Disable specific warning?

This is a discussion on Disable specific warning? within the C++ Programming forums, part of the General Programming Boards category; I'm using Visual studio 2008 SP1 and I need to find a way to disable a specific warning while compiling ...

  1. #1
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    Disable specific warning?

    I'm using Visual studio 2008 SP1 and I need to find a way to disable a specific warning while compiling at a high warning level. Is there something I can use to disable a warning for the whole project?

    I know I can use this to disable/reenable it locally in the code:

    #pragma warning( disable : 4100)
    ...do stuff
    #pragma warning(default : 4100)

    ...but I would like something that is project wide.
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  2. #2
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    Nevermind, I found that I can add:

    /wd4100

    in the command line for C/C++ settings to disable warning C4100 as an example.
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  3. #3
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    ...but I have another question. When I'm doing the below to free the memory of a std::vector<int>:

    Code:
    theVector.clear();
    theVector.swap(std::vector<int>());
    ...I'm getting this warning at warning level 4:

    Code:
    warning C4239: nonstandard extension used : 'argument' : conversion from 'std::vector<_Ty>' to 'std::vector<_Ty> &'
    1>        with
    1>        [
    1>            _Ty=int
    1>        ]
    1>        A non-const reference may only be bound to an lvalue
    The code is working to free the vector but if possible I'd like to get rid of the warning. What to do?
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  4. #4
    Master Apprentice phantomotap's Avatar
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    You just need to reverse a bit...

    Soma

    Code:
    std::vector<int>().swap(theVector);

  5. #5
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    Quote Originally Posted by phantomotap View Post
    You just need to reverse a bit...

    Soma

    Code:
    std::vector<int>().swap(theVector);
    Ok that seems to do the trick, thanks!

    If I can get a second opinion that would be great though. I need to be sure this is a safe way to do it.
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  6. #6
    Master Apprentice phantomotap's Avatar
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    Safe?

    *shrug*

    "Safe" doesn't enter into it. It is legal to call a method of a temporary. (That's why the "std:fstream flush trick" works.) How you have been doing it is illegal.

    Soma

  7. #7
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    Quote Originally Posted by phantomotap View Post
    Safe?

    *shrug*

    "Safe" doesn't enter into it. It is legal to call a method of a temporary. (That's why the "std:fstream flush trick" works.) How you have been doing it is illegal.

    Soma
    Alright no offense, this will affect a lot of code if I do implement it so I just want to make sure it is a valid way and not just one persons leet haxx. Thanks for the extra info.

    Edit: I have read some other threads on the internet now and they point to the same thing as your example so it seems to be the way to go. Thanks.
    Last edited by DrSnuggles; 05-07-2009 at 09:29 PM.
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  8. #8
    Master Apprentice phantomotap's Avatar
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    O_o

    I wasn't offended. I was only offering context by which to interpret the statements.

    This is basically the same as "(some_std__string + "some c string").c_str()" which you'll find everywhere.

    Soma

  9. #9
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    Ok, I thought you might have been offended because I wanted a second opinion and didn't trust your coding skills. Luckily it was not so. Thanks again.
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