I have noticed it is possible to register enum values with the same name as long as they belong to different enums, even though they have "global" scope. This, of course, can result in the same identifier resolving to multiple enum values. There is a compile error "Found multiple matching enum values" when the script writer attempts to use one of these enum values without a scope.
I believe in many of these circumstances, although there are multiple matching enum values, the enum value to use is not ambiguous. Consider the following example:
enum Enum1
{
Yes,
No
};
enum Enum2
{
Yes,
No,
Maybe
};
void func()
{
Enum1 e = Yes;
}
It should be possible to resolve the appropriate Enum1::Yes from the left-hand side of the assignment.
I say this knowing that you compile the right side before compiling the left side. I found this section "asCCompiler::CompileVariableAccess", as_compiler.cpp, line 7441:
// Look for the enum value without explicitly informing the enum type
asSNameSpace *ns = DetermineNameSpace(currScope);
int e = 0;
if( ns )
e = builder->GetEnumValue(name.AddressOf(), dt, value, ns);
if( e )
{
found = true;
if( e == 2 )
{
Error(TXT_FOUND_MULTIPLE_ENUM_VALUES, errNode);
}
}
The comment refers to what would be necessary to resolve the ambiguity. Is it possible to know the destination type at this point in the code?
At first glance, it looks like you would have to utilize a member in asSExprContext (similar to the use of "methodName") to hold the possible enum types for resolution later. This would probably be very much like resolving a object's implicit casts. Does this sound like a reasonable approach? Do you object in principle to the idea of resolving enum-value ambiguity, or might this be something worth doing? If I am on the right path, I think I could implement it myself.
Obviously, unique enum-value names or proper scoping resolves all ambiguity. My application's script writers are not experienced programmers though, so I do prefer to spare them from long enum-value names and scoping if I can help it.
Thank you for your consideration.
