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  1. #include <iostream>
  2. #include <vector>
  3. #include <iterator>
  4. using namespace std;
  5.  
  6. // print a vector
  7. template<typename T1>
  8. std::ostream& operator <<( std::ostream& out, const std::vector<T1>& object )
  9. {
  10.     out << "[";
  11.     if ( !object.empty() )
  12.     {
  13.         //std::copy( object.begin(), --object.end(), std::ostream_iterator<T1>( out, ", " ) );
  14.         for(typename std::vector<T1>::const_iterator t = object.begin(); t != object.end() - 1; ++t) {
  15.         	out << *t << ", ";
  16.         }
  17.         out << *--object.end(); // print the last element separately to avoid the extra characters following it.
  18.     }
  19.     out << "]";
  20.     return out;
  21. }
  22.  
  23. int main()
  24. {
  25.     vector<vector<int> > a;
  26.     vector<int> b;
  27.     //cout << b ; // Works fine for this
  28.     cout << a; // Compiler error
  29. }
Success #stdin #stdout 0s 3140KB
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Standard input is empty
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[]
https://ideone.com/4Wm0nT
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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