//
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// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// Official repository: https://github.com/boostorg/json
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//
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#ifndef BOOST_JSON_STRING_VIEW_HPP
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#define BOOST_JSON_STRING_VIEW_HPP
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#include <boost/json/detail/config.hpp>
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#ifndef BOOST_JSON_STANDALONE
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# include <boost/utility/string_view.hpp>
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#else
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# if __has_include(<string_view>)
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# include <string_view>
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# if __cpp_lib_string_view < 201603L
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# error Support for std::string_view is required to use Boost.JSON standalone
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# endif
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# else
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# error Header <string_view> is required to use Boost.JSON standalone
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# endif
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#endif
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#include <type_traits>
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BOOST_JSON_NS_BEGIN
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#ifdef BOOST_JSON_DOCS
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/** The type of string view used by the library.
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This type alias is set depending
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on how the library is configured:
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@par Use with Boost
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If the macro `BOOST_JSON_STANDALONE` is
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not defined, this type will be an alias
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for `boost::string_view`.
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Compiling a program using the library will
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require Boost, and a compiler conforming
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to C++11 or later.
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@par Use without Boost
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If the macro `BOOST_JSON_STANDALONE` is
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defined, this type will be an alias
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for `std::string_view`.
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Compiling a program using the library will
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require only a compiler conforming to C++17
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or later.
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@see https://en.cppreference.com/w/cpp/string/basic_string_view
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*/
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using string_view = __see_below__;
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#elif ! defined(BOOST_JSON_STANDALONE)
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using string_view = boost::string_view;
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#else
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using string_view = std::string_view;
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#endif
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namespace detail {
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template<class T>
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using is_string_viewish = typename std::enable_if<
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std::is_convertible<
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T const&, string_view>::value &&
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! std::is_convertible<
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T const&, char const*>::value
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>::type;
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} // detail
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BOOST_JSON_NS_END
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#endif
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