Modern C++ Programming Cookbook

Getting ready

It is recommended that you read the recipe Using range-based for loops to iterate on a range before continuing with this one if you need to understand how range-based for loops work and what is the code the compiler generates for such a loop.

To show how we can enable range-based for loops for custom types representing sequences, we will use the following implementation of a simple array:

    template <typename T, size_t const Size>     class dummy_array     {       T data[Size] = {};     public:       T const & GetAt(size_t const index) const       {         if (index < Size) return data[index];         throw std::out_of_range("index out of range");       }       void SetAt(size_t const index, T const & value)       {         if (index < Size) data[index] = value;  else throw std::out_of_range("index ...