Re: [Boost-users] multiprecision -- eigen matrices using dynamically allocated variable-precision mpfr_float

Subject: Re: [Boost-users] multiprecision -- eigen matrices using dynamically allocated variable-precision mpfr_float
From: Daniel Brake (danielthebrake_at_[hidden])
Date: 2015-04-16 15:15:12

> Never mind, false lead anyway - there's a bug in the assignment operator
of mpfr_float_backend - the operator:

thanks for researching this, John!

> mpfr_float_backend& operator=(const mpfr_float_backend& o)
>
> Needs to be a no-op in the case of self-assignment, otherwise the call to
mpfr_set_prec sets the value to NaN, even though the precision and value
doesn't actually change in this case :(
>
> There'll be an official patch shortly, but I need to wait for the revised
tests to complete first (to make sure they catch this).

I have four questions regarding a patch. Please pardon if they are trivial,
but this seems like the quickest way to receive answers, and searches
didn't reveal the answers for me.

1) Do I need to do anything to report this bug, or has a report on this one
been filed?  2) Will the patch be contained in the 1.58 release?  3) If
not, once a patch for this bug is released, will the patch show up in
http://www.boost.org/patches/ ?  And one last question -- 4) Is there a way
to detect whether a patch has been applied, and refuse to compile my
program if it hasn't?

Thanks a ton for the help, I truly appreciate it.

Daniel