[fpc-devel] type question

[Peter Vreman]

> On Saturday 14 October 2006 15:55, Marc Weustink wrote:
>> Hi,
>>
>> if I define 2 types like:
>>
>> type
>>   MyA = type string;
>>   MyB = type string;
>>
>> are MyA and MyB considered as the same type ?
>
> No, you are explicitly marking them as a new type. This is a very cool
> feature
> of Pascal you wont find in many other languages.
>
> (For instance, you could use it to create a new integer-type for little-
> and
> big-endian numbers, ensuring that you _never_ directly assign a
> little-endian
> number to a big-endian one, or vice versa)

For the compiler the types are not equal anymore, but they are still
compatible for implicit type conversion. This has mainly impact on
overload choosing and parameter passing. Normal assignments using ':=' are
not affected because of the still available implicit type conversion.