Upgrade Lua service intercepts (#775)

Co-authored-by: Théo B. <16072534+LiquidFenrir@users.noreply.github.com>

include/services/service_map.hpp

@@ -0,0 +1,29 @@
+#pragma once
+#include <string>
+#include <type_traits>
+#include <utility>
+
+#include "handles.hpp"
+
+// Helpers for constructing std::maps to look up OS services.
+// We want to be able to map both service names -> services (Used for OS emulation)
+// And service handles -> services (For Lua service call intercepts)
+using ServiceMapEntry = std::pair<std::string, HorizonHandle>;
+
+// Comparator for constructing a name->handle service map
+struct ServiceMapByNameComparator {
+	// The comparators must be transparent, as our search key is different from our set key
+	// Our set key is a ServiceMapEntry, while the comparator each time is either the name or the service handle
+	using is_transparent = std::true_type;
+	bool operator()(const ServiceMapEntry& lhs, std::string_view rhs) const { return lhs.first < rhs; }
+	bool operator()(std::string_view lhs, const ServiceMapEntry& rhs) const { return lhs < rhs.first; }
+	bool operator()(const ServiceMapEntry& lhs, const ServiceMapEntry& rhs) const { return lhs.first < rhs.first; }
+};
+
+// Comparator for constructing a handle->name service map
+struct ServiceMapByHandleComparator {
+	using is_transparent = std::true_type;
+	bool operator()(const ServiceMapEntry& lhs, HorizonHandle rhs) const { return lhs.second < rhs; }
+	bool operator()(HorizonHandle lhs, const ServiceMapEntry& rhs) const { return lhs < rhs.second; }
+	bool operator()(const ServiceMapEntry& lhs, const ServiceMapEntry& rhs) const { return lhs.second < rhs.second; }
+};