What is the difference between map::emplace and map::insert in C++11?

Can you explain the difference between map::emplace and map::insert in C++11?

Sure! In C++11, map::emplace constructs an element in place, while map::insert copies or moves an element.

So, does emplace provide better performance than insert?

Yes, emplace can be more efficient because it avoids unnecessary copies or moves by constructing the element directly in the map.

Are there any scenarios where I should prefer insert over emplace?

You might prefer insert when you already have an object ready to be added, or when you want to insert a pair directly.

Can you give an example of using both in code?

Certainly! Here's a quick example:

std::map<int, std::string> myMap;
myMap.emplace(1, "one"); // Constructs in place
std::pair<int, std::string> p(2, "two");
myMap.insert(p); // Inserts a pair