Hi enum values conflict for C++ is there any solution now solution
suggested below is available in latest version any workarounds to handle
this problem with 2.4.1 or latert versions.
Giri
On Friday, 20 August 2010 23:42:30 UTC+5:30, alopecoid wrote:
> Hi,
>
> This post is about the fact that protobuf enum values use C++ scoping
> rules, meaning that, unlike in Java, enum values are siblings of their
> type, not children of it.
>
> Say I have the following contrived message:
>
> message MyMessage {
> enum Foo {
> FIRST = 0;
> SECOND = 1;
> BOTH = 2;
> }
> required Foo foo = 1;
>
> enum Bar {
> FIRST = 0;
> SECOND = 1;
> BOTH = 2;
> }
> required Bar bar = 2;
> }
>
> This wouldn't compile because the protobuf compiler recognizes the
> fact that for C++, the generated enum values for Foo and Bar would
> conflict with each other.
>
> However, for Java, this wouldn't be a problem. I would like to propose
> that instead of "punishing" the generated Java code because of C++'s
> strange enum behavior (by forcing developers to rename their enum
> values even though they don't collide), that instead, the generated C+
> + enum declarations are wrapped in their own nested namespaces? For
> example, something like:
>
> namespace Foo {
> enum Enum {
> FIRST = 0;
> SECOND = 1;
> BOTH = 2;
> }
> }
>
> namespace Bar {
> enum Enum {
> FIRST = 0;
> SECOND = 1;
> BOTH = 2;
> }
> }
>
> At this point, the enum values would be accessed like Foo::FIRST,
> Bar::FIRST, etc, which would eliminate the enum value collision
> problem altogether, and at the same time make them appear to behave
> more like Java's enum scoping rules (which arguably make more sense).
>
> Thoughts?
>
> Thank you.
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