string_view.hpp

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// Copyright Takatoshi Kondo 2016
//
// 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)
 
#if !defined(MQTT_STRING_VIEW_HPP)
#define MQTT_STRING_VIEW_HPP
 
#include <mqtt/namespace.hpp>
 
#ifdef MQTT_STD_STRING_VIEW
 
#include <string_view>
 
namespace MQTT_NS {
 
using std::string_view;
 
using std::basic_string_view;
 
} // namespace MQTT_NS
 
#else  // MQTT_STD_STRING_VIEW
 
#include <boost/version.hpp>
 
#if !defined(MQTT_NO_BOOST_STRING_VIEW)
 
#if BOOST_VERSION >= 106100
 
#define MQTT_NO_BOOST_STRING_VIEW 0
 
#include <boost/utility/string_view.hpp>
#include <boost/container_hash/hash_fwd.hpp>
 
namespace MQTT_NS {
 
using string_view = boost::string_view;
 
template<class CharT, class Traits = std::char_traits<CharT> >
using basic_string_view = boost::basic_string_view<CharT, Traits>;
 
} // namespace MQTT_NS
 
#if BOOST_VERSION < 106900
namespace boost {
template <class charT, class traits>
std::size_t hash_value(basic_string_view<charT, traits> s) {
    return hash_range(s.begin(), s.end());
}
}
 
#endif // BOOST_VERSION < 106900
 
#else  // BOOST_VERSION >= 106100
 
#define MQTT_NO_BOOST_STRING_VIEW 1
 
#include <boost/utility/string_ref.hpp>
 
namespace MQTT_NS {
 
using string_view = boost::string_ref;
 
template<class CharT, class Traits = std::char_traits<CharT> >
using basic_string_view = boost::basic_string_ref<CharT, Traits>;
 
} // namespace MQTT_NS
 
#endif // BOOST_VERSION >= 106100
 
 
#endif // !defined(MQTT_NO_BOOST_STRING_VIEW)
 
#endif // !defined(MQTT_STD_STRING_VIEW)
 
#endif // MQTT_STRING_VIEW_HPP