lexical_cast/detail/buffer_view.hpp

0001 // Copyright Antony Polukhin, 2011-2023.
0002 //
0003 // Distributed under the Boost Software License, Version 1.0. (See
0004 // accompanying file LICENSE_1_0.txt or copy at
0005 // http://www.boost.org/LICENSE_1_0.txt)
0006
0007 #ifndef BOOST_LEXICAL_CAST_DETAIL_BUFFER_VIEW_HPP
0008 #define BOOST_LEXICAL_CAST_DETAIL_BUFFER_VIEW_HPP
0009
0010 #include <boost/config.hpp>
0011 #ifdef BOOST_HAS_PRAGMA_ONCE
0012 #   pragma once
0013 #endif
0014
0015 #include <iosfwd>
0016
0017 namespace boost { namespace conversion { namespace detail {
0018
0019     template < typename CharT >
0020     struct buffer_view {
0021         const CharT* begin;
0022         const CharT* end;
0023     };
0024
0025     template < typename CharT >
0026     buffer_view<CharT> make_buffer_view(const CharT* begin, const CharT* end) {
0027         return buffer_view<CharT>{begin, end};
0028     }
0029
0030     inline buffer_view<char> make_buffer_view(const signed char* begin, const signed char* end) {
0031         return buffer_view<char>{
0032             reinterpret_cast<const char*>(begin),
0033             reinterpret_cast<const char*>(end)
0034         };
0035     }
0036
0037     inline buffer_view<char> make_buffer_view(const unsigned char* begin, const unsigned char* end) {
0038         return buffer_view<char>{
0039             reinterpret_cast<const char*>(begin),
0040             reinterpret_cast<const char*>(end)
0041         };
0042     }
0043
0044     template< typename CharT, typename Elem, typename Traits >
0045     std::basic_ostream<Elem,Traits>& operator<<(
0046                 std::basic_ostream<Elem, Traits>& os,
0047                 buffer_view<CharT> r)
0048     {
0049         while (r.begin != r.end) {
0050           os << r.begin[0];
0051           ++r.begin;
0052         }
0053         return os;
0054     }
0055
0056 }}}  // namespace boost::conversion::detail
0057
0058 #endif // BOOST_LEXICAL_CAST_DETAIL_BUFFER_VIEW_HPP
0059