Added thirdparty: boost library

thirdparty/include/boost/context/detail/exchange.hpp

@@ -0,0 +1,36 @@
+
+//          Copyright Oliver Kowalke 2014.
+// 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 BOOST_CONTEXT_DETAIL_EXCHANGE_H
+#define BOOST_CONTEXT_DETAIL_EXCHANGE_H
+
+#include <algorithm>
+#include <utility>
+
+#include <boost/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace context {
+namespace detail {
+
+template< typename T, typename U = T >
+T exchange( T & t, U && nv) {
+    T ov = std::move( t);
+    t = std::forward< U >( nv);
+    return ov;
+}
+
+}}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+#include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CONTEXT_DETAIL_EXCHANGE_H