On 14.04.2018 9:59, Michael Van Canneyt wrote:
On Sat, 14 Apr 2018, Ondrej Pokorny wrote:
On 02.07.2017 18:49, Jonas Maebe wrote:
I would be in favour of a new intrinsic.
I have to admit that for some usages I would prefer a compiler
intrinsic that returns False instead of raising an exception.
Something like:
function TryIntToEnum<T: type of enum>(const AValue: Integer; var
AEnumValue: T): Boolean;
Please, don't use this ridiculous generics syntax. If it is a compiler
intrinsic, then
function TryIntToEnum(T: atype; const AValue: Integer; var AEnumValue:
aType): Boolean;
will work, just like typeinfo() or sizeof() works.
The syntax I used was just for illustration. You don't type the <T: type
of enum> part in your own code.
What I wanted to tell was that you can omit the enum type parameter (the
first parameter "T: atype" from your function). The type should be
possible to get directly from AEnumValue: aType:
function TryIntToEnum(const AValue: Integer; var AEnumValue: aType):
Boolean; // aType being an enum type
- If you like this description more :)
Effectively, you should be able to use:
var
E: TMyEnum;
begin
if TryIntToEnum(1, E) then
instead of
if TryIntToEnum(TMyEnum, 1, E) then
Ondrej
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