std::ranges::drop_view<V>:: drop_view

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C++
Ranges library
Range adaptors
std::ranges::drop_view
drop_view ( ) requires std:: default_initializable < V > = default ;
(1) (since C++20)
constexpr explicit 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 base_ and initializes the count 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 base_ with std :: move ( base ) and the count 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

Defect 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
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