c++ - How to specify shared template variable with two template template parameters? -


i'm trying build mini test framework. have 1 function takes in 2 list-like variables composed of same type , plan on using template template parameters part of interface. far, have this,

    template <typename c, template <class> class a, template <class> class b>     static inline void assertequals(const a<c>& expected, const b<c>& actual) {       auto success = 0, failure = 0;        (auto iter1 = expected.cbegin(), iter2 = actual.cbegin();            iter1 != expected.cend() && iter2 != actual.cend(); ++iter1, ++iter2) {         if (test::assertequals<c>(*iter1, *iter2)) {           ++success;         } else {           ++failure;         }       }        cout << "success: " << success << endl            << "failure: " << failure << endl;     }

the assertequals in if condition function. question is, interface correct? secondly, how use it? i've tried no avail,

    test::assertequals<int, std::vector, std::vector>(haystack, needle);

test:: class function resides in , haystack , needle of type std::vector<int>.

your interface won't accept std::vector, because takes 2 template arguments: contained type , allocator.

you change template signature accept variadic template templates, this:

template <typename c, template <class...> class a, template <class...> class b> static inline void assertequals(const a<c>& expected, const b<c>& actual) {

or set default parameter explicitly:

template <typename c,            template <class, class = std::allocator<c>> class a,            template <class, class = std::allocator<c>> class b>     void assertequals(const a<c>& expected, const b<c>& actual) {

however, you're better off getting c stl container member types, this:

template <class a, class b> void assertequals(const a& expected, const b& actual) {     static_assert(std::is_same<typename a::value_type, typename b::value_type>::value,                   "containers must have same value type");     using c = typename a::value_type;     //...

this more simple interface. of above options, compiler can deduce template arguments you, call like:

assertequals(haystack, needle);

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