Function parsePolygon

source/MRMesh/MRIOParsing.cpp:333–365

}

Expected<void> parsePolygon( const std::string_view& str, VertId* vertId, int* numPoints)
{
    using namespace boost::spirit::x3;

    bool r = false;
    size_t vi = 0;
    auto v = [&] ( auto& ctx ) { vertId[vi++] = VertId( _attr( ctx ) ); };
    if ( numPoints )
    {
        auto n = [&] ( auto& ctx ) { *numPoints = _attr( ctx ); };
        r = phrase_parse(
            str.begin(),
            str.end(),
            int_[n] >> *int_[v],
            ascii::space );
    }
    else
    {
        auto n = [&] ( auto& ) { };
        r = phrase_parse(
            str.begin(),
            str.end(),
            int_[n] >> *int_[v],
            ascii::space );
    }

    if ( !r )
    {
        return unexpected( "Failed to parse face in OFF-file" );
    }

    return {};
}

bool hasBom( const std::string_view& str )
{