[GiNaC-list] Compiling GiNaC on OS X

Richard B. Kreckel kreckel at ginac.de
Wed Oct 23 23:53:28 CEST 2013


On 10/23/2013 09:42 AM, Stefan Schupp wrote:
> Upon invoking make I get an error regarding an ambiguous conversion in
> multiple lines:
> inifcns_nstdsums.cpp:2604:18: error: ambiguous conversion for
> functional-style cast from 'int' to 'lst' (aka 'container<std::list>')
>                 return e * (-H(lst(0),1/arg).hold());
>                                ^~~~~
> ./container.h:145:2: note: candidate constructor
>         container(STLT const & s, bool discardable = false)
>         ^
> ./container.h:167:11: note: candidate constructor
>         explicit container(const ex & p1)
> All errors are in the above file inifcns_nstdsums.cpp and occur with the
> same cast:
> H(lst(0),1/arg).hold()
> From the error message I can conclude that there are two constructors
> applyable - which one is the correct one? E.g. casting 0 to ex (changing
> the line to: H(lst( ex(0) ),1/arg).hold() solves the error - is this the
> correct cast or is the other cast the correct one?

According to the manual, the harmonic polylogarithm H expects a general
lst as first argument. So, lst(ex(0)) is correct and lst(int(0)) would
be incorrect.

But I wonder why this clarification is needed. IMHO, the first candidate
shouldn't be considered, if the std::list<T>(T) ctor is explicit, or am
I missing something?

Does the attached patch work for you?

Richard B. Kreckel
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