(Optional) C++ - Lambda Expressions

Introduction

Anything more beginner-friendly?

Recursive Lambdas

If we add the following from the link above in C++14:

1namespace std {
2
3template<class Fun>
4class y_combinator_result {
5  Fun fun_;
6public:
7  template<class T>
8  explicit y_combinator_result(T &&fun): fun_(std::forward<T>(fun)) {}
9
10  template<class ...Args>

Then we can have code like the following!

1int main() {
2  cout << y_combinator([](auto gcd, int a, int b) -> int {
3    return b == 0 ? a : gcd(b, a % b);
4  })(20,30) << "\n"; // outputs 10
5}

Looks like ecnerwala uses these a lot.