view> {}(str);
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}
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[[nodiscard]] uint64_t operator()(const char *str) const noexcept
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{
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return (*this)(std::string_view { str });
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}
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[[nodiscard]] uint64_t operator()(const std::string &str) const noexcept
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{
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return (*this)(std::string_view { str });
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}
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};
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// Usually we'd use `std::equal_to<>` instead but the latter
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// does not link on the libcxx that comes with Xbox NXDK as of Aug 2024,
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struct StringViewEquals {
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using is_transparent = void;
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[[nodiscard]] bool operator()(std::string_view a, std::string_view b) const { return a == b; }
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[[nodiscard]] bool operator()(std::string_view a, const std::string &b) const { return a == b; }
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[[nodiscard]] bool operator()(const std::string &a, std::string_view &b) const { return a == b; }
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[[nodiscard]] bool operator()(const char *a, const std::string &b) const { return a == b; }
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[[nodiscard]] bool operator()(const std::string &a, const char *b) const { return a == b; }
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[[nodiscard]] bool operator()(std::string_view a, const char *b) const { return a == b; }
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[[nodiscard]] bool operator()(const char *a, std::string_view b) const { return a == b; }
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[[nodiscard]] bool operator()(const char *a, const char *b) const { return std::string_view { a } == b; }
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};
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} // namespace devilution
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