Re: fusion vector, spirit, phoenix actor and forwarding constructor

On Sun, 17 Jul 2016 14:54:15 +0900
Kohei Takahashi <[email protected]> wrote:

> MM,
> 
> 
> >     While trying to make a smaller case, I've ran into I suppose a
> >     separate problem (likely unrelated) here:
> >
> >     https://stackoverflow.com/questions/38372392/boost-phoenix-eval-failures
> >
> >     The line closest to my real-code line that triggers the error
> >     above is:
> >
> >     start_ %= g2_(_r1);
> >
> >     Lee, here is a more complete stack that gets triggered from my
> >     real code:
> >
> >     startrule %= start(_r1);
> >     qis::rule<Iterator, T*(T*), qis::blank_type> startrule;
> >     qis::rule<Iterator, T*(T*), qis::locals<X*>, qis::blank_type>
> > start; /// where T and X are my application types.
> >     The error stack is here:
> >
> >     http://paste.fedoraproject.org/391037/46849462
> >     http://paste.fedoraproject.org/391037/46849462
> >     Lee, let me know what to test please? Thanks
> >
> >
> >     MM
> >
> >
> > I managed to have a reproducible case and I updated the 
> > https://stackoverflow.com/questions/38372392/boost-phoenix-eval-failures
> > with the code.
> 
> Thank you for your investigation. I'll check it.
> 

Someone sent me a more limited failure case:

    int main() {
        auto iter = boost::phoenix::val(str.begin());
        boost::fusion::make_vector(iter);
    }

This was caused entirely by my last patch, which is found only on the
develop branch. If the OP had errors with Boost 1.60-1.61 it is likely
a separate but related issue that I attempted to fix in my patch.

Kohei - I started investigating the problem before this thread started
after I discovered the issue myself. Eventually I started
[experimenting with `fusion::vector`][0]. I do not plan on merging that
branch directly; there is a lot going on and some of the changes
intended for compile time performance have not been analyzed. Instead, I
will start with smaller patches, with the focus being [adding SFINAE to
the tuple and vector constructors][1]. Email me directly if you have
any different thoughts on fixing this.

Lee

[0]https://github.com/boostorg/fusion/compare/develop...vtnerd:experimental/vector
[1]https://github.com/boostorg/fusion/compare/develop...vtnerd:experimental/vector#diff-685c7cd829c2781da56b16d34a35526dR300

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