VS 2010 C++ IntelliSense “a storage class may not be specified here” even though it can?

问题

This is a fairly minor question, but it's annoying me: IntelliSense seems to be convinced that declaring static variables ~~at the function-scope~~ in an if condition is an error, and complains about it. Only it builds just fine, and even the MSDN docs mention it as a legitimate usage. I'd really like to get rid of the wavy red line, because it comes up fairly often (it's used in a macro I use regularly).

Here's the code, as an example, though it's not the only example in my program:

MyForm::MyForm()
{
    _VMESSAGE("Constructing '%s'/%p:%p @ <%p>",GetEditorID(),GetFormType(),formID,this);
    if (static bool runonce = true)
    {
        // patch up vtbl    
        memaddr thisvtbl = (UInt32)memaddr::GetObjectVtbl(this);
        _MESSAGE("Patching MyForm Form vtbl @ <%p>",thisvtbl);
        gLog.Indent();
        for (int i = 0; i < sizeof(Form_NoUseMethods)*0x8; i++)
        {
            if ((Form_NoUseMethods[i/0x20] >> (i%0x20)) & 1)
            {
                thisvtbl.SetVtblEntry(i*4,TESForm_vtbl.GetVtblEntry(i*4));
                _VMESSAGE("Patched Offset 0x%04X",i*4);
            }
        }
        gLog.Outdent();

        runonce  =  false;
    }
}

Both the static in the if ( static bool runonce = true ) line and every usage of _MESSAGE or _VMESSAGE (which uses a similar construct) is underlined by IntelliSense, and hovering over any reads "Error: a storage class may not be specified here." Building the project produces no errors relating to these lines.

回答1:

The VC++ compiler allows this as a silent extension (it is not legal C++), but the VC++ IntelliSense engine is based on the EDG compiler frontend, not the VC++ compiler (go figure). So, the IntelliSense error is correct if you're concerned about writing portable code.

回答2:

Hold on -- are you saying that the following code compiles and runs in MSVC?

int main() {
  if (static bool runonce = true) return 0 ;
}

That's a new one on me. g++ certainly doesn't accept it.

BTW, in your question, you mention "declaring static variables at the function-scope", which is not a problem:

int main() {
  static bool runonce = true ;
  if (runonce) return 0 ;
}

来源：https://stackoverflow.com/questions/6193506/vs-2010-c-intellisense-a-storage-class-may-not-be-specified-here-even-though

标签

c++

visual-studio-2010

static

intellisense