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C++17 in Detail: A Deep Dive

Overload

Explore how to implement the overload pattern in C++17 using lambdas and std::variant. Understand key C++17 features like pack expansions, template argument deduction, and aggregate initialization that enable efficient and type-safe visitation of variant types.

We'll cover the following...

With this utility you can write all lambdas for all matching types in one place:

C++
std::variant<int, float, std::string> myVariant; 
std::visit
(
  overload (
    [](const int& i) { std::cout << "int: " << i; },
    [](const std::string& s) { std::cout << "string: " << s; }, 
    [](const float& f) { std::cout << "float: " << f; }
  ),
  myVariant;
);

Currently, this helper is not a part of the Standard Library (it might be ...