What are some examples of STL sets in C++?

What are some examples of STL sets in C++?

In C++, the Standard Template Library (STL) provides a set container that stores unique elements in a specific order. Here are a few examples:

1. Basic Set: std::set<int> mySet; - This creates a set of integers.
2. Set with Custom Comparator: std::set<std::string, std::greater<std::string>> mySet; - This creates a set of strings sorted in descending order.
3. Set Initialization: std::set<int> mySet = {1, 2, 3, 4}; - This initializes a set with values 1 to 4.

Can you explain how to insert elements into a set?

Certainly! You can insert elements into a set using the insert method. For example:

std::set<int> mySet;
mySet.insert(10);
mySet.insert(20);
mySet.insert(10); // This will not be added again since sets contain unique elements.

This will result in mySet containing 10 and 20.

What happens if I try to insert a duplicate element?

If you try to insert a duplicate element into a set, the set will ignore the insertion and remain unchanged. For example:

mySet.insert(10); // This will not add another 10.

The size of the set will not increase.

How can I iterate over the elements in a set?

You can iterate over the elements in a set using a range-based for loop or an iterator. For example:

for (const auto& element : mySet) {
    std::cout << element << " ";
}

This will print all the elements in the set.