Natools

Differences From Artifact [3bfa20ca4b]:

• File src/natools-references__protected.adb — part of check-in [66369eba6c] at 2014-07-17 19:37:28 on branch trunk — references__protected: task-safe portable variant of Natools.References, based on protected counters (user: nat, size: 4947) [annotate] [blame] [check-ins using]

To Artifact [440d417607]:

• File src/natools-references__protected.adb — part of check-in [610b834d9d] at 2014-08-24 20:31:35 on branch trunk — references: add Is_Last primitive

  It's almost a break in abstraction, and it's unsafe to use when the reference can be accessed concurrently. However it might have some use in some context, to free the last reference when checked in a protected or thread-local context, to build a crude garbage collection system. (user: nat, size: 5078) [annotate] [blame] [check-ins using]

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   function Is_Empty (Ref : Immutable_Reference) return Boolean is
   begin
      return Ref.Count = null;
   end Is_Empty;


   function Is_Last (Ref : Immutable_Reference) return Boolean is
   begin
      return Ref.Count.Get_Value = 1;
   end Is_Last;


   function "=" (Left, Right : Immutable_Reference) return Boolean is
   begin
      return Left.Data = Right.Data;
   end "=";