[Dune-devel] [Dune-Commit] [Commit] dune-geometry - cb66db8: Add explicit conversion, needed when using high precision types like boost::multiprecision

[Andreas Buhr]

Hi Martin,

On 06/13/2014 01:28 PM, Martin Nolte wrote:
> Your compiler output
> indicates that you have not tested the option
> 
> ctype dfcxn = (cxn > Traits::tolerance() || cxn < -Traits::tolerance())
> ? df / cxn : ctype(0);
> 
> Does the compiler accept that?

The compiler accepts both:
... ? df / cxn : ctype(0);
and
... ? ctype(df / cxn) : 0;

The reason is that, according to § 5.3 paragraph 3 in the C++ standard
(draft):
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2012/n3337.pdf

<cite>
... if the second and third operand have different types and either has
(possibly cv-qualified) class type, or if both are glvalues of the same
value category and the same type except for cv-qualification, an attempt
is made to convert each of those operands to the type of the other.
</cite>

cheers,
Andreas


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