Vector<Foo> x;
....
x.At(i) = x[q];
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Problem: At invalidates references to Vector; if x[q] gets evaluated first, the reference can be later invalidated by At. (Note: Array does not have the same problem).
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Vector<Foo> x;
....
const Foo& s = x.Top();
x.Add() = s;
....
x.Add(x.Top());
....
x.Add(x[0]);
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Very similar to above problem, only more explicit.
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void MyFn(Array<Foo> x);
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This is in most cases a bug - U++ containers have "pick transfer semantics", means that such function destroys the real parameter. (Rarely, however, this can be on purpose).
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int x = Null;
double y = x;
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C++ knows nothing about U++ Null concept, y will not be a Null. Note that Value is aware about the Null, so this code:
int x = Null;
Value v = x;
double y = v;
behaves as expected.
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