Function test_set_i

dlib/test/constexpr_if.cpp:180–188

    }

    void test_set_i()
    {
        A a{1};
        D d{1};
        DLIB_TEST(!try_set_i(a, 2));
        DLIB_TEST(a.i == 1);
        DLIB_TEST(try_set_i(d, 2));
        DLIB_TEST(d.i == 2);
    }

    class constexpr_if_test : public tester
    {