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C++17 in Detail: A Deep Dive

in_place Construction

Explore how in_place construction works in C++17's std::optional to efficiently create objects and use default constructors. This lesson helps you understand advantages like improved performance when initializing wrapped objects with multiple arguments.

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std::optional is a wrapper type, so you should be able to create optional objects almost in the same way as the wrapped object. And in most cases you can:

C++ 17
#include <iostream>
#include <optional>
using namespace std;
int main() {
  std::optional<std::string> ostr{"Hello World"};
  std::optional<int> oi{10};
  cout << *ostr << endl;
  cout << *oi << endl;
}

You ...