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C++17 in Detail: A Deep Dive

Guaranteed Copy Elision

This part introduces the concept of Copy Elision and its role in optimization.

We'll cover the following...

Copy Elision is a common optimisation that avoids creating unnecessary temporary objects.

Copy Elision Example

For example:

C++ 17
#include <iostream>
using namespace std;
struct Test
{
  Test() { std::cout << "Test::Test\n"; }
  Test(const Test&) { std::cout << "Test(const Test&)\n"; }
  Test(Test&&) { std::cout << "Test(Test&&)\n"; }
  ~Test() { std::cout << "~Test\n"; }
};
Test Create()
{
  return Test();
}
int main()
{
  auto n = Create();
}

In the above call, you might assume a temporary copy is used - to store the ...