void operator()(output_type& _out, const segment_type& _a, JUNCTION _j)
{
if (_out.empty())
{
_out.push_back(_a.front());
_out.push_back(_a.back());
return;
}
_j(_out,_a,_out);
_out.push_back(_a.back());
}
void operator()(const segment_type& _a, const linestring_type& _b, output_type& _out, JUNCTION _j)
{
if (_b.empty())
{
_out.push_back(_a.front());
_out.push_back(_a.back());
return;
}
_out.push_back(_a.front());
_j(_a,_b,_out);
_out.insert(_out.end(),_a.begin()+1,_a.end());
}
void operator()(const segment_type& _a, const segment_type& _b, output_type& _output, JUNCTION _j)
{
JUNCTION(_a,_b,_output);
_output.push_back(_b.back());
}