|Re: [eigen] Custom complex type|
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May be this page can help:
At Tue, 7 Jun 2011 15:04:37 +0900,
Pavel Holoborodko wrote:
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> 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 MPC.
> 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 Eigen?
> If yes, do I need to provide something besides NumTraits<std::complex<mpreal> > specialization?
> Thanks in advance,