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Function std.range.interfaces.InputRange.opApply
foreach iteration uses opApply, since one delegate call per loop
iteration is faster than three virtual function calls.
Prototypes
int opApply( int delegate(E) ); int opApply( int delegate(size_t, E) );
Authors
Andrei Alexandrescu, David Simcha, and Jonathan M Davis. Credit for some of the ideas in building this module goes to Leonardo Maffi.