qAsConst() deprecated

[ChortleMortal]

Seeing that qAsConst() is now deprecated, I have this question about preventing detachment.

Given
QList<Edge> edges;

for (auto & edge : std::as_const(edges))
{
    doSomething(edge);
}

for (const auto & edge : edges)
{
    doSomething(edge);
}

Are these two ways doing exactly the same thing, or does the second way detach?

[Chris Kawa]

@ChortleMortal Second one detaches. It's equivalent to

for (auto it = edges.begin(); it != edges.end(); ++it)
{
   const auto& edge = *it;
   doSomething(edge);
}

It doesn't matter if edge is const or not. Detach happens on the call to begin() on non-const container, so before the assignment to the variable even takes place.

[ChortleMortal]

@Chris-Kawa
Thanks so much Chris. You have saved me from making a systematic errror. Much appreciated.

[Volker75]

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