Free User-Defined Extractors and Inserters in C++ Tutorial

“>Whether we're reading objects from files or sending them acrossnetworks, we want the process to be as painless and transparent as possible.Ideally, we'd like to be able to change the source from which we'regetting an object or the destination where we're sending anobject—without major changes to the code in either case. Further, we wantthe processes of reading, writing, storing, and retrieving objects, whetherbuilt-in or user-defined, to be basically the sam 
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