Re: enums and switch vs function calls

On 05/04/2025 13:26, Stefan Ram wrote:

Richard Harnden <richard.nospam@gmail.invalid> wrote or quoted:

int hex = colour_to_hex(10);
... then the compiler doesn't complain that 10 is not in the enum.
Why? Surely the compiler can tell.

    I get
 |
|error: enum conversion when passing argument 1 of 'colour_to_hex' is invalid in C++ [-Wc++-compat]
|      |int hex = colour_to_hex(10);
|      |                        ^~
|note: expected 'enum colour' but argument is of type 'int'
|      | int colour_to_hex(enum colour colour)
|      |     ^~~~~~~~~~~~~
|
    with
 gcc -Wc++-compat
 

Yes.  In C++, the enumeration constants are of the enumeration type, while in C they are "int".
It would be nice if gcc had a warning for this kind of thing (for those that choose to enable it).