In article li6@f111.iassf.easams.com.au, rjl@f111.iassf.easams.com.au (Rohan LENARD) writes:
>
>Compare the initialisation of a struct within and out of a class -
>
>
>// Struct outside of class
>struct Thing {
>  double a;
>  int b;
>};
>
>Thing blob = { 10.0, -1 };

OK, because this is an "aggregate", (what we now call a PODS).

>// Struct inside of class ?
>class Foo {
>public:
>  Foo() : ClassBlob({10.0, -1}) {};
>  // or should it be
>  // Foo() : ClassBlob({double(10.0),int(-1)}) {};

Neither of these should be accepted. The mem-initializer requires an
epression inside the parens, and expressions do not contain braces.
The extra casts are irrelevent; 10.0 is already type double, and -1
is already type int.


>Is it possible to initialise ClassBlob like I have above, or not.
>
>The ARM seems to suggest that it is possible, but then both compilers I tried
>say it isn't.

I don't believe you can find a syntax production that allows this.

If you want to initialize the struct (as opposed to assigning to it)
give it a constructor:

struct Thing {
  double a;
  int b;
  Thing(double d, int i) : a(d), b(i) { }
};

Thing blob(10.0, -1); // instead of "= {10.0, -1};"

Foo::Foo() : ClassBlob(10.0, -1) { ... }

I think the result is easier to read and write, as well as allowing you
to initialize a Thing easily no matter where it occurs -- even anonymous
temps.

---
Steve Clamage, stephen.clamage@eng.sun.com