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Questions about elision

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Questions - elision

Why destructor is called if the return operation is elided?

I have the following code that mimics an elision testcase class Obj { public: int x = 0; Obj(int y) : x(y) {std::cout << "C\n"; } ~Obj() { std::cout << "D\n"; }...
test-img

Matteo Galeotti

c++

gcc

c++17

copy-elision

elision

Votes: 0

Answers: 1

Latest Answer

With the initializer list construction: std::vector<Obj> vec {1,2,3}; First the initializer_list is constructed, with all 3 Obj objects. Only then is the constructor of std::vector invoked, cop...
test-img

Michael Veksler

Why do relaxed atomic operations prevent compiler optimizations?

C++ compilers are allowed to elide or combine allocations. However, it seems that if allocated memory is accessed with atomic operations (even with relaxed memory order) that allocation cannot be elid...
test-img

Altan

c++

gcc

clang

atomic

elision

Votes: 0

Answers: 1

Latest Answer

You use it in some function so you cannot say it may be optimized out. If you replace a atomic operation with external function it will be the same: https://godbolt.org/z/GsYjrb6z5
test-img

Karol T.

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