On Thu, 2004-01-29 at 14:36, Andrew P. Wilson wrote:
<snip/>
> However, I am finding that the indexer is not called at all and from
> disassembling the executable, the following instructions are occurring
> where I would have thought the indexer would have been called:
> IL_0099: callvirt instance object class
> [mscorlib]'System.Collections.ArrayList'::'get_Item'(int32)
> IL_009e: unbox [mscorlib]System.Int32
> Normally, this wouldnât be a problem for me. However, I cannot find
> this âget_Itemâ function anywhere in the mcs or mono source code.
> There is also a corresponding âset_Itemâ function that is called as
> well, but again, I cannot find it in the source code.
What you've stumbled across is C# "name mangling". In order to be
cross-language friendly (as not all languages support operator
overloading), all methods in IL are normal functions, but have a special
naming convention so that languages that support operator overloading
can view them.
For example, the addition operator:
public static Foo operator+ (Foo lhs, Foo rhs);
would become:
public static Foo op_Addition (Foo lhs, Foo rhs);
after it's generated.
The array index operator becomes get_Item for the getter, and set_Item
for the setter. The "Item" part of the names can be changed by using
the System.Runtime.CompilerServices.IndexerNameAttribute (which is how
System.String has a Chars indexer in VB.NET).
This is also true of properties:
public String MyProperty {
get {return "Foo";}
set {/* ignore */}
}
becomes:
public String get_MyProperty () {...}
public void set_MyProperty (String value) {...}
> Is there a situation where the ArrayList Indexer will be called? And
> do the get_Item and set_Item functions exist somewhere in the source
> code?
As seen above, the indexer is being called, you just need to know about
the name mangling.
- Jon
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