Re: [boost] #pragma warning (dsiable : 4996) ineffective?

From: John Maddock (john_at_[hidden])
Date: 2008-04-02 04:44:14

John Femiani wrote:
> Roland Schwartz wrote:
>>
>> I have seen some attempts from library authors,
>> e.g. boost/thread/win32/conditiona_variable.hpp
>> to get rid of the annoying MSVC warnings.
>>
>> However this seems not to work (at least on my machine).
>>
>
> How does the pragma work? Does it disable all warnings, or only
> warnings
> in subsequent declarations?  Does the warning state apply when a
> template class is declared or instantiated?

Only subsequent declarations: and by using #pragma warning(push/pop) you can 
scope the warning disabling to a specific section of code, while leaving the 
warning turned on for everyone else (if they want it).

> John Maddock wrote:
>> Anthony Williams wrote:
>>>> Couldn't this issue be handled by the boost config headers?
>>>
>>> That would seem better than handling it on a case-by-case basis, but
>>> it might change things for user code too (i.e. any code included
>>> *after* the boost headers).
>>
> In VC8, there is #pragma push_macro and pop_macro
>
>> It's also fragile: it only works if the Boost header is the first
> header
>> included, and if that header doesn't include any std lib headers
> before
>> boost/config.hpp :-(
>>
>
> But what if there is other truly deprecated code?  Isn't disabling the
> macro much more specific than disabling all warnings for all
> deprecated
> code?

No the macros are a global setting - the only reliable way to set these is 
globally on the command line, you can't turn them on and off for specific 
sections of code.

HTH, John.