.hpp instead of .h for C++ headers

1 files changed, 64 insertions, 0 deletions

diff --git a/handle.hpp b/handle.hpp
new file mode 100644
index 0000000..5f83f24
--- /dev/null
+++ b/handle.hpp
@@ -0,0 +1,64 @@
+#pragma once
+
+#include <Windows.h>
+
+#include <cassert>
+
+#include <memory>
+#include <utility>
+
+class Handle
+{
+public:
+    Handle() = default;
+
+    explicit Handle(HANDLE raw)
+        : impl{raw}
+    { }
+
+    Handle(Handle&& other) noexcept
+    {
+        swap(other);
+    }
+
+    Handle& operator=(Handle other) noexcept
+    {
+        swap(other);
+        return *this;
+    }
+
+    void swap(Handle& other) noexcept
+    {
+        using std::swap;
+        swap(impl, other.impl);
+    }
+
+    operator HANDLE() const
+    {
+        return impl.get();
+    }
+
+private:
+    struct Close
+    {
+        void operator()(HANDLE raw) const
+        {
+            if (raw == NULL || raw == INVALID_HANDLE_VALUE)
+                return;
+            const auto ret = CloseHandle(raw);
+            assert(ret);
+        }
+    };
+
+    std::unique_ptr<void, Close> impl;
+
+    Handle(const Handle&) = delete;
+};
+
+namespace std
+{
+    void swap(Handle& a, Handle& b) noexcept
+    {
+        a.swap(b);
+    }
+}