How do I use emplace vs push with std::set?

In C++, the `std::set` container allows the storage of unique elements in a specific order. When adding elements to a `std::set`, you can use either `emplace` or `insert` (often confused with `push` in other containers). The choice between these two methods can impact the performance of your code depending on the context.

Using Emplace vs Insert with std::set

The `insert` method adds copies or moves of the object to the set. In contrast, `emplace` constructs the object in place and can be more efficient as it avoids unnecessary copies.

Example of using emplace vs insert


        #include <set>
        #include <iostream>

        struct MyStruct {
            int value;
            MyStruct(int v) : value(v) {}
            bool operator<(const MyStruct &other) const {
                return value < other.value;
            }
        };

        int main() {
            std::set mySet;

            // Using insert (might involve copy)
            mySet.insert(MyStruct(1));

            // Using emplace (constructs in place)
            mySet.emplace(2);

            for (const auto& elem : mySet) {
                std::cout << elem.value << std::endl;
            }

            return 0;
        }

std::set emplace insert C++ performance coding unique elements STL

How do I use emplace vs push with std::set?

Using Emplace vs Insert with std::set

Example of using emplace vs insert

Popular Topics

Recent Languages

How do I use emplace vs push with std::set?

Using Emplace vs Insert with std::set

Example of using emplace vs insert

Related Questions

Popular Topics

Recent Languages