MSVC14 - string_view about superiormysqlpp HOT 3 CLOSED

// TODO: change 201701L when optional will become part of standard
#if __cplusplus >= 201701L
#include <string_view>
namespace SuperiorMySqlpp
{
    using StringView = std::string_view;
}
#else
#include <boost/utility/string_view.hpp>

namespace SuperiorMySqlpp
{
    using StringView = boost::string_view;

    inline namespace StringViewLiterals
    {
        inline boost::basic_string_view<char>
            operator""sv(const char* __str, size_t __len)
        {
            return boost::basic_string_view<char>{__str, __len};
        }
        inline boost::basic_string_view<wchar_t>
            operator""sv(const wchar_t* __str, size_t __len)
        {
            return boost::basic_string_view<wchar_t>{__str, __len};
        }
    }
}
#endif