IVGCVSW-4519 Remove Boost Variant and apply_visitor variant
* add mapbox/variant third party package
Signed-off-by: James Ward <james.ward@arm.com>
Change-Id: I181302780edd9dace40f158a11327316a12ce69a
diff --git a/third-party/mapbox/recursive_wrapper.hpp b/third-party/mapbox/recursive_wrapper.hpp
new file mode 100644
index 0000000..4ffcbd7
--- /dev/null
+++ b/third-party/mapbox/recursive_wrapper.hpp
@@ -0,0 +1,122 @@
+#ifndef MAPBOX_UTIL_RECURSIVE_WRAPPER_HPP
+#define MAPBOX_UTIL_RECURSIVE_WRAPPER_HPP
+
+// Based on variant/recursive_wrapper.hpp from boost.
+//
+// Original license:
+//
+// Copyright (c) 2002-2003
+// Eric Friedman, Itay Maman
+//
+// 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)
+
+#include <cassert>
+#include <utility>
+
+namespace mapbox {
+namespace util {
+
+template <typename T>
+class recursive_wrapper
+{
+
+ T* p_;
+
+ void assign(T const& rhs)
+ {
+ this->get() = rhs;
+ }
+
+public:
+ using type = T;
+
+ /**
+ * Default constructor default initializes the internally stored value.
+ * For POD types this means nothing is done and the storage is
+ * uninitialized.
+ *
+ * @throws std::bad_alloc if there is insufficient memory for an object
+ * of type T.
+ * @throws any exception thrown by the default constructur of T.
+ */
+ recursive_wrapper()
+ : p_(new T){}
+
+ ~recursive_wrapper() noexcept { delete p_; }
+
+ recursive_wrapper(recursive_wrapper const& operand)
+ : p_(new T(operand.get())) {}
+
+ recursive_wrapper(T const& operand)
+ : p_(new T(operand)) {}
+
+ recursive_wrapper(recursive_wrapper&& operand)
+ : p_(new T(std::move(operand.get()))) {}
+
+ recursive_wrapper(T&& operand)
+ : p_(new T(std::move(operand))) {}
+
+ inline recursive_wrapper& operator=(recursive_wrapper const& rhs)
+ {
+ assign(rhs.get());
+ return *this;
+ }
+
+ inline recursive_wrapper& operator=(T const& rhs)
+ {
+ assign(rhs);
+ return *this;
+ }
+
+ inline void swap(recursive_wrapper& operand) noexcept
+ {
+ T* temp = operand.p_;
+ operand.p_ = p_;
+ p_ = temp;
+ }
+
+ recursive_wrapper& operator=(recursive_wrapper&& rhs) noexcept
+ {
+ swap(rhs);
+ return *this;
+ }
+
+ recursive_wrapper& operator=(T&& rhs)
+ {
+ get() = std::move(rhs);
+ return *this;
+ }
+
+ T& get()
+ {
+ assert(p_);
+ return *get_pointer();
+ }
+
+ T const& get() const
+ {
+ assert(p_);
+ return *get_pointer();
+ }
+
+ T* get_pointer() { return p_; }
+
+ const T* get_pointer() const { return p_; }
+
+ operator T const&() const { return this->get(); }
+
+ operator T&() { return this->get(); }
+
+}; // class recursive_wrapper
+
+template <typename T>
+inline void swap(recursive_wrapper<T>& lhs, recursive_wrapper<T>& rhs) noexcept
+{
+ lhs.swap(rhs);
+}
+} // namespace util
+} // namespace mapbox
+
+#endif // MAPBOX_UTIL_RECURSIVE_WRAPPER_HPP