Thread: ostream_iterator<string>(cout," ")

Code:

copy(sentence.begin(),sentence.end(),
       ostream_iterator<string>(cout," "));
  cout << endl;

error

26 C:\Dev-Cpp\vector1\main.cpp
`ostream_iterator' undeclared (first use this function)

I took this example directly from a book and do not know why this line gives me problems. Can anyone help?

I'm using Dev_Cpp ver.4.9.8

From the error code I guess this iterator is not "included"
Here is the entire example:

Code:

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <stdlib.h>

using namespace std;

int main(int argc, char *argv[])
{
  //create an empty vector for strings
  vector<string> sentence;
  
  //reserve memory for 5 elements to avoid reallocation
  sentence.reserve(5);
  
  //append some elements
  sentence.push_back("Hello, ");
  sentence.push_back("how");
  sentence.push_back("are");
  sentence.push_back("you");
  sentence.push_back("?");
  
  //print elements seperated with spaces
  copy(sentence.begin(),sentence.end(),
       ostream_iterator<string>(cout," "));
  cout << endl;
  
  //print statistics
  cout << "   max_size(): "<<sentence.max_size()<<endl;
  cout << "   size():     "<<sentence.size()<<endl;
  cout << "   capacity(): "<<sentence.capacity()<<endl;
  
  //swap second and fourth element
  swap(sentence[1],sentence[3]);
  
  //insert element "always" before element "?"
  sentence.insert(find(sentence.begin(),sentence.end(),"?"),"always");
  
  //assign "!" to the last element
  sentence.back()="!";
  
  //print elements seperated by spaces
  copy(sentence.begin(),sentence.end(),
       ostream_iterator<string>(cout," "));
  cout << endl;
  
  //print statistics
  cout << "   max_size(): "<<sentence.max_size()<<endl;
  cout << "   size():     "<<sentence.size()<<endl;
  cout << "   capacity(): "<<sentence.capacity()<<endl;
  
  system("PAUSE");	
  return 0;
}

Originally posted by curlious

From the error code I guess this iterator is not "included"

Jepp,include <iterator>

BTW thanks I included <iterator> and that fixed the problem strange, the example in The C++ Standard Library a tutorial and refrence by Nicholi M. Josuttis (6.2.5 pg156) doesn't include the library. Guess it's an error on their part.

Maybe you use a newer version. It was premature to blame it on an error in the book w/o more feed back from those who know more about the compiler.

Originally posted by curlious
Maybe you use a newer version. It was premature to blame it on an error in the book w/o more feed back from those who know more about the compiler.

The 100% correct way is to include iterator.
Dinkumware C++ Reference http://www.dinkumware.com/manuals/re...=iterator.html (click on the logo).

In your code you include string,iostream,vector and algorithm,but none of these must include iterator.
It depends heavily on your implementation.

Another example (Mingw,gcc 3.2)

Code:

#include <fstream>

int main() {
	std::string str = "Hello World";
}

Compiles fine,but correct?