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C++17 in Detail: A Deep Dive

Named Return Value Optimization

Explore Named Return Value Optimization in C++17 to understand how modern compilers optimize return values by eliminating unnecessary copies, improving performance, and following new clear rules on object elision.

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Compilers and NRVO

Compilers are even smarter, and they can el​ide in cases when you return a named object - it’s called Named Return Value Optimization - NRVO

C++
Test Create()
{
  Test t;
  // several instruction to initialize 't'...
  return t;
}
auto n = Create(); // temporary will be usually    elided
...