CppStreamOutOperator

(C++) Stream out operator <<

This operator is used most comming using the std::cout stream:

  1. include <iostream>

    2. 


int main()
{
  std::cout << "Hello world" << std::endl;
  return 0;
}


Compile error 'operator<<' not implemented in type 'ostream' for arguments of type 'std::string'

Caused by the following simple code:

  1. include <iostream>

    2. 

  2. include <vector>

    3. 


int main()
{
  std::string s = "Hello";
  std::cout << s;
}


The answer is to #include <string>, which contains the definition of the function lacking.

  1. include <iostream>

    2. 

  2. include <vector>

    3. 

#include <string>
int main()
{
  std::string s = "Hello";
  std::cout << s;
}


Questions


last edited (December 24, 2006) by bilderbikkel

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