Error message in C++: increment of read-only member `c::x'

[Gerald Pfeifer]

On Thu, 17 Sep 1998, Gerald Pfeifer wrote:
> A colleague of mine got the error message 
> 
>   foo.cc: In method `void c::f() const':
>   foo.cc:5: increment of read-only member `c::x'
> 
> which is quite misleading, IMHO, for the following (destilled) snippet:
> 
>   class c {
>       int x,y,z;
>   public:
>       void f() const {
>           x++;
>           }
>       };

A current snapshot diagnoses 

  foo.cc: In method `void c::f() const':
  foo.cc:5: increment of member `c::x' in read-only structure

i.e., someone apparently has implemented my suggestion. Thanks!

> Wouldn't the first of these two messages in gcc/cp/typeck2.c be more
> intuitive? 
> 
>    96   if (TYPE_READONLY (TREE_TYPE (TREE_OPERAND (arg, 0))))
>    99     fmt = "%s of member `%D' in read-only structure";
>   100   else
>   101     fmt = "%s of read-only member `%D'";
>   102   (*fn) (fmt, string, TREE_OPERAND (arg, 1));

Gerald
-- 
Gerald Pfeifer (Jerry)      Vienna University of Technology
pfeifer@dbai.tuwien.ac.at   http://www.dbai.tuwien.ac.at/~pfeifer/