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DATE 2011-04-01

HANGOUT

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Key: Value:

Key: Value:

MESSAGE
DATE 2011-04-11
FROM Ruben Safir
SUBJECT Subject: [NYLXS - HANGOUT] C++ Workshop templated operator()<<]

as I understand things, the operator<<() needs to be external as to the
class and then declared as a friend of the class. I'm not sure if I
understand why that is the case.

I did this with a class called MESSAGE and had not trouble with the
general implementation. However, when I tried to do this with a
templated class that generally looks like, although this is not compiling

namespace stats{

template
class Distribution {
template friend std::ostream & operator<<(std::ostream &, const
Distribution&);
public:
/* ==================== LIFECYCLE ======================================= */
Distribution (T descr, int occurances = 0);
Distribution():freq(NULL),occurances(NULL){};
// Distribution ( const Distribution &other ); /* copy constructor */
// ~Distribution (); /* destructor */
/* ==================== ACCESSORS ======================================= */
T description(){ return freq;}
int population() { return occurances; }
/* ==================== MUTATORS ======================================= */
void increase_occ(){ ++occurances; std::cout << "description " << freq
<< " occurances " << occurances << std::endl; }
void descrease_occ(){ --occurances; }
/* ==================== OPERATORS ======================================= */
//Distribution& operator = ( const Distribution &other ); /* assignment
operator */
int operator()(){
return freq;
}
bool operator==(Distribution &tmp){
if(this->freq == tmp.freq)
return true;
return false;
}

bool operator<(Distribution &tmp){
if(freq < tmp.freq)
return true;
return false;
}



protected:
/* ==================== DATA MEMBERS
======================================= */
private:
/* ==================== DATA MEMBERS
======================================= */
T freq; //description of how many times found in a List
int occurances; //description of how many times a frequency was found in
a list
}; /* ----- end of class Distribution ----- */


template
std::ostream & operator << ( std::ostream & os, const Distribution &
obj )
{
T desc = obj.description();
int pop = obj.population();
os << "The Identification of " << desc << " was seens " << pop ;
return os;
} /* ----- end of function operator << ----- */


Not this is not compiling because:

test_del.cpp|90| error: passing ?const stats::Distribution? as
?this? argument of ?T stats::Distribution::description() [with T =
int]? discards qualifiers

which is on the call for the use of the << operator on the class. before
I templated
the operaotr<<(), I got a warning that I was using a non-templated
function. I've done some research and this
peoblem seems to have been common, but I don't know of any solutions,
and I don't understand what the implementation
issue is.



----- End forwarded message -----

  1. 2011-04-01 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop
  2. 2011-04-01 swd <sderrick-at-optonline.net> RE: [NYLXS - HANGOUT] C++ Workshop
  3. 2011-04-02 swd <sderrick-at-optonline.net> RE: [NYLXS - HANGOUT] Work
  4. 2011-04-05 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Work
  5. 2011-04-05 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop
  6. 2011-04-05 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Re: double deletes C++ Workshop
  7. 2011-04-06 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [pasa-at-lib.hu: Re: [accu-general] Who uses C?]
  8. 2011-04-06 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop Calendar
  9. 2011-04-06 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop, Linked List Workshop - usenet article.
  10. 2011-04-07 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Slackware news
  11. 2011-04-07 einker <eminker-at-gmail.com> Re: [NYLXS - HANGOUT] Slackware news
  12. 2011-04-07 einker <eminker-at-gmail.com> Re: [NYLXS - HANGOUT] Slackware news
  13. 2011-04-08 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [jan.vipin-at-gmail.com: Re: Query about C++ Workshop]
  14. 2011-04-10 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop Calendar
  15. 2011-04-10 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Hardware
  16. 2011-04-10 einker <eminker-at-gmail.com> Re: [NYLXS - HANGOUT] Hardware
  17. 2011-04-11 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop
  18. 2011-04-11 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop
  19. 2011-04-11 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop templated operator()<<]
  20. 2011-04-12 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] NYLUG Workshop / Hacking Society (Smalltalk, C++, Python) Tuesday April 12 6:00PM-8:00PM
  21. 2011-04-12 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [billy.donahue-at-gmail.com: Re: templated operator()<<]
  22. 2011-04-12 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop Template, claass and function specialization
  23. 2011-04-12 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop const
  24. 2011-04-15 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] Free Software Round Table TOMORROW, Saturday April 16 10-11 PM (streaming live)
  25. 2011-04-16 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] Free Software Round Table Canceled
  26. 2011-04-17 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop reminder
  27. 2011-04-18 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Happy Peasach
  28. 2011-04-19 Elfen Magix <elfen_magix-at-yahoo.com> Re: [NYLXS - HANGOUT] Happy Peasach
  29. 2011-04-19 Kevin Mark <kevin.mark-at-verizon.net> Re: [NYLXS - HANGOUT] Happy Peasach
  30. 2011-04-24 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [nbs-at-sonic.net: [vox] Fwd: Programmng the Kernel...]
  31. 2011-04-24 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] No Workshop tonight
  32. 2011-04-26 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] NYLUG Workshop / Hacking Society (Smalltalk, C++, Python) Tuesday April 26 6:00PM-8:00PM
  33. 2011-04-28 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] NYLUG Presents: 5/18 -at- 6:30PM Cameron L. Fadjo on Construct, Program, Design: Exploring Scratch From the Perspective of Computational Thinking and Cognition
  34. 2011-04-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLUG Presents: 5/18 -at- 6:30PM Cameron L. Fadjo
  35. 2011-04-28 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLUG Presents: 5/18 -at- 6:30PM Cameron L. Fadjo
  36. 2011-04-29 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] Free Software Round Table TOMORROW, Saturday April 30 10-11 PM (streaming live)
  37. 2011-04-29 Ron Guerin <ron-at-vnetworx.net> Re: [NYLXS - HANGOUT] NYLUG Presents: 5/18 -at- 6:30PM Cameron L. Fadjo
  38. 2011-04-29 einker <eminker-at-gmail.com> Subject: [NYLXS - HANGOUT] Bellingham's LinuxFest Northwest
  39. 2011-04-29 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Bellingham's LinuxFest Northwest
  40. 2011-04-29 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - New Webservices with OKWS - Sunday evening

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