Added thirdparty: boost library

thirdparty/include/boost/fusion/view/identity_view/identity_view.hpp

@@ -0,0 +1,50 @@
+/*=============================================================================
+    Copyright (c) 2022 Denis Mikhailov
+    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)
+==============================================================================*/
+
+#if !defined(BOOST_FUSION_IDENTITY_VIEW_HPP_INCLUDED)
+#define BOOST_FUSION_IDENTITY_VIEW_HPP_INCLUDED
+
+#include <boost/fusion/support/config.hpp>
+#include <boost/fusion/view/transform_view.hpp>
+#include <boost/functional/identity.hpp>
+#include <boost/utility/result_of.hpp>
+
+namespace boost { namespace fusion {
+    namespace detail {
+        struct identity : boost::identity
+        {
+        };
+    }
+}}
+
+namespace boost {
+    template<typename T>
+    struct result_of<fusion::detail::identity(T)>
+    {
+        typedef T type;
+    };
+}
+
+#ifdef _MSC_VER
+#  pragma warning(push)
+#  pragma warning(disable: 4512) // assignment operator could not be generated.
+#endif
+namespace boost { namespace fusion {
+    template<typename Sequence> struct identity_view 
+        : transform_view<Sequence, detail::identity>
+    {
+        typedef transform_view<Sequence, detail::identity> base_type;
+
+        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+        identity_view(Sequence& in_seq)
+            : base_type(in_seq, detail::identity()) {}
+    };
+}}
+#ifdef _MSC_VER
+#  pragma warning(pop)
+#endif
+
+#endif