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take_last.hpp
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1
2// Range v3 library
3//
4// Copyright Barry Revzin 2019-present
5//
6// Use, modification and distribution is subject to the
7// Boost Software License, Version 1.0. (See accompanying
8// file LICENSE_1_0.txt or copy at
9// http://www.boost.org/LICENSE_1_0.txt)
10//
11// Project home: https://github.com/ericniebler/range-v3
12//
13
14#ifndef RANGES_V3_VIEW_TAKE_LAST_HPP
15#define RANGES_V3_VIEW_TAKE_LAST_HPP
16
17#include <concepts/concepts.hpp>
18
20
25
26#include <range/v3/detail/prologue.hpp>
27
28namespace ranges
29{
32
33 namespace views
34 {
36 {
37 template(typename Rng)(
39 auto operator()(Rng && rng, range_difference_t<Rng> n) const
40 {
41 auto sz = ranges::distance(rng);
42 return drop_exactly(static_cast<Rng &&>(rng), sz > n ? sz - n : 0);
43 }
44 };
45
47 {
48 using take_last_base_fn::operator();
49
50 template(typename Int)(
51 requires detail::integer_like_<Int>)
52 constexpr auto operator()(Int n) const
53 {
54 return make_view_closure(bind_back(take_last_base_fn{}, n));
55 }
56 };
57
59 RANGES_INLINE_VARIABLE(take_last_fn, take_last)
60 } // namespace views
62} // namespace ranges
63
64#include <range/v3/detail/epilogue.hpp>
65
66#endif
The sized_range concept.
The viewable_range concept.
Definition take_last.hpp:36
Definition take_last.hpp:47