[Issue 4561] New: D2 Language Docs: http://www.digitalmars.com/d/2.0/function.html

August 01, 2010
Posted by Andrej Mitrovic
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Andrej Mitrovic
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http://d.puremagic.com/issues/show_bug.cgi?id=4561

           Summary: D2 Language Docs:
                    http://www.digitalmars.com/d/2.0/function.html
           Product: D
           Version: D2
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: www.digitalmars.com
        AssignedTo: nobody@puremagic.com
        ReportedBy: andrej.mitrovich@gmail.com


--- Comment #0 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2010-08-01 14:48:02 PDT ---
"Function Inheritance and Overriding"

The 4th example is trying to import std.hiddenfunc. The compiler can't find that file (I'm guessing this was moved someplace else). This will need updating.



"Overload Sets"

There are three code example modules here:

module A;
void foo() { }
void foo(long i) { }

module B;
class C { }
void foo(C) { }
void foo(int i) { }

import A;
import B;

void bar(C c)
{
    foo();    // calls A.foo()
    foo(1L);  // calls A.foo(long)
    foo(c);   // calls B.foo(C)
    foo(1,2); // error, does not match any foo
    foo(1);   // error, matches A.foo(long) and B.foo(int)
    A.foo(1); // calls A.foo(long)
}


I am getting an additional error on line:
foo(1L);

error:
new.d(7): Error: B.foo at B.d(4) conflicts with A.foo at A.d(3)

a.foo(long) and b.foo(int) conflict when passing long as an argument. But seeing as calling them with an int will conflict as well, I expect this to be the normal behavior. If that is so, change that line to:

foo(1L);  // error, matches A.foo(long) and B.foo(int)



Title: "Typesafe variadic functions"

In the third example, change these lines:

Foo g = new Foo(3, "abc");
test(1, 4, "def");

to:

Foo g = new Foo(3, "abc".dup);
test(1, 4, "def".dup);

for the example to compile.



"Local Variables"

"It is an error to use a local variable without first assigning it a value."

This sounds like C semantics to me. But D has all of its local variables initialized to their default values, so I'm not sure what this statement means.

"It is an error to declare a local variable that
is never referred to."

I've never had such an error and neither a warning. Can someone elaborate?

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