Re: [ANN] Lua 5.2.0 (rc5) now available

[David Given <dg@...>]

On 06/12/11 19:24, Wim Couwenberg wrote:
[...]
> In c++ "const T obj;" is a definition (with internal linkage) while in
> c it is only a tentative definition (with external linkage).
> Moreover, in c++ const data *must* be initialized, either by an
> explicitly declared constructor or an initializer.  So in c++ "const
> TValue obj;" is indeed an error since TValue declares no constructor
> (obviously) and the definition of obj does not specify an initializer,
> such as ={}.

I have, in fact, just been looking into this...

The C++ idiomatic alternative to tentative definitions is to use unnamed
namespaces. So:

  static int i;
  ...
  static int i = 4;

...becomes:

  namespace
  {
    extern int i;
    ...
    int i = 4;
  }

Due to magic, i is visible throughout the rest of the file but nowhere else.

Unfortunately, I don't think this is possible:

  namespace
  {
    extern int i;
  }
  ...
  namespace
  {
    int i = 4;
  }

Backwards compatibility? They've heard of it.

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