Member pointer to array element

Question

It\'s possible to define a pointer to a member and using this later on:

struct foo
{
  int a;
  int b[2];
};


int main()
{

  foo bar;
  int foo::*          


        

Answer 1

You can't do that out of the language itself. But you can with boost. Bind a functor to some element of that array and assign it to a boost::function:

#include 
#include 
#include 
#include 

struct test {
    int array[3];
};

int main() {
    namespace lmb = boost::lambda;

    // create functor that returns test::array[1]
    boost::function f;
    f = lmb::bind(&test::array, lmb::_1)[1];

    test t = {{ 11, 22, 33 }};
    std::cout << f(t) << std::endl; // 22

    f(t) = 44;
    std::cout << t.array[1] << std::endl; // 44
}