Method map

include/geode/basic/mapping.hpp:199–210

        GenericMapping& operator=( GenericMapping&& ) noexcept = default;

        void map( const T1& in, const T2& out )
        {
            if( this->has_mapping_input( in ) )
            {
                if( absl::c_contains( this->in2out( in ), out ) )
                {
                    return;
                }
            }
            this->in2out_mapping()[in].push_back( out );
            this->out2in_mapping()[out].push_back( in );
        }

        void unmap( const T1& in, const T2& out )
        {