What\'s the Difference Between `std::remove` and `std::erase` in C ?

Understanding the Difference between Erase and Remove

The std::remove algorithm is designed to move non-deleted elements to the front of the container, overlapping deleted elements. This is due to its versatility in working with any forward iterator pair, including ones that cannot delete elements.

Distinguishing Erase and Remove

Erase removes the elements identified by std::remove. It reduces the size of the container by eliminating the deleted elements. In contrast, remove does not remove elements but instead shifts non-deleted elements forward to overwrite deleted ones.

Example with std::remove and a Vector

In the provided test code, the vector a contains two elements: 1 and 2. Applying std::remove on a removes all occurrences of 1 and shifts 2 to the beginning of the vector. However, the size of a remains 2 because the memory occupied by the deleted element is not released.

Example with std::remove and Erase

When std::remove and std::erase are used together, the deleted elements are removed, and the size of the container is adjusted to reflect the actual number of elements.

Conclusion

std::remove can be used independently to move non-deleted elements forward within a container. However, in most cases, it is used in conjunction with std::erase to remove the deleted elements and update the container's size.

The above is the detailed content of What\'s the Difference Between `std::remove` and `std::erase` in C ?. For more information, please follow other related articles on the PHP Chinese website!