A range adaptor that represents
view
of the elements from an underlying sequence, starting at the beginning and ending at the first element for which the predicate returns
false.
take_while_view models the concepts contiguous_range, random_access_range, bidirectional_range, forward_range, and input_range when the underlying view V models respective concepts.
V base_ (private) the underlying view
copyable-box<Pred>(until C++23)movable-box<Pred>(since C++23) pred_ (private) the underlying function object
take_while_view
sized_range or forward_range
std::ranges::view_interface<D>) [edit] returns a constant iterator to the beginning of the range
std::ranges::view_interface<D>) [edit] returns a sentinel for the constant iterator of the range
std::ranges::view_interface<D>) [edit] returns whether the derived view is not empty, provided only if ranges::empty is applicable to it
std::ranges::view_interface<D>) [edit] gets the address of derived view's data, provided only if its iterator type satisfies contiguous_iterator
std::ranges::view_interface<D>) [edit] returns the first element in the derived view, provided if it satisfies forward_range
std::ranges::view_interface<D>) [edit] returns the nth element in the derived view, provided only if it satisfies random_access_range
std::ranges::view_interface<D>) [edit] [edit] Deduction guides [edit] Nested classes the sentinel type
For forward_iterators, views::take_while(v, pred) is similar to ranges::subrange{ranges::begin(v), ranges::find_if_not(v, pred)}, but the latter invokes pred only during construction (while the former invokes pred each time a valid take_while iterator is compared to a sentinel).
#include <iostream>
#include <ranges>
int main()
{
for (int year : std::views::iota(2020)
| std::views::take_while([](int y){ return y < 2026; }))
std::cout << year << ' ';
std::cout << '\n';
const char note[]{"Today is yesterday's tomorrow!..."};
auto not_dot = [](char c){ return c != '.'; };
for (char x : std::ranges::take_while_view(note, not_dot))
std::cout << x;
std::cout << '\n';
}
Output:
2020 2021 2022 2023 2024 2025 Today is yesterday's tomorrow![edit] See also
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