std::ranges::common_view<V>::size
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< cpp | ranges | common view
C++
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std::ranges::common_view
| Member functions | ||||
common_view::size | ||||
| Deduction guides |
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constexpr
auto size(
) requires ranges::sized_range
<V>
;
|
(1) | (since C++20) |
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constexpr
auto size(
)
const requires ranges::sized_range
<
const V>
;
|
(2) | (since C++20) |
Returns the number of elements.
Equivalent to
return
ranges::size
(base_)
;
, where base_
Parameters
(none)
Return value
The number of elements.
Example
Run this code
#include <ranges> #include <string_view> int main() { constexpr static auto v1 = {1, 2, 3, 4, 5}; constexpr auto common1 { v1 | std::views::common }; static_assert(common1.size() == 5); constexpr auto take3 { v1 | std::views::reverse | std::views::take(3) }; constexpr auto common2 { take3 | std::views::common }; static_assert(common2.size() == 3); using namespace std::literals; constexpr static auto v2 = { "∧"sv, "∨"sv, "∃"sv, "∀"sv }; static_assert(std::ranges::views::common(v2).size() == 4); }
See also
|
(C++20)
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returns an integer equal to the size of a range (customization point object) |
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(C++20)
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returns a signed integer equal to the size of a range (customization point object) |