How to assign a pair?

Question

C++ / C#

Can you explain to me why this doesn't compile?

pair<const string, int> p1("x", 123);
pair<const string, int> p2("y", 321);
p1 = p2;

Says something about a remote assignment operator. I don't understand what's wrong... The most interesting thing is that if the strings are not constant, then everything works.

Answer 1

Your assignment does p1.first = p2.firstand p1.second = p2.second. But you prevented assigning to p1.firstby declaring it as const.