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std::ranges::drop_view::drop_view(3) | C++ Standard Libary | std::ranges::drop_view::drop_view(3) |
NAME¶
std::ranges::drop_view::drop_view - std::ranges::drop_view::drop_view
Synopsis¶
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¶
// Run this code
#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
2022.07.31 | http://cppreference.com |