Oops, m_sources, m_nsources are indeclared.
Also this error: left of '->col' must point to class/struct/union/generic type
-'m_nsources' : undeclared identifier
-'m_sources' : undeclared identifier
-error C2227: left of '->col' must point to class/struct/union/generic type
-left of '->row' must point to class/struct/union/generic type
- 'energySourceAt' : modifiers not allowed on nonmember functions