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Drop_while

As explained in Learn C++ by Example

drop_while is a range adaptor that skips an initial sequence of elements while a predicate is true.

drop_while creates a range view that skips an initial run of elements while a predicate remains true. For a vector containing 0 through 5, dropping values less than 3 produces 3, 4, 5 without modifying the container or tracking iterator endpoints. section 2.3.4

Skip the opening values

for (int n : v | std::views::drop_while([](int i) { return i < 3; })) { std::cout << n << ' '; } The pipe form keeps composed views readable and prints 3 4 5. section 2.3.4

How Learn C++ by Example covers it

How deep it goes
Defines the behavior, demonstrates direct and piped syntax, and contrasts it with repeated iterator-based filtering.
Examples
Uses a vector containing 0 through 5 and a predicate that drops values less than 3.
What you can do after
Apply it via std::views::drop_while or a pipe to produce readable filtered range views.
How it connects
Connects range views with containers, iterators, predicates, filter, and the pipe operator.
Cover of Learn C++ by Example
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