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double complex cproj(double complex z);
float complex cprojf(float complex z);
long double complex cprojl(long double complex z);
Link with -lm.
These functions project 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.
These functions first appeared in glibc in version 2.1.
Multithreading (see pthreads(7))
The cproj(), cprojf(), and cprojl() functions are thread-safe.
In glibc 2.11 and earlier, the implementation does something different
(a stereographic projection onto a Riemann Sphere).