C++ High Performance

Mutating member variables from the compiler's perspective

To understand what's going in the above example, take a look at how the compiler sees the previous lambda objects:

Capture by value case	Capture by reference case
class MutatingLambda {public: MutatingLambda(int m) : v{m} {} auto operator()() { std::cout<< v <<" "; ++v; }private: int v{};};	class MutatingLambda {public: MutatingLambda(int& m) : v{m} {} auto operator()()const{ std::cout<< v <<" "; ++v; }private: int& v;};

As you can see, the first case corresponds to a class with a regular member, whereas the capture by reference case simply corresponds to a class where the member variable is a reference.

You might have noticed that we add the modifier const on the ...