C++14 early adopters: Generic Lambdas (Generic lambda)

The so-called generic Lambda is the lambda that uses the auto type to indicate the specifier in the formal parameter declaration. Like what

Auto lambda = [] (auto x, auto y) {return x + y;};

According to the C++14 standard, this lambda has the same effect as the following code.

struct unnamed_lambda{  template<typename T, TypeName u>    auto Operator () (T x, U y) const {return x + y;}}; Auto lambda = Unnamed_lambda ();

As you can see from the equivalent code, generic lambda has the following characteristics.

1. Lambda is equivalent to a function object, and a generic lambda is equivalent to a function object with template parameters, which acts roughly like a function template with a state.

C++14 early adopters: Generic Lambdas (Generic lambda)