std::complex<> in C++ math special functions: technical specification or proposal

Question

In C++17, mathematical special functions (such as Bessel functions, for example) were added to the standard and are already relatively well supported by modern compilers.

However, those functions are defined for real-valued arguments, while some applications in computational physics heavily use their complex equivalents.

I wonder if

• there is/were any technical specifications/proposals for enhancing std::complex<> with special functions (I was not able to find anything related)
• if such a proposal is in the active state and has a chance for, I guess, C++23
• there are considerations against including special math functions for std::complex<> besides their [relatively] narrow use

Answer 1

I know of no such proposal currently under review.

I would expect such a proposal to come through SG6 (the numerics study group).