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A depth-first visitor for expressions.

Source apply.d

int apply(FP, Params...)(Dsymbol symbol, FP fp, Params params);
Iterate this dsymbol or members of this scoped dsymbol, then call fp with the found symbol and params.
Dsymbol symbol the dsymbol or parent of members to call fp on
FP fp function pointer to process the iterated symbol. If it returns nonzero, the iteration will be aborted.
Params params any parameters passed to fp.
nonzero if the iteration is aborted by the return value of fp, or 0 if it's completed.