Return the number of bytes that are guaranteed that can be read before underflow returns eof. If the object is not in a valid state, ‐1 will be returned. Note that often, the actual number of bytes that can be read will be much greater than the value returned by this function.

Synopsis

Declared in <bdlde_utf8checkinginstreambufwrapper.h>

virtual
std::streamsize
showmanyc() override;

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