question of enum

[Wat]

When read a sample code using "enum", it uses min and max values for "enum"
type.

enum MyType
{
MyType_Min,
...
MyType_Max
};

Are MyType_Min and MyType_Max used for checking the value range of "MyType"
when using "MyType" type?

Thanks for your comments!

[Mike Wahler]

Re: question of enum


"Wat" <welwat@hotmail .com> wrote in message
news:bhRvd.1266 91$7i4.39519@bg tnsc05-news.ops.worldn et.att.net...[color=blue]
> When read a sample code using "enum", it uses min and max values for[/color]
"enum"[color=blue]
> type.
>
> enum MyType
> {
> MyType_Min,
> ...
> MyType_Max
> };
>
> Are MyType_Min and MyType_Max used for checking the value range of[/color]
"MyType"[color=blue]
> when using "MyType" type?[/color]

We cannot tell without seeing the code that uses them. But they could be.

I have seen an extra 'dummy' enumeration value placed last in
a default sequential enumeration for the purpose of denoting the number
of values in an enum.

enum e
{
a,
b,
z
};

cout << "number of enum values: " << z << '\n';

If we insert other names anywhere before 'z', 'z' still gives
the correct result. (this of course falls apart if any of the
values are given other than default values).

-Mike
[color=blue]
>
> Thanks for your comments!
>
>[/color]

[Siemel Naran]

Re: question of enum

"Wat" <welwat@hotmail .com> wrote in message
news:bhRvd.1266 91$7i4.39519@bg tnsc05-
[color=blue]
> When read a sample code using "enum", it uses min and max values for[/color]
"enum"[color=blue]
> type.
>
> enum MyType
> {
> MyType_Min,
> ...
> MyType_Max
> };[/color]

I often start my enums at 0, so there is no Type_Min, but there is a
Type_Max. I then use this in max value as the size of an array. For
example,

enum Status { Open, Closed, Status_Max };
string Status_text[Status_Max] = { "Open", "Closed" };

In another usage, I have macros

#define define_enum_one _operators(Enum ,T,min,max) \
friend inline Enum& operator++(Enum & e) { ... } \
...