CPROJ(3) Linux Programmers Manual CPROJ(3)
cproj, cprojf, cprojl - project into Riemann Sphere
double complex cproj(double complex z);
float complex cprojf(float complex z);
long double complex cprojl(long double complex z);
Link with -lm.
This function projects a point in the plane onto the surface of a Rie
mann Sphere, the one-point compactification of the complex plane. Each
finite point z projects to z itself. Every complex infinite value is
projected to a single infinite value, namely to positive infinity on
the real axis.
The glibc implementation is broken and does something entirely differ
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