Modern C++: Efficient and Scalable Application Development

How to do it...

Write generic lambdas:

• By using the auto specifier instead of actual types for lambda expression parameters.
• When you need to use multiple lambdas that only differ by their parameter types.

The following example shows a generic lambda used with the std::accumulate() algorithm first with a vector of integers and then with a vector of strings.

        auto numbers =          std::vector<int>{0, 2, -3, 5, -1, 6, 8, -4, 9};          auto texts =            std::vector<std::string>{"hello"s, " "s, "world"s, "!"s};         auto lsum = [](auto const s, auto const n) {return s + n;};         auto sum = std::accumulate(           std::begin(numbers), std::end(numbers), 0, lsum);           // sum = 22         auto text = std::accumulate(           std::begin(texts), std::end(texts), ""s, lsum);  // sum = "hello ...