Data driven test compile failure when taking a join of grids

[jabenze@…]

The title pretty much says it all. Here's a reproducer:

//main.cpp
#include<boost/test/unit_test.hpp>
#include<boost/test/data/test_case.hpp>

namespace bd = boost::unit_test::data;

BOOST_DATA_TEST_CASE(testname, (bd::make(1) * bd::make(2)) + (bd::make(3) * bd::make(4)), arg1, arg2){}

Produced with gcc 5.2.0 with command line

$ gcc -std=c++14 -c main.cpp -o main.o

[jabenze@…]

Pull request of fix:

​https://github.com/boostorg/test/pull/100

Note that this pull request uses some c++14 features...I saw c++14 features used in grid.hpp (with auto return type) so I went ahead and used them myself. If these changes are in places that support older standards, this pull request won't work as is...just let me know.

[jabenze@…]

It looks like joins of zips are broken in the same way joins of grids are, but this fix should work for both (I didn't actually unfix join to test though, just eyeballing it)

[Raffi Enficiaud]

Pull request breaking other tests. In the current design, joins are not creating any temporary and grids are creating temporary by design.

[Raffi Enficiaud]

Fixed, see #13380