🚀 go-pugleaf

>From: schuenem@informatik.tu-muenchen.de (Ulf Schuenemann)
>Subject: Re: Proposal for a new access specifier
>Date: 10 Oct 1995 18:49:35 GMT

>Mike McCormick) writes:
>|> However, there is an alternative to changing the standard which I have
>|>not seen mentioned here yet.  That is, public const pointers:
>|> class Thing :
>|>      pReadOnly(&readOnly)
>        ^^^^^^^^^^^^^^^^^^^^ - you mixed class and ctor.
>|> [snip]

Oops!  The correct rendition would be:

class Thing:
{
private:
	int readOnly;
public:
	const int* const pReadOnly;
	Thing();
};

Thing::Thing() : pReadOnly(&readOnly) {};

>Unfortunately, now every instance gets an additional pointer.
>If one could declare, that every ctor of Thing initializes
>pReadOnly the same way so that for every instance pReadOnly
>points to the same attribute, then pReadOnly could be optimized
>away (like global const).

I probably misunderstand, but this sounds like an issue only if readOnly is 
static.  Since it is not, every Thing instance has its own readOnly, so every 
instance must have pReadOnly also.

>This is an example where it would be usefull to be able to initialize
>not only static but also nonstatic datamembers inside the class defn.

>  class Thing {
>  private:
>        int readOnly;
>  public:
>        const int* const pReadOnly =&readOnly; // ILLEGAL
>  };

Just supposing this *were* legal syntax, how is it an improvement over the 
constructor initializer syntax?



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 m.mccormick2@genie.geis.com
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