#Move constructor with pointers

30 messages · Page 1 of 1 (latest)

round quest
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when using a move constructor with a pointer member, is it moving the entire pointer itself along with pointer address, or just moving the the address of what the pointer is pointing to?

peak wingBOT
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craggy siren
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what do you mean "using a move constructor"?

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sendcode maybe?

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probably it's just moving the pointer, and not what it is pointing at

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but I'm not clear of the situation you are talking about so itdepends

round quest
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something like this:

MyClass obj2 = std::move(obj1);

With the move constructor:

MyClass(MyClass&& other) noexcept : ptr(other.ptr) {
        other.ptr = nullptr; 
    }```
serene onyx
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I believe pointer is getting moved, but thr issue is i believe you need to do std::exchange for it to set other to null properly

round quest
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i figured it out ty guys

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!solved

peak wingBOT
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Thank you and let us know if you have any more questions!

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serene onyx
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Like

T(T &&other): val{std::exchange(other.val, nullptr)}
round quest
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ty for heads up

white basin
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what do you mean "move the pointer with the pointer address"

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a pointer is the address

white basin
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it's equivalent to setting it to nullptr later

serene onyx
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So if you have a dtor it'll free it possibly

white basin
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a pointer has no destructor

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in your move constructor you need to copy the other's pointer and then set it to null

serene onyx
serene onyx
white basin
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how is this relevant to the move constructor tho?

white basin
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... ptr(other.ptr) {
    other.ptr = nullptr;
}```
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does the same thing

serene onyx
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Sure but its just like why

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Already have something which does it

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