Initial Commit

include/asio/experimental/cancellation_condition.hpp

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+//
+// experimental/cancellation_condition.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+//
+// 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 ASIO_EXPERIMENTAL_CANCELLATION_CONDITION_HPP
+#define ASIO_EXPERIMENTAL_CANCELLATION_CONDITION_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/cancellation_type.hpp"
+#include "asio/disposition.hpp"
+#include "asio/detail/type_traits.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace experimental {
+
+/// Wait for all operations to complete.
+class wait_for_all
+{
+public:
+  template <typename... Args>
+  constexpr cancellation_type_t operator()(Args&&...) const noexcept
+  {
+    return cancellation_type::none;
+  }
+};
+
+/// Wait until an operation completes, then cancel the others.
+class wait_for_one
+{
+public:
+  constexpr explicit wait_for_one(
+      cancellation_type_t cancel_type = cancellation_type::all)
+    : cancel_type_(cancel_type)
+  {
+  }
+
+  template <typename... Args>
+  constexpr cancellation_type_t operator()(Args&&...) const noexcept
+  {
+    return cancel_type_;
+  }
+
+private:
+  cancellation_type_t cancel_type_;
+};
+
+/// Wait until an operation completes without an error, then cancel the others.
+/**
+ * If no operation completes without an error, waits for completion of all
+ * operations.
+ */
+class wait_for_one_success
+{
+public:
+  constexpr explicit wait_for_one_success(
+      cancellation_type_t cancel_type = cancellation_type::all)
+    : cancel_type_(cancel_type)
+  {
+  }
+
+  constexpr cancellation_type_t
+  operator()() const noexcept
+  {
+    return cancel_type_;
+  }
+
+  template <typename E, typename... Args>
+  constexpr constraint_t<!is_disposition<E>::value, cancellation_type_t>
+  operator()(const E&, Args&&...) const noexcept
+  {
+    return cancel_type_;
+  }
+
+  template <typename E, typename... Args>
+  constexpr constraint_t<is_disposition<E>::value, cancellation_type_t>
+  operator()(const E& e, Args&&...) const noexcept
+  {
+    return e != no_error ? cancellation_type::none : cancel_type_;
+  }
+
+private:
+  cancellation_type_t cancel_type_;
+};
+
+/// Wait until an operation completes with an error, then cancel the others.
+/**
+ * If no operation completes with an error, waits for completion of all
+ * operations.
+ */
+class wait_for_one_error
+{
+public:
+  constexpr explicit wait_for_one_error(
+      cancellation_type_t cancel_type = cancellation_type::all)
+    : cancel_type_(cancel_type)
+  {
+  }
+
+  constexpr cancellation_type_t operator()() const noexcept
+  {
+    return cancellation_type::none;
+  }
+
+  template <typename E, typename... Args>
+  constexpr constraint_t<!is_disposition<E>::value, cancellation_type_t>
+  operator()(const E&, Args&&...) const noexcept
+  {
+    return cancellation_type::none;
+  }
+
+  template <typename E, typename... Args>
+  constexpr constraint_t<is_disposition<E>::value, cancellation_type_t>
+  operator()(const E& e, Args&&...) const noexcept
+  {
+    return e != no_error ? cancel_type_ : cancellation_type::none;
+  }
+
+private:
+  cancellation_type_t cancel_type_;
+};
+
+} // namespace experimental
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_EXPERIMENTAL_CANCELLATION_CONDITION_HPP