1 // 2 // detail/string_view.hpp 3 // ~~~~~~~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2020 Christopher M. Kohlhoff (chris at kohlhoff dot com) 6 // 7 // Distributed under the Boost Software License, Version 1.0. (See accompanying 8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 9 // 10 11 #ifndef BOOST_ASIO_DETAIL_STRING_VIEW_HPP 12 #define BOOST_ASIO_DETAIL_STRING_VIEW_HPP 13 14 #if defined(_MSC_VER) && (_MSC_VER >= 1200) 15 # pragma once 16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) 17 18 #include <boost/asio/detail/config.hpp> 19 20 #if defined(BOOST_ASIO_HAS_STRING_VIEW) 21 22 #if defined(BOOST_ASIO_HAS_STD_STRING_VIEW) 23 # include <string_view> 24 #elif defined(BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW) 25 # include <experimental/string_view> 26 #else // defined(BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW) 27 # error BOOST_ASIO_HAS_STRING_VIEW is set but no string_view is available 28 #endif // defined(BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW) 29 30 namespace boost { 31 namespace asio { 32 33 #if defined(BOOST_ASIO_HAS_STD_STRING_VIEW) 34 using std::basic_string_view; 35 using std::string_view; 36 #elif defined(BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW) 37 using std::experimental::basic_string_view; 38 using std::experimental::string_view; 39 #endif // defined(BOOST_ASIO_HAS_STD_EXPERIMENTAL_STRING_VIEW) 40 41 } // namespace asio 42 } // namespace boost 43 44 # define BOOST_ASIO_STRING_VIEW_PARAM boost::asio::string_view 45 #else // defined(BOOST_ASIO_HAS_STRING_VIEW) 46 # define BOOST_ASIO_STRING_VIEW_PARAM const std::string& 47 #endif // defined(BOOST_ASIO_HAS_STRING_VIEW) 48 49 #endif // BOOST_ASIO_DETAIL_STRING_VIEW_HPP 50