[Boost.Compute]: min_element over a double3 vector sequence

[Manfred Doudar]

Hello List,

Having first tried both the C++ Slack channel, and Boost.Users newsgroup, without much luck I finally landed here - not realizing there was  dedicated Boost.Compute forum.

So, here's the issue -

BOOST_COMPUTE_ADAPT_STRUCT(double3, double3, (x, y, z))

BOOST_COMPUTE_FUNCTION(bool, CompareX, (double3 a, double3 b),

{

    return a.x < b.x;

});

boost::compute::vector<double> points;

...

auto it = boost::compute::min_element(points.begin(), points.end(), CompareX, queue);

which results in the following kernel compilation failure -

--- build log ---

<kernel>:9:3: error: typedef redefinition with different types ('struct double3' vs 'double __attribute__((ext_vector_type(3)))')

} double3;

  ^

cl_kernel.h:154:1: note: previous definition is here

__NV_DECLARE_VECT_TYPES(double,          double)

^

cl_kernel.h:114:61: note: expanded from macro '__NV_DECLARE_VECT_TYPES'

typedef __attribute__(( ext_vector_type(3)  ))        CTYPE CLTYPE##3;  \

                                                            ^

<scratch space>:53:1: note: expanded from here

double3

^

^@

Something obvious I am sure, but guidance would be appreciated.

Thanks,

/M