Delegate Literals + Immutability, pure and closures

[Jacob Carlborg]

On 2011-09-29 22:32, dsimcha wrote:
> Immutability and type propagation are two of D's greatest assets.  Below is an
> example of where they would be difficult to take advantage of:
>
> int foo;
> if( bar<  3) {
>      try {
>          foo = doStuff(someOtherStackVariables);
>      } catch(SomeException) {
>          foo = 666;
>      }
> } else {
>      foo = 4;
> }
>
> I've recently discovered this pattern to allow use of type propagation and
> immutability in these situations with no extra boilerplate:
>
> immutable foo = {
>      if( bar<  3) {
>          try {
>              return doStuff(someOtherStackVariables);
>          } catch(SomeException) {
>              return 666;
>          }
>      } else {
>          return 4;
>      }
> }();

First, that looks like JavaScript. Second, yet another reason to have a 
short lambda syntax with auto return.


-- 
/Jacob Carlborg