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Subject: Re: [boost] suggestion on assertion macros
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2010-03-12 13:50:05

Roland Bock wrote:
> Steven Watanabe wrote:
> >
> > MSVC 9.0 /W4
> >
> > .\scratch.cpp(14) : warning C4800: 'int' : forcing value to bool 'true' or 'false' (performance warning)
> > .\scratch.cpp(14) : warning C4127: conditional expression is constant
> > .\scratch.cpp(7) : warning C4505: 'assert_helper' : unreferenced local function has been removed
> >
> OK, seems I need a sterner compiler.


C4800 seems ridiculous. Writing code using int as a Boolean is common to C code. Why would VC 9 inflict useless noise when compiling such code? Besides, if the variable is int, and it is needed in a Boolean context, what else would the developer do? I've seen use of the conditional operator to avoid that warning. I suspect that produces worse code than what is done when "forcing value to bool 'true' or 'false'."

C4505 seems useless. Why would one need to know that unused code isn't included in the object code? Either it is used and will cause a link error or it isn't and its absence isn't important. Did I miss a case?

Rob Stewart robert.stewart_at_[hidden]
Software Engineer, Core Software using std::disclaimer;
Susquehanna International Group, LLP

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