Function spy

Utilities/cmcppdap/src/io.cpp:233–237

spy() returns a Reader that copies all reads from the Reader r to the Writer s, using the given optional prefix.

// spy() returns a Reader that copies all reads from the Reader r to the Writer
// s, using the given optional prefix.
std::shared_ptr<Reader> spy(const std::shared_ptr<Reader>& r,
                            const std::shared_ptr<Writer>& s,
                            const char* prefix /* = "\n<-" */) {
  return std::make_shared<ReaderSpy>(r, s, prefix);
}

// spy() returns a Writer that copies all writes to the Writer w to the Writer
// s, using the given optional prefix.