First Commit

common/HeterogeneousContainers.h

@@ -0,0 +1,67 @@
+// SPDX-FileCopyrightText: 2002-2025 PCSX2 Dev Team
+// SPDX-License-Identifier: GPL-3.0+
+
+/**
+ * Provides a map template which doesn't require heap allocations for lookups.
+ */
+
+#pragma once
+
+#include "Pcsx2Defs.h"
+#include <map>
+#include <set>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+
+namespace detail
+{
+	struct transparent_string_hash
+	{
+		using is_transparent = void;
+
+		std::size_t operator()(const std::string_view& v) const { return std::hash<std::string_view>{}(v); }
+		std::size_t operator()(const std::string& s) const { return std::hash<std::string>{}(s); }
+		std::size_t operator()(const char* s) const { return operator()(std::string_view(s)); }
+	};
+
+	struct transparent_string_equal
+	{
+		using is_transparent = void;
+
+		bool operator()(const std::string& lhs, const std::string_view& rhs) const { return lhs == rhs; }
+		bool operator()(const std::string& lhs, const std::string& rhs) const { return lhs == rhs; }
+		bool operator()(const std::string& lhs, const char* rhs) const { return lhs == rhs; }
+		bool operator()(const std::string_view& lhs, const std::string& rhs) const { return lhs == rhs; }
+		bool operator()(const char* lhs, const std::string& rhs) const { return lhs == rhs; }
+	};
+
+	struct transparent_string_less
+	{
+		using is_transparent = void;
+
+		bool operator()(const std::string& lhs, const std::string_view& rhs) const { return lhs < rhs; }
+		bool operator()(const std::string& lhs, const std::string& rhs) const { return lhs < rhs; }
+		bool operator()(const std::string& lhs, const char* rhs) const { return lhs < rhs; }
+		bool operator()(const std::string_view& lhs, const std::string& rhs) const { return lhs < rhs; }
+		bool operator()(const char* lhs, const std::string& rhs) const { return lhs < rhs; }
+	};
+} // namespace detail
+
+template <typename ValueType>
+using UnorderedStringMap =
+	std::unordered_map<std::string, ValueType, detail::transparent_string_hash, detail::transparent_string_equal>;
+template <typename ValueType>
+using UnorderedStringMultimap =
+	std::unordered_multimap<std::string, ValueType, detail::transparent_string_hash, detail::transparent_string_equal>;
+using UnorderedStringSet =
+	std::unordered_set<std::string, detail::transparent_string_hash, detail::transparent_string_equal>;
+using UnorderedStringMultiSet =
+	std::unordered_multiset<std::string, detail::transparent_string_hash, detail::transparent_string_equal>;
+
+template <typename ValueType>
+using StringMap = std::map<std::string, ValueType, detail::transparent_string_less>;
+template <typename ValueType>
+using StringMultiMap = std::multimap<std::string, ValueType, detail::transparent_string_less>;
+using StringSet = std::set<std::string, detail::transparent_string_less>;
+using StringMultiSet = std::multiset<std::string, detail::transparent_string_less>;