std::ranges::drop_view<V>::drop_view
|
(1) | (since C++20) |
|
(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++20Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 3714 (P2711R1) |
C++20 | the multi-parameter constructor was not explicit | made explicit |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/cpp/ranges/drop_view/drop_view