[Lazarus] AutoCommit

Ondrej Pokorny lazarus at kluug.net
Sun Nov 15 06:38:04 CET 2020

On 14.11.2020 18:02, Michael Van Canneyt via lazarus wrote:
> On Sat, 14 Nov 2020, Sven Barth via lazarus wrote:
>> No, cause their intended default value could be True. Thus no special
>> handling for them.
> You can of course say the same for all other types for which an 
> implicit 'default'
> is implemented. The more so because a class is initialized with 0 in 
> which
> case every enumerated and boolean will be ord(0) unless otherwise
> initialized in the constructor.
> So I don't see why this rule is not applied to all properties, I don't 
> think
> it is logical.

I agree. One would not expect the implicit default values for 
string/real/pointer properties.

And then people wonder why their empty string properties are not streamed:

TMyClass = class
   property MyString: string read FString write FString stored 

constructor TMyClass.Create;
   FMyString := 'abc';

function TMyClass.IsMyStringStored: Boolean;
   Result := FMyString<>'abc';

What's wrong?
-> The nodefault is missing in order the empty string be streamed:
   property MyString: string read FString write FString stored 
IsMyStringStored nodefault;

Not logical, not intuitive, but that is how it works and is documented :/


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