• Markus Dangl <danglm in.tum.de> May 21 2006
• Tom S <h3r3tic remove.mat.uni.torun.pl> May 21 2006

Markus Dangl <danglm in.tum.de> writes:

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I expected the following code to print "Hello", but it doesn't. Since a 
nested class has access to its enclosing classes' members, i assumed it 
could also return delegates to its methods. Where am i wrong - or is it 
a bug?

# module nestedclass;
#
# private import std.stdio;
#
# class Foo
# {
#     class Bar
#     {
#         void delegate() getDelegate()
#         {
#             return &sayHello;
#         }
#     }
#     Bar bar;
#
#     void sayHello()
#     {
#         writefln("Hello");
#     }
#
#     this()
#     {
#         bar = new Bar();
#     }
# }
#
# int main(char[][] argv)
# {
#     Foo foo = new Foo();
#     void delegate() sayHello = foo.bar.getDelegate();
#     sayHello();
#
#     return 0;
# }

Tom S <h3r3tic remove.mat.uni.torun.pl> writes:

Markus Dangl wrote:
 I expected the following code to print "Hello", but it doesn't. Since a 
 nested class has access to its enclosing classes' members, i assumed it 
 could also return delegates to its methods. Where am i wrong - or is it 
 a bug?


Looks like a bug to me... you could try the following workaround:

class Foo
{
	Foo outer() { return this; }
	
	...

	class Bar {
		void delegate() getDelegate()
		{
			return &outer.sayHello;
		}
	}
	
	...
}


-- 
-----BEGIN GEEK CODE BLOCK-----
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Tomasz Stachowiak  /+ a.k.a. h3r3tic +/