Is is correct by the standard to cast std::pair<T1,T2>& to std::pair<const T1,T2>& ?
I have some customized map object which holds its inner key-value pair as std::pair<Key,Value>.
I want to give to possibility to iterate over the map with an iterator,
with the possibility to change the value, but not the key.
trying to static_cast the type pair<K,V>& to pair<const K,V>& with VC++ fails.
I could do it with reinterpret_cast tricks, but I wonder if it is safe by the standard.
and if not, is there any possibility to expose pair<K,V>& as pair<const K,V>& that doesn't require re-write
the class ?
