Checking conditions
The elegance of the C++ STL doesn’t just lie in its vast assortment of containers and algorithms. It also resides in its fine-tuned ability to let developers efficiently check and validate data using condition-based operations. With the might of predicate functions, these operations empower programmers to answer questions such as Does this dataset hold a particular property? and Are all elements in this range positive?
One of the most intuitive and fundamental operations is std::all_of. With this algorithm, you can check if all elements in a range satisfy a given predicate. If you had a list of students’ grades, you could use std::all_of to see if all grades were positive (and they should be!).
By contrast, its counterpart std::none_of checks if none of the elements in a range satisfy a given predicate. Let’s say you’re working with a list of student grades and want to ensure that no one has scored below passing marks. In this...
