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Compiler implementation of the D programming language.

Source: sparse.d

class PostorderStatementVisitor: dmd.visitor.StoppableVisitor;
A Statement tree walker that will visit each Statement s in the tree, in depth-first evaluation order, and call fp(s,param) on it. fp() signals whether the walking continues with its return value:
0 continue 1 done It's a bit slower than using virtual functions, but more encapsulated and less brittle. Creating an iterator for this would be much more complex.