array als var-Parameter

[Sir Rufo]

Dann bau dir halt einen Wrapper

Delphi-Quellcode:

type
  TPIntArray = array of PInteger;

  TIntValueSetter = record
  private
    FValues: TPIntArray;
  public
    function AddVar( var Value: Integer ): TIntValueSetter;
    procedure SetValue( Value: Integer );
  end;

  TValueSetter = record
    class function Int: TIntValueSetter; static;
  end;

  { TValueSetter }

class function TValueSetter.Int: TIntValueSetter;
begin
  SetLength( Result.FValues, 0 );
end;

{ TIntValueSetter }

function TIntValueSetter.AddVar( var Value: Integer ): TIntValueSetter;
var
  LValues: TPIntArray;
  LIdx: Integer;
begin
  SetLength( LValues, Length( FValues ) + 1 );
  for LIdx := low( FValues ) to high( FValues ) do
    LValues[ LIdx ] := FValues[ LIdx ];
  LValues[ high( LValues ) ] := @Value;
  Result.FValues := LValues;
end;

procedure TIntValueSetter.SetValue( Value: Integer );
var
  LIdx: Integer;
begin
  for LIdx := low( FValues ) to high( FValues ) do
    FValues[ LIdx ]^ := Value;
end;

procedure SetValue( Values: array of Integer; Value: Integer = 0 );
var
  LIdx: Integer;
begin
  for LIdx := low( Values ) to high( Values ) do
    Values[ LIdx ] := Value;
end;

procedure Test;
var
  Val1, Val2, Val3: Integer;
  TargetValue: Integer;

  Set1, Set2, Set3: TIntValueSetter;
begin
  Val1 := 42;
  Val2 := 84;
  Val3 := 34;
  TargetValue := 0;

  TValueSetter.Int.AddVar( Val1 ).AddVar( Val2 ).AddVar( Val3 ).SetValue( TargetValue );

  Assert( ( Val1 = TargetValue ) and ( Val2 = TargetValue ), 'Mist, hat nicht funktioniert' );

  Set1 := TValueSetter.Int.AddVar( Val1 ).AddVar( Val2 );
  Set2 := TValueSetter.Int.AddVar( Val2 ).AddVar( Val3 );
  Set3 := TValueSetter.Int.AddVar( Val1 ).AddVar( Val2 ).AddVar( Val3 );

  WriteLn( 'Set1.SetValue( 1 )' );
  Set1.SetValue( 1 );
  WriteLn( 'Val1: ', Val1, ' Val2: ', Val2, ' Val3: ', Val3 );
  WriteLn;
  WriteLn( 'Set2.SetValue( 2 )' );
  Set2.SetValue( 2 );
  WriteLn( 'Val1: ', Val1, ' Val2: ', Val2, ' Val3: ', Val3 );
  WriteLn;
  WriteLn( 'Set3.SetValue( 3 )' );
  Set3.SetValue( 3 );
  WriteLn( 'Val1: ', Val1, ' Val2: ', Val2, ' Val3: ', Val3 );
end;