Re: [boost] Re: [ANN] Spirit C++ parser framework.

From: Greg Colvin (gcolvin_at_[hidden])
Date: 2001-05-25 18:08:06

From: joel de guzman <joel_at_[hidden]>
> From: "Douglas Gregor" :
> 
> > The bracket notation unfortunately can't be used for everything, because
> > digit[0, 2] == digit[2]
> 
> Please elaborate...

With this file:

1   struct X {
2      X& operator[](int,int) { return *this; }
3      X& operator[](int) { return *this; }
4   }; 
5
6   int main() {
7      X x;
8      X y = x[0,1];
9       return 0;
10  }

EDG gives these warnings:

    "temp.cpp", line 2: error: too many parameters for this operator function
       X& operator[](int,int) { return *this; }
        ^

    "temp.cpp", line 8: warning: expression has no effect
       X y = x[0,1];

So it goes.