Re: Clarified references, shortcut notation

edA-qa wrote:
> C++ is confused when it comes to default construction and 
> initialization.  I have the opinion that unless stated otherwise, all 
> objects should be default initialized and all references should be null 
> initialized.

I agree.

> Even with performance in mind it is rare that one would specifically 
> want to leave a value unitialized (an optimizer will remove the 
> redundant initialization should it not be needed).

Arrays are an exception and their initialization should be optional. 
Containers, such as Vector, will be implemented using a combination of 
uninitialized arrays and a placement new. Below is the proposed syntax 
for array initialization per Declarators document:

[]<int> a1[10](-1); // array of 10 integers initialized with -1

[]<int> a2[10];     // array of 10 uninitialized integers;
                     //   memory is aligned for constructing objects
                     //   of type int

[]<int> a3[10]();   // array of 10 zero-initialized integers

struct A {
   A();
   A(int);
};

[]<A> b1[10](12);  // array of 10 instances of `A' constructed
                    //    using A(int)

[]<A> b2[10];      // array of 10 uninitialized entities of A;
                    //   memory is aligned for constructing objects
                    //   of type `A'

new (@b3[0])(12);  // constructs an `A' object at location 0 using
                    //    A(int)

new (@b3[1])();    // constructs an `A' object at location 1 using
                    //    A()

[]<A> b4[10]();    // array of 10 instances of `A' constructed
                    //    using A()

--

-- 
Slawomir Lisznianski
C2 Language Group Principal (http://c2-lang.org)

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