Insert pair as map value

Question

typedef pair<unsigned char, unsigned char> pair_k;
map<unsigned char, pair_k> mapping;

Which will be used this way:

mapping[100] = make_pair(10,10);

Question is:

1. Is this allowed? Syntaxically, it feels alright.
2. Would this be access as an array as oppose to a map?

Answer 1

That looks ok to me. But note that this is not array access; it just looks like it because std::map overloads operator[]. If you do mapping.size() afterwards, you will find that it will be 1.