On Tue, Jun 7, 2011 at 8:04 AM, Pavel Holoborodko <pavel@xxxxxxxxxxxxxxx
> Eigen's magicians, please advise on how to implement custom complex type for
> smooth integration with Eigen.
> I plan to create multi-precision C++ complex scalar class based on
> MPC: http://www.multiprecision.org/index.php?prog=mpc
> MPC is cousin of MPFR from the same authors - http://mpfr.org
> There are two possible ways to proceed:
> (1). Add template specialization for std::complex<mpfr::mpreal>.
> (2). Create own scalar class something like mpcomplex based on low-level
> Second option seems attractive from optimization point of view - minimum
> overhead, no conversion mpreal <-> MPC low level stuff is required.
> There is only one problem - will it be possible to integrate such complex
> type with Eigen?
> Documentation on NumTraits says:
> "An enum value IsComplex. It is equal to 1 if T is a std::complex type, and
> to 0 otherwise."
> Does it mean that only std::complex<T> custom complex types are supported in
> If yes, do I need to provide something besides
> NumTraits<std::complex<mpreal> > specialization?
> Thanks in advance,