1 files changed, 50 insertions, 0 deletions
diff --git a/asl/base/defer.hpp b/asl/base/defer.hpp
new file mode 100644
index 0000000..b6d52af
--- /dev/null
+++ b/asl/base/defer.hpp
@@ -0,0 +1,50 @@
+#pragma once
+
+#include "asl/base/utility.hpp"
+#include "asl/base/functional.hpp"
+
+namespace asl
+{
+
+// @Todo Add invokable check
+template<typename Callback>
+class DeferCallback
+{
+    Callback m_callback;
+    bool     m_moved = false;
+
+public:
+    template<typename T>
+    explicit DeferCallback(T&& callback) : m_callback(ASL_FWD(callback))
+    {
+    }
+
+    ASL_DELETE_COPY(DeferCallback);
+
+    DeferCallback(DeferCallback&& other) :
+        m_callback(ASL_MOVE(other.m_callback)), m_moved(exchange(other.m_moved, true))
+    {
+    }
+
+    DeferCallback& operator=(DeferCallback&&) = delete;
+
+    ~DeferCallback()
+    {
+        if (!m_moved) { invoke(m_callback); }
+    }
+};
+
+struct DeferFactory
+{
+    // @Todo Add invokable check
+    template<typename Callback>
+    DeferCallback<Callback> operator<<(Callback&& callback) const
+    {
+        return DeferCallback<Callback>(ASL_FWD(callback));
+    }
+};
+
+} // namespace asl
+
+#define ASL_DEFER auto ASL_CONCAT(_defer_, __COUNTER__) = ::asl::DeferFactory{} <<
+