===== C++17 default: optional NRVO enabled ===== ===== C++17 -fno-elide-constructors ===== ./rvo-nrvo.out ./rvo-nrvo-no-elide.out

=== 1. C++17 guaranteed RVO: return A(10) === === 1. C++17 guaranteed RVO: return A(10) === constructor: value=10 constructor: value=10 result: value=10 result: value=10 destructor: value=10 destructor: value=10

=== 2. optional NRVO: return named result === === 2. optional NRVO: return named result === constructor: value=20 constructor: value=20 result: value=20 move constructor: take value=20 destructor: value=20 destructor: value=-1 result: value=20 === 3. explicit std::move construction === destructor: value=20 constructor: value=30 move constructor: take value=30 === 3. explicit std::move construction === destructor: value=-1 constructor: value=30 result: value=30 move constructor: take value=30 destructor: value=30 move constructor: take value=30 destructor: value=-1 === 4. copy construction for comparison === destructor: value=-1 constructor: value=40 result: value=30 copy constructor: value=40 destructor: value=30 result: value=40 source: value=40 === 4. copy construction for comparison === destructor: value=40 constructor: value=40 destructor: value=40 copy constructor: value=40 result: value=40 === 5. move assignment into an existing object === source: value=40 constructor: value=50 destructor: value=40 constructor: value=20 destructor: value=40 move assignment: take value=20 destructor: value=-1 === 5. move assignment into an existing object === target: value=20 constructor: value=50 destructor: value=20 constructor: value=20 move constructor: take value=20 destructor: value=-1 move assignment: take value=20 destructor: value=-1 target: value=20 destructor: value=20

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