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Facing a little issue with gcc ( maybe all c compiler have behaves
this way for the problem)

Got a function that takes in a enumerated type. Even if another
enumerated type is passed 'gcc' does not raise any warnings or error.
'g++' generates a error msg for the same. Is there a way to turn on
enum type checks while passing to functions in 'gcc'.


code snippet:


typedef enum {
gcc_enum_type1_val1,
gcc_enum_type1_val2,
gcc_enum_type1_val3,
} gcc_enum_type1_t;

typedef enum {
gcc_enum_type2_val1,
gcc_enum_type2_val2,
gcc_enum_type2_val3,
} gcc_enum_type2_t;


unsigned int foo(gcc_enum_type2_t val)
{
return (unsigned int) val;
}


int main()
{
unsigned int i;
i = foo(gcc_enum_type1_val1);
return 0;
}

gcc compiles the program without any issues.
'g++' complains:
xx.cpp: In function `int main()':
xx.cpp:nn: error: cannot convert `gcc_enum_type1_t' to
`gcc_enum_type2_t' for
argument `1' to `unsigned int foo(gcc_enum_type2_t)'

I want a similar type check in 'gcc' or it is not possible ic 'C'.

Thanks
Pritam

Pritam wrote:
> Facing a little issue with gcc ( maybe all c compiler have behaves
> this way for the problem)
>
> Got a function that takes in a enumerated type. Even if another
> enumerated type is passed 'gcc' does not raise any warnings or error.
> 'g++' generates a error msg for the same. Is there a way to turn on
> enum type checks while passing to functions in 'gcc'.
>
That's a "feature" of C, corrected in C++!

Enums aren't really types in C.

--
Ian Collins.

Ian Collins <ian-> writes:

> Pritam wrote:
>> Facing a little issue with gcc ( maybe all c compiler have behaves
>> this way for the problem)
>>
>> Got a function that takes in a enumerated type. Even if another
>> enumerated type is passed 'gcc' does not raise any warnings or error.
>> 'g++' generates a error msg for the same. Is there a way to turn on
>> enum type checks while passing to functions in 'gcc'.
>>
> That's a "feature" of C, corrected in C++!
>
> Enums aren't really types in C.

Are they not just ints?

Richard wrote:

> Ian Collins <ian-> writes:
>
>> Pritam wrote:
>>> Facing a little issue with gcc ( maybe all c compiler have behaves
>>> this way for the problem)
>>>
>>> Got a function that takes in a enumerated type. Even if another
>>> enumerated type is passed 'gcc' does not raise any warnings or error.
>>> 'g++' generates a error msg for the same. Is there a way to turn on
>>> enum type checks while passing to functions in 'gcc'.
>>>
>> That's a "feature" of C, corrected in C++!
>>
>> Enums aren't really types in C.
>
> Are they not just ints?

The /constants/ are just ints, but the `enum wossname`s aren't; they're
(impoverished) types. I took Ian to mean the sort-of-type Enum, not the
named-elements-of.

--
"What would that matter, if it made a good book?" /Gaudy Night/

Hewlett-Packard Limited registered office: Cain Road, Bracknell,
registered no: 690597 England Berks RG12 1HN

Chris Dollin wrote:
> Richard wrote:
>
>> Ian Collins <ian-> writes:
>>
>>> Pritam wrote:
>>>> Facing a little issue with gcc ( maybe all c compiler have behaves
>>>> this way for the problem)
>>>>
>>>> Got a function that takes in a enumerated type. Even if another
>>>> enumerated type is passed 'gcc' does not raise any warnings or error.
>>>> 'g++' generates a error msg for the same. Is there a way to turn on
>>>> enum type checks while passing to functions in 'gcc'.
>>>>
>>> That's a "feature" of C, corrected in C++!
>>>
>>> Enums aren't really types in C.
>> Are they not just ints?
>
> The /constants/ are just ints, but the `enum wossname`s aren't; they're
> (impoverished) types. I took Ian to mean the sort-of-type Enum, not the
> named-elements-of.
>
I did. I'll stick with "impoverished types", from now on

--
Ian Collins.