Due to the "Multiple variable initialization" thread I took a look into
FPC documentation: https://www.freepascal.org/docs-html/ref/refse24.html
There it says:
By default, simple variables in Pascal are not initialized after their
declaration. Any assumption that they contain 0 or any other default
value is erroneous: They can contain rubbish.
This is not correct. Global simple variables are always initialized. At
least in Delphi it is so:
http://docwiki.embarcadero.com/RADStudio/Tokyo/en/Variables_(Delphi) "If
you do not explicitly initialize a global variable, the compiler
initializes it to 0."
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Another question about this sentence in FPC docs: "Managed types are
always initialized: in general this means setting the reference count to
zero, or setting the pointer value of the type to Nil."
Does it mean I can assume a local string variable is always (=whenever
the routine is called) initialized to ''? I.e. that TestB always returns
'a'?
function TestB: string;
var B: string;
begin
B := B + 'a';
Result := B;
end;
Until now I though that the above code is unsafe and I always
initialized all local variables (also managed) before use. I assumed the
initialization to empty string does not need to happen at every routine
call.
Ondrej
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