From 2c92e07f337e42cf58970443f9de678f85a9b2a4 Mon Sep 17 00:00:00 2001
From: rtk0c <mail.tianyig@gmail.com>
Date: Thu, 19 Oct 2023 22:50:07 -0700
Subject: The great renaming: switch to "module style"

---
 src/brussel.common/RTTI.hpp | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 src/brussel.common/RTTI.hpp

(limited to 'src/brussel.common/RTTI.hpp')

diff --git a/src/brussel.common/RTTI.hpp b/src/brussel.common/RTTI.hpp
new file mode 100644
index 0000000..bd9475b
--- /dev/null
+++ b/src/brussel.common/RTTI.hpp
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <cassert>
+
+template <typename T, typename TBase>
+bool is_a(TBase* t) {
+	assert(t != nullptr);
+	return T::IsInstance(t);
+}
+
+template <typename T, typename TBase>
+bool is_a_nullable(TBase* t) {
+	if (t) {
+		return is_a<T, TBase>(t);
+	} else {
+		return false;
+	}
+}
+
+template <typename T, typename TBase>
+T* dyn_cast(TBase* t) {
+	assert(t != nullptr);
+	if (T::IsInstance(t)) {
+		return static_cast<T*>(t);
+	} else {
+		return nullptr;
+	}
+}
+
+template <typename T, typename TBase>
+const T* dyn_cast(const TBase* t) {
+	assert(t != nullptr);
+	if (T::IsInstance(t)) {
+		return static_cast<const T*>(t);
+	} else {
+		return nullptr;
+	}
+}
+
+template <typename T, typename TBase>
+T* dyn_cast_nullable(TBase* t) {
+	if (!t) return nullptr;
+	return dyn_cast<T, TBase>(t);
+}
-- 
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