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DATE 2011-05-01

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MESSAGE
DATE 2011-05-24
FROM Ruben Safir
SUBJECT Subject: [NYLXS - HANGOUT] template implicit converstion
From owner-hangout-outgoing-at-mrbrklyn.com Tue May 24 13:56:17 2011
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From: Ruben Safir
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Subject: [NYLXS - HANGOUT] template implicit converstion
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Xref: panix comp.lang.c++:1085272

> I'm having trouble understanding why my program is making a change in the
> argument type of my template class function

A short answer is that what you are seeing is due to an implicit
conversion that is part of the C++ programming language. If you do
not want this implicit conversion done, declare the constructor
being used by the implicit conversion as explcit, as it

class Distribution {
public:
explicit Distribution(int i) {
// whatever the constructor does
}
}

What follows are details, with most of the source you gave snipped
down to essentials.

> template < class T >
> void List::find_value(T val)
> {
[snip]
> }

[snip]

> tallies = new chainlist::List< chainlist::List< stats::Distribution > *>;
>
> std::cout << "The standard mean for picking 7 is ==> " << stats::mean_list(tallies, 7 ) << std::endl;;
>
> template
> float mean_list(chainlist::List< chainlist::List >* > * tallies, T search_val){
[snip]
> chainlist::List > * dump;

> dump->find_value(search_val);
[snip]
> }

[snip]

The expression

stats::mean_list(tallies, 7 )

implicitly instantiates the mean_list function template. Due to the
argument types, the instantiated function includes the declaration

chainlist::List > * dump;

The expression

dump->find_value(search_val)

implicitly instantiates the find_value member function template.
Due to the type of the object for which the member function is
called, the instantiated member function is

void List >::find_value(
stats::Distribution val)

In the call to that function by dump->find_value(search_val), an
implicit conversion by constructor is done to convert the search_val
argument (of type int) to a stats::Distribution (the type of
the parameter).

  1. 2011-05-02 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - New Webservices with OKWS -
  2. 2011-05-06 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] NYLXS Business
  3. 2011-05-06 Ron Guerin <ron-at-vnetworx.net> Re: [NYLXS - HANGOUT] NYLXS Business
  4. 2011-05-06 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] NYLXS Business
  5. 2011-05-09 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] UPDATED! NYLUG Presents: 5/18 -at- 6:30PM Cameron L. Fadjo on Construct, Program, Design: An Introduction to Scratch From the Perspective of Computing and Cognition
  6. 2011-05-09 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - Notes
  7. 2011-05-10 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] NYLUG Workshop / Hacking Society (Smalltalk, C++, Python) Tuesday May 10 6:00PM-8:00PM
  8. 2011-05-15 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - Notes
  9. 2011-05-16 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - Notes
  10. 2011-05-16 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: [New-York-C-Developers-Group] MongoNYC - MongoDB Conference
  11. 2011-05-16 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - New Webservices with OKWS -
  12. 2011-05-18 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [rick-at-linuxmafia.com: [conspire] YouTube downloading software
  13. 2011-05-19 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - creating a distribution list
  14. 2011-05-19 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - creating a distribution list
  15. 2011-05-20 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - New Webservices with OKWS -
  16. 2011-05-22 Ron Guerin <ron-at-vnetworx.net> Re: [NYLXS - HANGOUT] C++ Workshop - New Webservices with OKWS -
  17. 2011-05-22 Ron Guerin <ron-at-vnetworx.net> Re: [NYLXS - HANGOUT] C++ Workshop - New Webservices with OKWS -
  18. 2011-05-23 swd <sderrick-at-optonline.net> Subject: [NYLXS - HANGOUT] Membership Dues Address?
  19. 2011-05-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Membership Dues Address?
  20. 2011-05-23 swd <sderrick-at-optonline.net> RE: [NYLXS - HANGOUT] Membership Dues Address?
  21. 2011-05-23 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Template Argument type deterination
  22. 2011-05-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Membership Dues Address?
  23. 2011-05-23 swd <sderrick-at-optonline.net> RE: [NYLXS - HANGOUT] Membership Dues Address?
  24. 2011-05-23 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Membership Dues Address?
  25. 2011-05-24 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [ian.bruntlett-at-gmail.com: [accu-general] Free e-book:- The
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  27. 2011-05-24 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [billy.donahue-at-gmail.com: Re: [mrbrklyn-at-panix.com: Template
  28. 2011-05-24 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [ruben-at-mrbrklyn.com: Re: [mrbrklyn-at-panix.com: Template Argument
  29. 2011-05-24 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [ruben-at-mrbrklyn.com: Re: [mrbrklyn-at-panix.com: Template Argument
  30. 2011-05-24 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] [ruben-at-mrbrklyn.com: Re:
  31. 2011-05-24 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] [ruben-at-mrbrklyn.com: Re:
  32. 2011-05-24 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] [ruben-at-mrbrklyn.com: Re:
  33. 2011-05-24 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] template implicit converstion
  34. 2011-05-24 Ron Guerin <ron-at-vnetworx.net> Subject: [NYLXS - HANGOUT] NYLUG Workshop / Hacking Society (Smalltalk, C++, Python) Tuesday May 24 6:00PM-8:00PM
  35. 2011-05-24 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] [mrbrklyn-at-panix.com: (fwd) Template argument determination]
  36. 2011-05-25 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - New Webservices with OKWS -
  37. 2011-05-25 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] C++ Workshop - New Webservices with OKWS -
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  43. 2011-05-26 Ruben Safir <mrbrklyn-at-panix.com> Re: [NYLXS - HANGOUT] Perl Class
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  46. 2011-05-27 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] C++ Workshop - next phase
  47. 2011-05-27 Ruben Safir <mrbrklyn-at-panix.com> Subject: [NYLXS - HANGOUT] Fwd: Consensus from last night's meeting
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