guanqun/mongo — comment on commit d93201b29f9062a9a38c3969fd28d053fdff2085
File:  line 0
By dwight:

DiskLoc is no bigger than a pointer so probably fine to pass by value.
In fact i once had a bug in the btree code due to an alias of a DiskLoc's value being modified during recursion; i.e. i think by value very very slightly safer.