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compile visual studio c++ online
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#include <iostream> struct C { C(const C& in) { std::cout << "C(&) <-- copy\n";} C(C&& in) {} C() {} ~C() {} }; struct D { C c; D(C _c) : c(std::move(_c)) { std::cout << "D(C)\n";} }; D test_RVO() { C c; return D(std::move(c)); } D test_NRVO() { C c; D d(std::move(c)); return d; } int main() { std::cout << "RVO\n"; test_RVO(); std::cout << "\nNRVO\n"; test_NRVO(); }
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Compilation time: 1.12 sec, absolute running time: 0.07 sec, absolute service time: 1.2 sec
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RVO D(C) C(&) <-- copy NRVO D(C)