i am having problems compiling class derived from boost::multi_array. the copy constructor does not compile. as i understand, the usual copy constructor for derived class can be implemented as in line 12 in the code below. however, can't do the same for boost::multi_array at line 21. lots of compile error, i extracted a small part of it below 1 #include 2 3 // ------------------------------------------ 4 template<class V> struct base { 5 base(int y) : u(y ) { } 6 base(const base<V>& b) : u(b.u) { } 7 int u; 8 }; 9 10 template<class V> struct derived : public base<V> { 11 derived(int y) : base<V>(y) { } 12 derived(const derived<V>& d) : base<V>(d) { } 13 }; 14 // ------------------------------------------ 15 template 16 struct my_multi : public boost::multi_array { 17 18 template<class extent_type> 19 my_multi(const extent_type& e) : boost::multi_array(e) { } 20 21 my_multi(const my_multi& t) : boost::multi_array(t) { } 22 }; 23 // ------------------------------------------ 24 int main () { 25 derived<int> d(1.0); 26 derived<int> e(d); // ok 27 28 my_multi mm0(boost::extents[3][4]); 29 mm0[0][0] = 6; // ok 30 my_multi mm1(mm0); 31 } -------------- extracted compile error: bmulti.C:21: instantiated from 'my_multi::my_multi(const my_multi&) [with V = int, unsigned int D = 2u]' bmulti.C:30: instantiated from here /opt/local/include/boost/multi_array/collection_concept.hpp:44: error: 'struct my_multi' has no member named 'swap' bmulti.C:21: instantiated from 'my_multi::my_multi(const my_multi&) [with V = int, unsigned int D = 2u]' bmulti.C:30: instantiated from here /opt/local/include/boost/multi_array/algorithm.hpp:56: error: cannot convert 'boost::detail::multi_array::const_sub_array' to 'long unsigned int' in assignment