Compile fails with anonymous namespace CUB_NS_PREFIX

[llehtahw]

reproduce:

#define CUB_NS_PREFIX namespace {
#define CUB_NS_POSTFIX }
#include <cub/cub.cuh>
int main()
{
        int res = (int)cub::Equals<int, int>::VALUE;
        return res;
}

/workspace/abc/a.cu(6): error: "cub" is ambiguous

/workspace/abc/a.cu(6): error: expected an identifier

/workspace/abc/a.cu(6): error: expected a ";"

Seems that these lines introduced the errors.

[alliepiper]

Can confirm:

1.8.0: https://www.godbolt.org/z/fjrP7K
main: https://www.godbolt.org/z/4K98Pc

We'll also need to add a test for this.

[elstehle]

I believe this is due to this one here. The doxygen declaration just ignores the macro.

cub/cub/util_namespace.cuh

Lines 52 to 59 in ea48955

	/*! \namespace cub
	* \brief \p cub is the top-level namespace which contains all CUB
	* functions and types.
	*/
	namespace cub
	{
	}

I have had a fix for this a few months ago but forgot to push upstream. It got lost with repo move now. I can contribute later tonight, unless you want to take it on, @allisonvacanti

[alliepiper]

Awesome -- Contributions are more than welcome. I probably wouldn't get to this for a couple of days, so if you have a branch ready to push, go for it :)