add T_raw_mem for RAII raw memory

1 files changed, 67 insertions, 0 deletions

diff --git a/include/memory.h b/include/memory.h
new file mode 100644
index 0000000..6cf4536
--- /dev/null
+++ b/include/memory.h
@@ -0,0 +1,67 @@
+#pragma once
+
+#include <string>
+
+namespace ov4
+{
+
+template <typename T>
+class T_raw_mem
+{
+
+public:
+
+    void *_p;
+    std::size_t _len;
+
+    explicit T_raw_mem(std::size_t size)
+    {
+        _p = operator new(size);
+        _len = size;
+    }
+
+    ~T_raw_mem()
+    {
+        operator delete(_p);
+    }
+
+    T *get() const noexcept
+    {
+        return static_cast<T*>(_p);
+    }
+
+    std::size_t get_size() const noexcept
+    {
+        return len;
+    }
+
+    // COPY is not allowed
+    T_raw_mem(const T_raw_mem&) = delete;
+    T_raw_mem& operator=(const T_raw_mem&) = delete;
+
+    // MOVE constructor
+    T_raw_mem(T_raw_mem &&x) noexcept
+        : p(std::exchange(x._p, nullptr)), slen(std::exchange(x._len, 0))
+    { /* empty */ }
+
+    T_raw_mem& operator=(T_raw_mem &&x) noexcept
+    {
+        // if they are same
+        // release itself, which is not expected
+        if (this != &x)
+        {
+            // consider statement: y = x;
+            // release memory of y (if exist)
+            operator delete(_p);
+
+            // and then move
+            _p = std::exchange(x._p, nullptr);
+            _len = std::exchange(x._len, 0);
+        }
+
+        return *this;
+    }
+
+};
+
+}