[SAoC] 'DPP with Linux kernel headers' Project Thread

[Cristian Becerescu]

On Saturday, 16 November 2019 at 18:39:51 UTC, Patrick Schluter 
wrote:
> On Saturday, 16 November 2019 at 14:59:51 UTC, Cristian 
> Becerescu wrote:
>>
>> ---Bug #4---
>> An enum is initialized with a value of 68719476704, which 
>> produces this:
>> Error: cannot implicitly convert expression 68719476704L of 
>> type long to int
>>
>> I will probably need to check if some values of the enum are > 
>> int.max, and, if so, declare "enum : long" instead of "enum".
>
> Shouldn't that be done automatically by the D compiler? It's 
> normal promotion rule, it should reflect in the base type of 
> the enum. Afaict it is done that way in C (at least as an 
> extension to gcc).

I tested some cases.

enum e { A = 68719476704 }; // Compiles fine
enum e { A = 68719476704, B = 1 }; // Still compiles fine
enum e { B = 1, A = 68719476704 }; // Error: cannot implicitly 
convert expression 68719476704L of type long to int

I looked through the docs [1] and found this:
"If the EnumBaseType is not explicitly set, and the first 
EnumMember has an AssignExpression, it is set to the type of that 
AssignExpression. Otherwise, it defaults to type int."

[1] https://dlang.org/spec/enum.html