Hi I have just started experimenting with proto. I have the following grammer G ::= Apply f G | Arrray where the code of the simple array and apply classes are given below: How can I transform this code in the proto template<typename T> class Array {  public:   Array(int size) : size(size)   {        data = new T[size];   }   operator=() { ... }  private:  int size;  T* data; }; I have another class apply that applies the function (its first argument) on its other arguments template<typename F, typename EXP> struct apply {    Array<typename F::result_type>& operator()(EXP & exp)    { ... }   typename F::result_type operator[](typename F::input_type i)   {       return f(i);   } }; The Apply class can be a unary or binary or infact an n-ary class. How can I protofy this expression template? Regards Noman Javed Orléans, France