We can't implement an abstract operator=, so it should be "pure virtual", not "silently fail".  ;-)
We can't implement an abstract operator=, so it should be "pure
virtual", not "silently fail".  ;-)


git-svn-id: ffc1bc5b3feaf8644044862cc38c386ade156493@1898 434f946d-2f3d-0410-ba4c-cb9f52fb0dbf

certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh,certik/libmesh