cprojl − project into Riemann Sphere
complex cproj(double complex z);
float complex cprojf(float complex z);
long double complex cprojl(long double complex
project a point in the plane onto the surface of a Riemann
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
first appeared in glibc in version 2.1.
explanation of the terms used in this section, see
In glibc 2.11
and earlier, the implementation does something different (a
stereographic projection onto a Riemann Sphere).
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