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