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Old 03-28-2011, 08:42 PM   #1
Registered: May 2009
Distribution: Debian wheezy
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How to write a stream inserter for a template class

I had some trouble doing this but finally figured it out. Here is a general solution:
#include <iostream>
using namespace std;

// Pre-declare class template...
template <class T> class MyTemplate;

// So we can pre-declare inserter...
template <class T> ostream &operator<<(ostream &stream, const MyTemplate<T> &t);

// So when we define the class template...
template <class T> class MyTemplate {
    // We can declare inserter a friend.
    friend ostream &operator<< <T> (ostream &stream, const MyTemplate<T> &t);

// Now inserter can access MyTemplate's private members
template <class T> ostream &operator<<(ostream &stream, const MyTemplate<T> &t) {
Hope this helps someone.
Old 03-31-2011, 02:56 AM   #2
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Thanks for sharing your solution. Off the Zero Reply List.

Kind regards,



c++, ostream, template

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