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Groups > comp.lang.c++ > #10232

Re: index operator overload

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On Sat, 17 Sep 2011 17:23:25 +0200, Philipp Kraus wrote:

> I would like to overload in my class the [] or () operator. Many tutorials
> create the call like
> myvaluetype& operator[] (const int&)
> or
> myvaluetype operator[] (const int&)
> 
> but is this correct? An index is in my opinion >= 0, so I should use a
> uint like std::size_t .

The STL containers which provide operator[] use an unsigned type.

> The call can be also const, because it returns a value with no modify of
> object data.

The first one above returns a non-const reference, so it can't be const.

> Is there a coding style guide or anything else for a correct call? I would
> like to create
> my overloading call to:
> myvaluetype operator[] (const std::size_t&) const;

If the objects actually exist within the container (rather than being
generated on the fly), you should normally return a reference rather than
a copy.

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index operator overload Philipp Kraus <philipp.kraus@flashpixx.de> - 2011-09-17 17:23 +0200
  Re: index operator overload Marc <marc.glisse@gmail.com> - 2011-09-17 16:18 +0000
    Re: index operator overload Noah Roberts <roberts.noah@gmail.com> - 2011-09-17 09:53 -0700
      Re: index operator overload Marc <marc.glisse@gmail.com> - 2011-09-17 18:22 +0000
  Re: index operator overload Nobody <nobody@nowhere.com> - 2011-09-17 19:32 +0100
  Re: index operator overload James Kanze <james.kanze@gmail.com> - 2011-09-19 15:31 -0700
    Re: index operator overload Leigh Johnston <leigh@i42.co.uk> - 2011-09-19 23:41 +0100
  Re: index operator overload Philipp Kraus <philipp.kraus@flashpixx.de> - 2011-09-20 21:50 +0200

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