d - Is opIndexAssign possible in C++? -

the d programming language version 2 has nifty method overload expression this:

classinstance[somename] = somevalue; 

or d function defined in this little example:

ref map opindexassign(ref const(valuet) value, ref const(namet) name) {     this.insert(name, value);     return this; } 

is possible in c++ (ideally without using stl)? if so, how?

normally, use proxy object return type of operator[]; object have custom operator= defined. vector<bool> specialization in c++ standard library uses proxy behavior looking for. proxy-based solution isn't transparent d version, though. code like:

class proxy;  class my_map {   public:   proxy operator[](const key_type& k);   // rest of class };  class proxy {   my_map& m;   key_type k;   friend class my_map;   proxy(my_map& m, const key_type& k): m(m), k(k) {}    public:   operator value_type() const {return m.read(k);}   proxy& operator=(const value_type& v) {m.write(k, v); return *this;} };  proxy my_map::operator[](const key_type& k) {   return proxy(*this, k); }