std::ranges::drop_view<V>::drop_view
drop_view() requires std::default_initializable<V> = default; |
(1) | (since C++20) |
constexpr drop_view( V base, ranges::range_difference_t<V> count ); |
(2) | (since C++20) |
Constructs a drop_view.
1) Default constructor.
Value-initializes the underlying view and initializes the count to
0. After construction,
base() returns a copy of
V() and
size() equals to the size of the underlying view.
2) Initializes the underlying view with
std::move(base) and the count with
count. After construction,
base() returns a copy of
base and
size() returns
ranges::size(base) - count if the size of
base is not less than
count, or
0 otherwise.
Parameters
| base | - | the underlying view |
| count | - | number of elements to skip. |
Example
#include <algorithm>
#include <array>
#include <iostream>
#include <iterator>
#include <ranges>
int main()
{
constexpr std::array hi{ 'H','e','l','l','o',',',' ','C','+','+','2','0' };
std::ranges::for_each(hi, [](const char c){ std::cout << c; });
std::cout << '\n';
constexpr auto n = std::distance(hi.cbegin(), std::ranges::find(hi, 'C'));
auto cxx = std::ranges::drop_view{ hi, n };
std::ranges::for_each(cxx, [](const char c){ std::cout << c; });
std::cout << '\n';
}
Output:
Hello, C++20 C++20
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