In such a situation I tend to define my own nullptr:
struct nullptr_t { template<class T> operator T* () const { return 0; } } nullptr;
and use that instead of NULL. Thanks, Peter. Both casting and nullptr worked fine. But it brings me to a bigger question, should I bother replacing this code:
struct c{void f(char*){}}; typedef std::map<int,c*> TMap; TMap a; for(TMap::iterator i=a.begin();i!=a.end();++i)(*a)->second.f(NULL): with the more complex code like this: struct c{void f(char*){}}; struct nullptr_t{template<class T>operator T*()const{return 0;}}nullptr; typedef std::map<int,c*> TMap; TMap a; std::for_each(a.begin(),a.end(), boost::bind(&c::f, boost::bind(&TMap::value_type::second,_1), nullptr) ); I know there should be a line. But I am new to the algorithm's way :) Thanks. -- Regards, Alexander. http://sjcomp.com