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Leif Uneus

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  1. Is it not enough to declare DefaultCW8087 et al. as threadvar?
  2. Leif Uneus

    RTTI in dpr / console app dpr

    Like using the $STRONGLINKTYPES directive? http://docwiki.embarcadero.com/RADStudio/en/Strong_link_types_(Delphi)
  3. Leif Uneus

    RTTI in dpr / console app dpr

    If a class is not used, RTTI information is stripped off by the compiler, See https://stackoverflow.com/q/10613094/576719
  4. Leif Uneus

    Typed constants in Delphi.

    Whether a typed constant is immutable or not is controlled by a compiler switch. See http://docwiki.embarcadero.com/RADStudio/en/Writeable_typed_constants_(Delphi)
  5. Leif Uneus

    Strange behavior for literals

    The type is still extended, but the value will be as a single(0.1) program Project169; {$APPTYPE CONSOLE} uses System.SysUtils, System.TypInfo; type TTypeInfo = class class function ShowTypeInfo<T>(const X: T) : String; end; class function TTypeInfo.ShowTypeInfo<T>(const X: T) : String; var LTypeInfo: PTypeInfo; begin LTypeInfo := TypeInfo(T); Result := LTypeInfo.Name; end; const F1 : Single = 0.1; F2 = Single(0.1); // <- Extended type, with the value of a single 0.1 F3 = Extended(0.1); begin WriteLn(TTypeInfo.ShowTypeInfo(F1):10,':',F1); WriteLn(TTypeInfo.ShowTypeInfo(F2):10,':',F2); WriteLn(TTypeInfo.ShowTypeInfo(F3):10,':',F3); ReadLn; end. Outputs: Single: 1.00000001490116E-0001 Extended: 1.00000001490116E-0001 Extended: 1.00000000000000E-0001
  6. Leif Uneus

    Strange behavior for literals

    @Vandrovnik, Still both F1 and F2 are of type extended.
  7. Leif Uneus

    TStopwatch.Elapsed

    Use StopWatch := TStopWatch.Create to initialize a new TStopWatch value in a stopped condition or StopWatch := TStopWatch.StartNew to return a started stopwatch. See http://docwiki.embarcadero.com/Libraries/Rio/en/System.Diagnostics.TStopwatch.Create
  8. You might be better off with this link to QP: https://quality.embarcadero.com
  9. Leif Uneus

    Revisiting TThreadedQueue and TMonitor

    Sorry @DavidHeffernan, but in the file posted by @pyscript his proposed function InterlockedCompareExchange128 returns a boolean.
  10. Leif Uneus

    Revisiting TThreadedQueue and TMonitor

    @pyscripter Note that in InterlockedCompareExchange128, the last line (MOVZX EAX,AL) is redundant. The function returns a boolean, one byte in size. And, in InterlockedCompareExchange, should it not be following code for the 32 bit ? Result := InterlockedCompareExchange64(Int64(Dest), Int64(NewValue), Int64(CurrentValue)) = Int64(CurrentValue);
  11. Leif Uneus

    Revisiting TThreadedQueue and TMonitor

    Maybe someone can understand this Q&A at SO: CMPXCHG16B correct? https://stackoverflow.com/q/4825400/576719 Or ask a new question at SO.
  12. Leif Uneus

    Revisiting TThreadedQueue and TMonitor

    It is linked by @pyscripter a few replies above.
  13. Leif Uneus

    Revisiting TThreadedQueue and TMonitor

    A little reference article to the CAS and ABA problem. http://ithare.com/cas-reactor-for-non-blocking-multithreaded-primitives/
  14. Leif Uneus

    language updates in 10.4?

    The greatest problem with inline variable declarations, are backward compatibility. I don't see any benefit, except for some logical clarifications.
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