dict<K,V> does not have const operator[]

[jeremysalwen]

It might be nice to have a const operator[] in the dict class, for accessing elements from const dicts.

[cliffordwolf]

T& dict<>::operator[](const K &key) creates the entry with its default constructor when it is not already in the dict. You can't do that with a const dict<>. Use const T& dict<>::at(const K &key) const to access an already existing entry (throws std::out_of_range for non existing entries).