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/variant_cast.hpp b/third-party/mapbox/variant_cast.hpp
new file mode 100644
index 0000000..fe1ab35
--- /dev/null
+++ b/third-party/mapbox/variant_cast.hpp
@@ -0,0 +1,85 @@
+#ifndef VARIANT_CAST_HPP
+#define VARIANT_CAST_HPP
+
+#include <type_traits>
+
+namespace mapbox {
+namespace util {
+
+namespace detail {
+
+template <class T>
+class static_caster
+{
+public:
+ template <class V>
+ T& operator()(V& v) const
+ {
+ return static_cast<T&>(v);
+ }
+};
+
+template <class T>
+class dynamic_caster
+{
+public:
+ using result_type = T&;
+ template <class V>
+ T& operator()(V& v, typename std::enable_if<!std::is_polymorphic<V>::value>::type* = nullptr) const
+ {
+ throw std::bad_cast();
+ }
+ template <class V>
+ T& operator()(V& v, typename std::enable_if<std::is_polymorphic<V>::value>::type* = nullptr) const
+ {
+ return dynamic_cast<T&>(v);
+ }
+};
+
+template <class T>
+class dynamic_caster<T*>
+{
+public:
+ using result_type = T*;
+ template <class V>
+ T* operator()(V& v, typename std::enable_if<!std::is_polymorphic<V>::value>::type* = nullptr) const
+ {
+ return nullptr;
+ }
+ template <class V>
+ T* operator()(V& v, typename std::enable_if<std::is_polymorphic<V>::value>::type* = nullptr) const
+ {
+ return dynamic_cast<T*>(&v);
+ }
+};
+}
+
+template <class T, class V>
+typename detail::dynamic_caster<T>::result_type
+dynamic_variant_cast(V& v)
+{
+ return mapbox::util::apply_visitor(detail::dynamic_caster<T>(), v);
+}
+
+template <class T, class V>
+typename detail::dynamic_caster<const T>::result_type
+dynamic_variant_cast(const V& v)
+{
+ return mapbox::util::apply_visitor(detail::dynamic_caster<const T>(), v);
+}
+
+template <class T, class V>
+T& static_variant_cast(V& v)
+{
+ return mapbox::util::apply_visitor(detail::static_caster<T>(), v);
+}
+
+template <class T, class V>
+const T& static_variant_cast(const V& v)
+{
+ return mapbox::util::apply_visitor(detail::static_caster<const T>(), v);
+}
+}
+}
+
+#endif // VARIANT_CAST_HPP