Returns true, if the documentation output is currently being estimated by the generator.

The generation of the whole documentation consists of two phases -- the estimation phase and the generation phase.

In the estimation phase, the generator quickly passes over all the source data and partially interprets the involved templates. During that, it collects the names and location of all documentation files to be created and all possible hypertarget locations within them. It also makes an estimation of the total generation time in order to graduate the progress bar.

During the generation phase, all template components are being fully interpreted and the real output generated.

Normally, this property is not necessary to be used in any settings of template components. The only situation when this may be required is when using one of the following functions: