Added thirdparty: boost library

thirdparty/include/boost/cobalt/detail/leaf.hpp

@@ -0,0 +1,86 @@
+// Copyright (c) 2023 Klemens D. Morgenstern
+//
+// 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_COBALT_DETAIL_LEAF_HPP
+#define BOOST_COBALT_DETAIL_LEAF_HPP
+
+#include <boost/cobalt/detail/await_result_helper.hpp>
+#include <boost/leaf/config.hpp>
+#include <boost/leaf/capture.hpp>
+#include <boost/leaf/handle_errors.hpp>
+
+namespace boost::cobalt::detail
+{
+
+template<typename Awaitable, typename ... H>
+struct [[nodiscard]] try_catch_awaitable
+{
+  Awaitable aw;
+  std::tuple<H...> handler;
+
+  bool await_ready() {return aw.await_ready(); }
+  template<typename Promise>
+  auto await_suspend(std::coroutine_handle<Promise> h) {return aw.await_suspend(h);}
+
+  auto await_resume()
+  {
+    return std::apply(
+        [this](auto && ... h)
+        {
+          return leaf::try_catch(
+              [this]{return std::move(aw).await_resume();},
+              std::move(h)...);
+        }, std::move(handler));
+  }
+};
+
+template<typename Awaitable, typename ... H>
+struct [[nodiscard]] try_handle_all_awaitable
+{
+  Awaitable aw;
+  std::tuple<H...> handler;
+
+  bool await_ready() {return aw.await_ready(); }
+  template<typename Promise>
+  auto await_suspend(std::coroutine_handle<Promise> h) {return aw.await_suspend(h);}
+
+  auto await_resume()
+  {
+    return std::apply(
+        [this](auto && ... h)
+        {
+          return leaf::try_handle_all(
+              [this]{return std::move(aw).await_resume();},
+              std::move(h)...);
+        }, std::move(handler));
+  }
+};
+
+
+
+template<typename Awaitable, typename ... H>
+struct [[nodiscard]] try_handle_some_awaitable
+{
+  Awaitable aw;
+  std::tuple<H...> handler;
+
+  bool await_ready() {return aw.await_ready(); }
+  template<typename Promise>
+  auto await_suspend(std::coroutine_handle<Promise> h) {return aw.await_suspend(h);}
+
+  auto await_resume()
+  {
+    return std::apply(
+        [this](auto && ... h)
+        {
+          return leaf::try_handle_some(
+              [this]{return std::move(aw).await_resume();},
+              std::move(h)...);
+        }, std::move(handler));
+  }
+};
+
+}
+
+#endif //BOOST_COBALT_DETAIL_LEAF_HPP