Is there a way to test nontype templates using Boost Test?

Question

I am using Boost Unit Test to perform unit test for my project. I need to test some non-type templates, however seems that using the macro BOOST_AUTO_TEST_CASE_TEMPLATE(test_case_name, formal_type_parameter_name, collection_of_types) I can test only typed templates. I want to use a collection_of_types not composed by { int, float, ...}, but {0,1,2, ...}.

Here an example of what I want to do:

#include <boost/test/included/unit_test.hpp>
#include <boost/mpl/list.hpp>

typedef boost::mpl::list<0, 1, 2, 4, 6> test_types;

BOOST_AUTO_TEST_CASE_TEMPLATE( my_test, T, test_types )
{
  test_template<T>* test_tmpl = new test_template<T>();

  // other code
}

Answer 1

You can always wrap static constants in a type. For integral types there is std::integral_constant or indeed the Boost MPL analog:

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#define BOOST_TEST_MODULE sotest
#define BOOST_TEST_MAIN

#include <boost/mpl/list.hpp>
#include <boost/test/included/unit_test.hpp>

template <int> struct test_template {};

typedef boost::mpl::list<
    boost::mpl::integral_c<int, 0>,
    boost::mpl::integral_c<int, 1>,
    boost::mpl::integral_c<int, 2>,
    boost::mpl::integral_c<int, 4>,
    boost::mpl::integral_c<int, 6>
> test_types;

BOOST_AUTO_TEST_CASE_TEMPLATE(my_test, T, test_types) {
    test_template<T::value>* test_tmpl = new test_template<T::value>();

    // other code
    delete test_tmpl;
}

Prints

Running 5 test cases...

*** No errors detected

BONUS Tip

To save on typing you can use a variadic template alias:

template <typename T, T... vv> using vlist =
    boost::mpl::list<boost::mpl::integral_c<T, vv>... >;

Now you can define the list as:

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using test_types = vlist<int, 0, 1, 2, 4, 6>;