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Questions - move

Why was it nessesury to allow std::move accept reference to lvalue besides reference to rvalue in Uref embodiment for both?

Considering that rvalue-ness and lvalue-ness are not a features of objects but of expressions. Why isn't std::move implemented only for lvalue reference argument, but for universal one? Whereas it is ...
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Max Popov

c++

move

rvalue

lvalue

Votes: 0

Answers: 1

Latest Answer

Why isn't std::move implemented only for lvalue reference argument, but for universal one? Because lvalue references to non-const cannot be bound to xvalues. When rvalue is rvalue already and it do...
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eerorika

Is it impossible to sort custom class with const member by move symantic?

I saw this answer. https://stackoverflow.com/a/47317853/8106257 But, I don't satisfying logical const. Is there any other way to sort custom class object with const member variable? I was firstly thou...
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신승빈

c++

sorting

constants

move

Votes: 0

Answers: 2

Latest Answer

You can't sort your std::vector because the std::sort uses move assignment and move construction to sort the elements. If you take a look here: sort you will find: Type requirements: The type of der...
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Klaus

Unity | Get backward vector and play turn anim

Struggling with the implementation of character rotation animation by 180 degrees. For clarity, I made a Pivot, which indicates the target of the direction, then compares the angle between the directi...
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Alexey

unity-game-engine

move

target

direction

turn

Votes: 0

Answers: 0

Trying to understand move semantics

I'm studying the 'move semantics' introduced since C++11. I wrote a sample code for creating class objects using normal constructors, a copy constructor, and a move constructor. /* Useless.cpp */ #inc...
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Sooyoung Moon

c++

c++11

move

Votes: 0

Answers: 1

Latest Answer

That's copy elision and return value optimization in action. See copy elision. In gcc/clang you can disable it using -fno-elide-constructors and then you'll get your 5th object.
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danadam

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