Manifest constants - why not 'alias' ?

[Walter Bright]

Robert Fraser wrote:
> Walter Bright wrote:
>> Bill Baxter wrote:
>>> Enum is short for 'unumeration'.  But manifest constants aren't 
>>> enumerating anything.  It makes no sense.
>>
>> Because we already use enums to declare constant values.
>>
>> enum { x = 3 }
> 
> Will enum be able to work as a modifier as in:
> 
> enum
> {
>     int x = 3;
>     auto y = "hello";
> }
> 
> ...?

I seriously doubt it <g>.


> Also, unrelated, will there be a way to declare a class variable that is 
> constant after construction (it is assigned once in the constructor, 
> then doesn't change)?

Yes, just don't supply an initializer for it:

class C
{
	const int x;
	this()
	{
		x = 3; // ok
	}
	void foo()
	{
		x = 3; // error, x is const
	}
}