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C++17 in Detail: A Deep Dive

A Basic Example Of std::optional

Let's look at std::optional in action.

We'll cover the following...

Here’s a simple example of what you can do with optional:

C++
// UI Class...
std::optional<std::string> UI::FindUserNick()
{
  if (IsNickAvailable())
    return mStrNickName; // return a string
  
  return std::nullopt; // same as return { };
}
// use:
std::optional<std::string> UserNick = UI->FindUserNick();
if (UserNick)
  Show(*UserNick);

In the above code, we define a function that returns an ...