Seemingly inappropriate compilation warning with C

问题:

I'm playing with a C++/CLI application that talks to my Isis2 (C# .NET) library. In the code below I get the error "Warning 3 C4538: 'cli::array ^' : const/volatile qualifiers on this type are not supported". I highlighted the line that throws this. I'm baffled: this doesn't have an array, nor does it use const or volatile! Any suggestions?

// CPlusPlus.cpp : main project file.

#include "stdafx.h"
#using <IsisLib.dll>
using namespace Isis;
using namespace System;

void GotNewView(View^ v)
{
   Console::WriteLine("Got a new view: " + v->ToString());
}

public delegate void GotAnInt_T (int i);
void GotAnInt(int i)
{
   Console::WriteLine("Got an int: {0}", i);
}

public delegate void GotTwo_T (String ^s, double d);
void GotTwo(String^ s, double d)
{
   Console::WriteLine("Got a string: <{0}> and a double: {1}", s, d);
}

public delegate void SendsReply_T(int i);
void SendsReply(int i)
{
   thisGroup()->Reply(-i);
}

int main(array<System::String ^> ^args)
{ 
   IsisSystem::Start();
   Group ^g = gcnew Group("test");       <============= THIS LINE
   g->RegisterViewHandler(gcnew ViewHandler(GotNewView));
   g->Handlers[0] += gcnew GotAnInt_T(GotAnInt);
   g->Handlers[0] += gcnew GotTwo_T(GotTwo);
   g->Handlers[1] += gcnew SendsReply_T(SendsReply);
   g->Join();
   g->Send((int^)0, 12345);
   g->Send((int^)0, "Aardvarks are animals", 78.91);
   Console::WriteLine("After Send, testing Query");
   Collections::Generic::List<int>^ results = gcnew Collections::Generic::List<int>();
   int nr = g->Query(Group::ALL, 1, 6543, gcnew EOLMarker(), results);
   IsisSystem::WaitForever();
   return 0;
}

回答1:

This is a known compiler bug: it is warning about a volatile array member of Group. It shouldn't do that.

The recommended workaround is to disable the warning:

#pragma warning (disable: 4538)

It may be possible to disable the warning only for the problematic lines of code, though I am not 100% sure, since there's nothing in the C++/CLI code that causes this problem. You can try:

#pragma warning (push)
#pragma warning (disable: 4538)
Group^ g = gcnew Group("test");
#pragma warning (pop)