C++ Standard Template Library in Practice - Removing

The video tutorial explains the use of various remove functions in programming, such as remove, remove_if, remove_copy, and remove_copy_if. It highlights the differences between these functions, particularly focusing on how they handle elements based on predicates. The tutorial includes practical examples demonstrating the use of remove_if and remove_copy_if with a predicate to filter characters in a string. It concludes by summarizing the effects of these functions and introduces the next topic of sorting and gathering.

What is the primary purpose of the standard remove function?

• To shift elements and update the end iterator

• To copy elements to a new container

• To sort elements in a container

• To delete elements from a container

How does remove_copy_if differ from copy_if?

• remove_copy_if copies elements where the predicate is true

• remove_copy_if removes elements from the original container

• remove_copy_if sorts the elements

• remove_copy_if copies elements where the predicate is false

In the example, what is the role of the predicate 'invalid char'?

• To identify valid letters

• To copy the characters

• To identify invalid letters

• To sort the characters

What happens to the original string when remove_if is used?

• The elements are rearranged and some are missing

• The string remains unchanged

• The string is copied

• The string is sorted

Why is it necessary to use the erase method after remove_if?

• To sort the elements

• To remove the shifted elements

• To copy the elements

• To add new elements