line_iterator_impl.hpp

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/******************************************************************************
** Copyright © 2020 by J.M.McGuiness, coder@hussar.me.uk & M.Waplington
**
** This library is free software; you can redistribute it and/or
** modify it under the terms of the GNU Lesser General Public
** License as published by the Free Software Foundation; either
** version 2.1 of the License, or (at your option) any later version.
**
** This library is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** Lesser General Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with this library; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
 
namespace jmmcg { namespace LIBJMMCG_VER_NAMESPACE {
 
inline
line_iterator::line_iterator(std::istream &s) noexcept(false)
: in_(&s) {
   read();
}
 
inline line_iterator::reference
line_iterator::operator*() const noexcept(true) {
   return line_;
}
 
inline line_iterator::pointer
line_iterator::operator->() const noexcept(true) {
   return &line_;
}
 
inline line_iterator
line_iterator::operator++() noexcept(false) {
   read();
   return *this;
}
 
inline line_iterator
line_iterator::operator++(int) noexcept(false) {
   line_iterator tmp=*this;
   read();
   return tmp;
}
 
inline bool
line_iterator::operator==(line_iterator const& i) const noexcept(true) {
   return (in_==i.in_ && valid_==i.valid_)
      || (!valid_ && !i.valid_);
}
 
inline bool
line_iterator::operator!=(line_iterator const& i) const noexcept(true) {
   return !(*this==i);
}
 
inline void
line_iterator::read() noexcept(false) {
   if (in_) {
      std::getline(*in_, line_);
   }
   valid_=static_cast<bool>(*in_);
}
 
} }