🚀 go-pugleaf

In article VAA26445@andrew.cmu.edu, Jody Goldberg <jody+@cmu.edu> writes:
>Is this ambiguous ?
>
>struct A
>{
>    operator int *();
>    operator int const *();
>};
>
>void f()
>{
>    A a;
>    int i = a[0];
>}

I believe it is ambiguous. The right side of the assignment requires
an int rvalue. Dereferencing the result of either conversion function
yields an int rvalue, so I don't see a way to choose between them.

You could use an explicit cast to choose one or the other:
    int j = ((const int*)a)[0];
    int k = ((int*)a)[0];

Type conversion operators in general tend to lead to ambiguities, and
often cause more problems than they solve. Having more than one in the
same class is much more likely to create ambiguities.
---
Steve Clamage, stephen.clamage@eng.sun.com



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