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8.2.4 _gfortran_caf_num_images — Querying the maximal number of images

Description:
This function returns the number of images in the current team, if distance is 0 or the number of images in the parent team at the specified distance. If failed is -1, the function returns the number of all images at the specified distance; if it is 0, the function returns the number of nonfailed images, and if it is 1, it returns the number of failed images.
Syntax:
int _gfortran_caf_num_images(int distance, int failed)
Arguments:

distance the distance from this image to the ancestor. Shall be positive.
failed shall be -1, 0, or 1

NOTES
This function follows TS18508. If the num_image intrinsic has no arguments, the the compiler passes distance=0 and failed=-1 to the function.