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include/asio/placeholders.hpp

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+//
+// placeholders.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_PLACEHOLDERS_HPP
+#define ASIO_PLACEHOLDERS_HPP
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1200)
+# pragma once
+#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
+
+#include "asio/detail/config.hpp"
+#include "asio/detail/functional.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace placeholders {
+
+#if defined(GENERATING_DOCUMENTATION)
+
+/// An argument placeholder, for use with std::bind() or boost::bind(), that
+/// corresponds to the error argument of a handler for any of the asynchronous
+/// functions.
+unspecified error;
+
+/// An argument placeholder, for use with std::bind() or boost::bind(), that
+/// corresponds to the bytes_transferred argument of a handler for asynchronous
+/// functions such as asio::basic_stream_socket::async_write_some or
+/// asio::async_write.
+unspecified bytes_transferred;
+
+/// An argument placeholder, for use with std::bind() or boost::bind(), that
+/// corresponds to the iterator argument of a handler for asynchronous functions
+/// such as asio::async_connect.
+unspecified iterator;
+
+/// An argument placeholder, for use with std::bind() or boost::bind(), that
+/// corresponds to the results argument of a handler for asynchronous functions
+/// such as asio::basic_resolver::async_resolve.
+unspecified results;
+
+/// An argument placeholder, for use with std::bind() or boost::bind(), that
+/// corresponds to the results argument of a handler for asynchronous functions
+/// such as asio::async_connect.
+unspecified endpoint;
+
+/// An argument placeholder, for use with std::bind() or boost::bind(), that
+/// corresponds to the signal_number argument of a handler for asynchronous
+/// functions such as asio::signal_set::async_wait.
+unspecified signal_number;
+
+#else
+
+static ASIO_INLINE_VARIABLE constexpr auto& error
+  = std::placeholders::_1;
+static ASIO_INLINE_VARIABLE constexpr auto& bytes_transferred
+  = std::placeholders::_2;
+static ASIO_INLINE_VARIABLE constexpr auto& iterator
+  = std::placeholders::_2;
+static ASIO_INLINE_VARIABLE constexpr auto& results
+  = std::placeholders::_2;
+static ASIO_INLINE_VARIABLE constexpr auto& endpoint
+  = std::placeholders::_2;
+static ASIO_INLINE_VARIABLE constexpr auto& signal_number
+  = std::placeholders::_2;
+
+#endif
+
+} // namespace placeholders
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#endif // ASIO_PLACEHOLDERS_HPP