Boost C++ Libraries: Ticket #13386: buffered_piece_collection.hpp: parse error in template argument list

awulkiew — Thu, 11 Jan 2018 01:00:23 GMT

I don't think it's a problem in the Boost.Geometry. Looking at the discussion under the other bug report (#13368) it seems that it depends on the compiler and the order of includes. It looks like count is interpreted as a template by the compiler. We could add some workaround but this would be for the problem existing somewhere else. It would be better to find the actual cause.

~~What Boost libraries are you including and in what order?~~

~~Could you experiment with the order of includes in order to find problematic library?~~

EDIT: It seems that it is related with Boost.Range. Code required to reproduce it looks like this:

#include <boost/range/algorithm/count.hpp>
#include <boost/geometry/algorithms/detail/buffer/buffered_piece_collection.hpp>
int main()
{}

awulkiew — Thu, 11 Jan 2018 02:05:25 GMT

Even more distilled sample:

namespace boost {
template <typename T>
void count(T)
{
}
template <typename T>
class A
{
    struct B
    {
        int count;
    };
    void foo()
    {
        B b;
        b.count < 3;
    }
};
}
int main()
{}

It looks like a bug in the compiler.

anonymous — Thu, 11 Jan 2018 16:36:37 GMT

Thanks for the investigation. I found a workaround since its the compiler. update line in buffered_piece_collection.hpp to if (! prop.has_inflated && (prop.count) < 3)

forces the compiler to interpret correctly.

anonymous — Wed, 28 Feb 2018 19:00:22 GMT

bug also occurs with gcc 5.4

anonymous — Mon, 26 Mar 2018 20:58:21 GMT

Seconding that this bug exists in gcc 5.5

status, milestone changed; resolution set

Barend Gehrels — Tue, 27 Mar 2018 19:39:27 GMT

status new → closed
resolution → fixed
milestone To Be Determined → Boost 1.67.0

Fixed, will try to get it into 1.67 Thanks for the report, the analysis and the workaround