std::size_t helper_tests::pagesize = 0;
std::unique_ptr<PageStore> helper_tests::store = nullptr;
void* helper_tests::data = nullptr;
std::size_t helper_tests::pagesize = 0;
std::unique_ptr<PageStore> helper_tests::store = nullptr;
void* helper_tests::data = nullptr;
-size_t helper_tests::pageno[4] = {0, 0, 0, 0};
+std::array<size_t, 4> helper_tests::pageno = {{0, 0, 0, 0}};