Reorganize source files

include/beast/detail/empty_base_optimization.hpp

@@ -0,0 +1,94 @@
+//
+// Copyright (c) 2013-2016 Vinnie Falco (vinnie dot falco at gmail dot com)
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+//
+
+#ifndef BEAST_DETAIL_EMPTY_BASE_OPTIMIZATION_HPP
+#define BEAST_DETAIL_EMPTY_BASE_OPTIMIZATION_HPP
+
+#include <type_traits>
+#include <utility>
+
+namespace beast {
+namespace detail {
+
+template <class T>
+struct empty_base_optimization_decide
+    : std::integral_constant <bool,
+        std::is_empty <T>::value
+#ifdef __clang__
+        && !__is_final(T)
+#endif
+    >
+{
+};
+
+template <
+    class T,
+    int UniqueID = 0,
+    bool ShouldDeriveFrom =
+        empty_base_optimization_decide<T>::value
+>
+class empty_base_optimization : private T
+{
+public:
+    empty_base_optimization() = default;
+
+    empty_base_optimization(T const& t)
+        : T (t)
+    {}
+
+    empty_base_optimization(T&& t)
+        : T (std::move (t))
+    {}
+
+    T& member() noexcept
+    {
+        return *this;
+    }
+
+    T const& member() const noexcept
+    {
+        return *this;
+    }
+};
+
+//------------------------------------------------------------------------------
+
+template <
+    class T,
+    int UniqueID
+>
+class empty_base_optimization <T, UniqueID, false>
+{
+public:
+    empty_base_optimization() = default;
+
+    empty_base_optimization(T const& t)
+        : m_t (t)
+    {}
+
+    empty_base_optimization(T&& t)
+        : m_t (std::move (t))
+    {}
+
+    T& member() noexcept
+    {
+        return m_t;
+    }
+
+    T const& member() const noexcept
+    {
+        return m_t;
+    }
+
+private:
+    T m_t;
+};
+
+} // detail
+} // beast
+
+#endif