Added MIJIN_SCOPE_EXIT and MIJIN_CONCAT macros.

source/mijin/util/common_macros.hpp

@@ -0,0 +1,10 @@
+
+#pragma once
+
+#if !defined(MIJIN_UTIL_COMMON_MACROS_HPP_INCLUDED)
+#define MIJIN_UTIL_COMMON_MACROS_HPP_INCLUDED 1
+
+#define MIJIN_CONCAT2(a, b) a ## b
+#define MIJIN_CONCAT(a, b) MIJIN_CONCAT2(a, b)
+
+#endif // defined(MIJIN_UTIL_COMMON_MACROS_HPP_INCLUDED)

source/mijin/util/scope_guard.hpp

@@ -0,0 +1,42 @@
+#pragma once
+
+#if !defined(MIJIN_UTIL_SCOPE_GUARD_HPP_INCLUDED)
+#define MIJIN_UTIL_SCOPE_GUARD_HPP_INCLUDED 1
+
+#include <functional>
+#include "./common_macros.hpp"
+
+#define MIJIN_SCOPE_EXIT_NAMED(name) \
+mijin::ScopeExitGuard name = [&]()
+
+#define MIJIN_SCOPE_EXIT MIJIN_SCOPE_EXIT_NAMED(MIJIN_CONCAT(MIJIN_CONCAT(scope_guard_, __LINE__), __))
+
+namespace mijin
+{
+class ScopeExitGuard
+{
+private:
+    std::function<void(void)> func;
+public:
+    template<typename TFunc>
+    inline ScopeExitGuard(TFunc&& func_) noexcept : func(std::forward<TFunc>(func_)) {}
+    ScopeExitGuard(const ScopeExitGuard&) noexcept = delete;
+    ScopeExitGuard(ScopeExitGuard&&) noexcept = delete;
+    inline ~ScopeExitGuard() noexcept
+    {
+        if (func) {
+            func();
+        }
+    }
+
+    ScopeExitGuard& operator=(const ScopeExitGuard&) noexcept = delete;
+    ScopeExitGuard& operator=(ScopeExitGuard&&) noexcept = delete;
+
+    inline void reset() noexcept
+    {
+        func = {};
+    }
+};
+}
+
+#endif // defined(MIJIN_UTIL_SCOPE_GUARD_HPP_INCLUDED)