A Anonymous Function in C++.
auto res = [](int x) { return x + x; };
cout << res(5);Capture Clause
The first segment of a lambda function is its capture clause [].
[&]: capture all external variables by reference[=]: capture all external variables by value[a, &b]: capture variable ‘a’ by value, b by refernce
std::string search{};
std::cin >> search;
// Capture @search vvvvvv
auto found{ std::find_if(arr.begin(), arr.end(), [search](std::string_view str) {
return str.find(search) != std::string_view::npos;
}) };