fork download
copy 
  1. #include <vector>
  2. #include <iterator>
  3. #include <iostream>
  4.  
  5. template < template<typename...> class Container, typename... Ts>
  6. std::ostream& operator<<(std::ostream& oss, const Container<Ts...>& c) {
  7. 	oss << "[";
  8. 	if (!c.empty()) { // use std::empty() in C++17 and later
  9. 		auto last = std::prev(std::cend(c));
  10.         /*
  11.         using value_type = typename Container<Ts...>::value_type;
  12.         std::copy(std::cbegin(c), last, std::ostream_iterator<value_type>(oss, ","));
  13.         */
  14.         for(auto iter = std::cbegin(c); iter != last; ++iter) 
  15.             oss << *iter << ",";
  16. 		oss << *last;
  17. 	}
  18. 	return oss << "]";
  19. }
  20.  
  21. int main() {
  22. 	std::vector<std::vector<unsigned>> data(5);
  23. 	std::cout << data << std::endl;
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 15240KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
[[],[],[],[],[]]
https://ideone.com/YYHVpH
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!