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ios::operator void*

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operator void* () const;

An operator that converts a stream to a pointer that can be compared to 0.

Return Value

The conversion returns 0 if either failbit or badbit is set in the stream’s error state. See rdstate for a description of the error state masks. A nonzero pointer is not meant to be dereferenced.

ios Overview |  Abstract Stream Base Class

See Also   ios::good, ios::fail