Passing a reference to TObjectDictionary <TKey, TValue> .TValueEnumerator

Question

I am trying to use a generic Delphi 2010 TObjectDictionary file.

I would like to pass the property enumerator of Valuesthis generic class, and the compiler doesn't seem to want me ... Example:

  TAttributeStates = class(TInterfacedObject, IAttributeStates)
  private
    FStates: TObjectDictionary<TPatchAttribute, TAttributeState>;

  public

    constructor Create;
    destructor Destroy; override;

    function GetEnumerator: TObjectDictionary<TPatchAttribute, TAttributeState>.TValueEnumerator;

  end;

  implementation

    function TAttributeStates.GetEnumerator: TObjectDictionary<TPatchAttribute, TAttributeState>.TValueEnumerator;
    begin
      result := FStates.Values.GetEnumerator;
    end;

This does not compile with an error:

[DCC Error] ChannelStates.pas(249): E2010 Incompatible types: 'TDictionary<Generics.Collections.TObjectDictionary<TKey,TValue>.TKey,Generics.Collections.TObjectDictionary<TKey,TValue>.TValue>.TValueEnumerator' and 'TDictionary<ChannelPatch.TPatchAttribute,ChannelStates.TAttributeState>.TValueEnumerator'

It seems that the compiler does not resolve the subtype correctly ...

Does anyone have any ideas?

N @

Answer 1

Found.

function GetEnumerator: TEnumerator<TAttributeState>;


function TAttributeStates.GetEnumerator: TEnumerator<TAttributeState>;
begin
  result := FStates.Values.GetEnumerator;
end;

It works great.