No matching constructor for initalization of 'ostream_iterator'

Question

for the code, why error, osteam_iterator is a template class ,why no matching constructor for initalization of \'ostream_iterator\', please give a help , thank you. define o

Answer 1

The ostream_iterator class definition looks like:

template< class T,
  class CharT = char,
  class Traits = std::char_traits>
class ostream_iterator /*...*/

whereas the respective constructor is declared as:

ostream_iterator(ostream_type& buffer, const CharT* delim)

Since the second template argument of an ostream_iterator is required to be of character type you cannot simply replace it with int.

If you ommit the second template parameter you can plug in a string literal of type char const *:

std::copy(sentence1.begin(), sentence1.end(), std::ostream_iterator(cout, ","));

If C++11 is available to you then

int c = 5;
for ( auto v : sentence1 ) std::cout << v << c;

is another way of doing what you deserve and it might be suitable, too. The advantage is, that operator<< is more flexible than an argument of type "pointer to char type".