    const std = @import("../../std.zig");
    const testing = std.testing;
    const math = std.math;
    const cmath = math.complex;
    const Complex = cmath.Complex;

    /// Returns the projection of z onto the riemann sphere.
    pub fn proj(z: anytype) Complex(@TypeOf(z.re)) {
        const T = @TypeOf(z.re);

        if (math.isInf(z.re) or math.isInf(z.im)) {
            return Complex(T).init(math.inf(T), math.copysign(@as(T, 0.0), z.re));
        }

        return Complex(T).init(z.re, z.im);
    }

    const epsilon = 0.0001;

    test "complex.cproj" {
        const a = Complex(f32).init(5, 3);
        const c = proj(a);

        try testing.expect(c.re == 5 and c.im == 3);
    }