Update Nemirtingas overlay to latest.

overlay_experimental/System/StringSwitch.hpp

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) Nemirtingas
+ * This file is part of System.
+ *
+ * System is free software; you can redistribute it
+ * and/or modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 3 of the License, or (at your option) any later version.
+ *
+ * System is distributed in the hope that it will be
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with System; if not, see
+ * <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <cstdint>
+#include <string>
+
+#include "SystemDetector.h"
+#include "StringView.hpp"
+
+namespace System {
+
+namespace StringSwitch {
+
+#if defined(SYSTEM_ARCH_X86)
+    using hash_type = uint32_t;
+#else
+    using hash_type = uint64_t;
+#endif
+
+namespace Detail {
+    constexpr char lower_char(char c) { return ((c >= 'A' && c <= 'Z') ? c + 32 : c); }
+}
+
+// switch case on a string
+constexpr hash_type Hash(const char* input, size_t len) { return (len > 0 ? static_cast<hash_type>(*input) + 33 * Hash(input + 1, len - 1) : 5381); }
+
+template<size_t N>
+constexpr hash_type Hash(const char(&input)[N]) { return Hash(input, N-1); }
+
+constexpr hash_type Hash(System::StringView sv) { return Hash(sv.data(), sv.length()); }
+
+inline hash_type Hash(const std::string& input) { return Hash(input.c_str(), input.length()); }
+
+
+
+constexpr hash_type IHash(const char* input, size_t len) { return (len > 0 ? static_cast<hash_type>(Detail::lower_char(*input)) + 33 * IHash(input + 1, len - 1) : 5381); }
+
+template<size_t N>
+constexpr inline hash_type IHash(const char(&input)[N]) { return IHash(input, N - 1); }
+
+constexpr hash_type IHash(System::StringView sv) { return IHash(sv.data(), sv.length()); }
+
+inline hash_type IHash(const std::string& input) { return IHash(input.c_str(), input.length()); }
+
+}
+}