weired behaviour of std::vector at() function

Quote:

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Originally posted by PaulWendt
Boy ... consider yourself lucky. At least you didn't get told you'd
be a failure at any job interview; that's another of his favorites :)

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Well...what do you expect from a guy who puts the following in his resume...

"I am well known due to my fantastic problem solving, bug-tracking and code optimization skills, and my expertise in digital audio signal processing and Windows multimedia programming. My colleagues call me “Master of Debugging”, “Master of Code Performance”."

Sorry but I could not resist... :D

Quote:

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I confirmed it. I have installed 3.1.1 on our AIX box, but I left the
old headers for 2.95.2 there for weird occasions like this. I did
the following:

code:--------------------------------------------------------------------------------
>grep "at(" *

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That's hardly a search. What if there is a space character between "at" and the "(", like "at ("?

I used GCC 2.95. There is nothing missing in the vector header file. If the problem is the const version of at is missing, the compiler should complain about a different error. It should match the existing "at" with how you code calls it, and realize that you need a none const reference to the vector class that calls the none-const at, and it will then complain it can't convert a const vector pointer (which is actually a reference) to a none-const vector pointer.

Here is an example:

Code:

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void DoSomething(const intvec& myVector)
{
        int        j = 0;

        myVector.at(j).fld1 = "Hello";
}

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And the error while compiling:

Code:

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Compiling...
test.cpp
c:\test\test\test.cpp(129) : error C2662: 'at' : cannot convert 'this' pointer from 'const class std::vector<class SomeClass,class std::allocator<class SomeClass> >' to 'class std::vector<class SomeClass,class std::allocator<class SomeClass> > &'
        Conversion loses qualifiers
c:\test\test\test.cpp(129) : error C2228: left of '.fld1' must have class/struct/union type
Error executing cl.exe.

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Quote:

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Originally posted by AnthonyMai


That's hardly a search. What if there is a space character between "at" and the "(", like "at ("?

I used GCC 2.95. There is nothing missing in the vector header file.

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Then post the line in the header that declares the at() function. Do you think we're going to take your word for it? The at() function is missing from the SGI STL documentation and most likely, their implementation. I wouldn't be surprised if gcc doesn't have it either.

Quote:

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Code:

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Compiling...
test.cpp
c:\test\test\test.cpp(129) : error C2662: 'at' : cannot convert 'this' pointer from 'const class std::vector<class SomeClass,class std::allocator<class SomeClass> >' to 'class std::vector<class SomeClass,class std::allocator<class SomeClass> > &'
        Conversion loses qualifiers
c:\test\test\test.cpp(129) : error C2228: left of '.fld1' must have class/struct/union type
Error executing cl.exe.

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Using VC++ to confirm something that gcc reports to be an error?

Regards,

Paul McKenzie

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Well...what do you expect from a guy who puts the following in his resume...

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The above post pertains nothing to the topic of programming
and seriously violated my privacy, and as well as violated my copyright, by posting my resume, without my written consensus. Hence it breaks the rule of this board.

This behavior is totally unacceptable. If the moderator continue
to allow people to reveal other user's privacies on this board unchecked, not only this board can not survive for long, it could also break the US laws.

I am hereby requesting that the moderator of this board ban
Andreas Masur from accessing this board. I also reserve the right to pursue this issue through the legal channel should Mr. Andreas Masur's violation of my privacy continues.

Finally, Mr. Andreas Masur should be able to contact my former employer and find out that I am indeed adequately describing myself in my resume. BTW, both me and boss are pretty happy with what I am doing on my current job and probably won't need to write another resume for a while.

Quote:

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AnthonyMai said:
That's hardly a search. What if there is a space character between "at" and the "(", like "at ("?

I used GCC 2.95. There is nothing missing in the vector header file....

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You make a valid point in that I maybe used an inadequate
search, but GNU uses a bunch of formatting conventions. That's
not to say that conventions haven't been broken before, but
it's their style to put an opening parenthesis right after the
function name.

As far as saying "there is nothing missing in the vector header",
that's just not correct for MY installation of gcc. I had version
2.95.2; I don't know what they put into 2.95.3 and I don't know
what they put into 2.96. You could use vector<>::at with all the
const, non-const, int, unsigned int etc. overloads until you were
blue in the face, the vector<>::at simply didn't exist with 2.95.2
on any of our unix systems.

No, it's not just me, either. I did a search on google and other
people were complaining about vector not having at with gnu
2.95 [not sure about the smaller version number]. string didn't
have at, either. gcc-3.0 was eagerly anticipated by a lot of the
open source development community because of its closer
adherence to the recently approved ISO standard for C++. It's
because of vector<>::at and the i/ostringstream stuff I mentioned
earlier.

--Paul