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Evaluates the formatter
object.
bool formatter::operator !();
None
Returns true
if it's specified output file/stream is valid and open, false
otherwise.
This operation is used to verify the state of formatter's
internal output stream. The output stream/file is specified in formatter's
constructor. If a file or stream is specified which is not opened or in a bad state, this operation will return false. If the stream or file is open
and in a good state, the operation will return true.
This operation is handy for verifying the state of the formatter
object before using it to format and output document's
or markup
objects.
Constant