hi, i can build a map, but not a boost::ptr_map. could someone please help? thank you, e. #include using std::map; using std::cout; using std::endl; class A{ public: A(double x_):x(x_){}; const double x; }; int main(){ map map_A; //cannot use map //because A() not defined //why? because A has const members. A a(0.0); map_A[0]=new A(0.0);//fine boost::ptr_map ptr_map_A; ptr_map_A[0]=new A(0.0);//not fine return 0; }; **** Build of configuration Debug for project testing_map **** make -k all Building file: ../main.cpp Invoking: GCC C++ Compiler g++ -I/usr/local/boost_1_34_1 -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"main.d" -MT"main.d" -o"main.o" "../main.cpp" ../main.cpp:25:3: warning: no newline at end of file ../main.cpp: In function ‘int main()’: ../main.cpp:22: error: no match for ‘operator=’ in ‘ptr_map_A.boost::ptr_map > >::<anonymous>.boost::ptr_map_adapter > >, boost::heap_clone_allocator>::<anonymous>.boost::ptr_container_detail::ptr_map_adapter_base::operator[] [with T = A, VoidPtrMap = std::map > >, CloneAllocator = boost::heap_clone_allocator](((const unsigned int&)((const unsigned int*)(&0u)))) = (((A*)operator new(8u)), (<anonymous>->A::A(0.0), <anonymous>))’ ../header.h:4: note: candidates are: A& A::operator=(const A&) /usr/local/boost_1_34_1/boost/ptr_container/ptr_map_adapter.hpp: In member function ‘typename boost::ptr_container_detail::associative_ptr_container, CloneAllocator>::reference boost::ptr_container_detail::ptr_map_adapter_base::insert_lookup(const typename boost::ptr_container_detail::associative_ptr_container, CloneAllocator>::key_type&) [with T = A, VoidPtrMap = std::map > >, CloneAllocator = boost::heap_clone_allocator]’: /usr/local/boost_1_34_1/boost/ptr_container/ptr_map_adapter.hpp:268: instantiated from ‘typename boost::ptr_container_detail::associative_ptr_container, CloneAllocator>::reference boost::ptr_container_detail::ptr_map_adapter_base::operator[](const typename boost::ptr_container_detail::associative_ptr_container, CloneAllocator>::key_type&) [with T = A, VoidPtrMap = std::map > >, CloneAllocator = boost::heap_clone_allocator]’ ../main.cpp:22: instantiated from here /usr/local/boost_1_34_1/boost/ptr_container/ptr_map_adapter.hpp:168: error: no matching function for call to ‘A::A()’ ../header.h:6: note: candidates are: A::A(double) ../header.h:4: note: A::A(const A&) make: *** [main.o] Error 1 make: Target `all' not remade because of errors. Build complete for project testing_map