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remove_if.hpp
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1 // Range v3 library
3 //
4 // Copyright Eric Niebler 2014-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 #ifndef RANGES_V3_ALGORITHM_REMOVE_IF_HPP
14 #define RANGES_V3_ALGORITHM_REMOVE_IF_HPP
15 
16 #include <meta/meta.hpp>
17 
18 #include <range/v3/range_fwd.hpp>
19 
30 #include <range/v3/utility/static_const.hpp>
31 
32 #include <range/v3/detail/prologue.hpp>
33 
34 namespace ranges
35 {
38  RANGES_FUNC_BEGIN(remove_if)
39 
40 
41  template(typename I, typename S, typename C, typename P = identity)(
42  requires permutable<I> AND sentinel_for<S, I> AND
43  indirect_unary_predicate<C, projected<I, P>>)
44  constexpr I RANGES_FUNC(remove_if)(I first, S last, C pred, P proj = P{})
45  {
46  first = find_if(std::move(first), last, ranges::ref(pred), ranges::ref(proj));
47  if(first != last)
48  {
49  for(I i = next(first); i != last; ++i)
50  {
51  if(!(invoke(pred, invoke(proj, *i))))
52  {
53  *first = iter_move(i);
54  ++first;
55  }
56  }
57  }
58  return first;
59  }
60 
62  template(typename Rng, typename C, typename P = identity)(
63  requires forward_range<Rng> AND permutable<iterator_t<Rng>> AND
64  indirect_unary_predicate<C, projected<iterator_t<Rng>, P>>)
65  constexpr borrowed_iterator_t<Rng> RANGES_FUNC(remove_if)(Rng && rng, C pred, P proj = P{})
66  {
67  return (*this)(begin(rng), end(rng), std::move(pred), std::move(proj));
68  }
69 
70  RANGES_FUNC_END(remove_if)
71 
72  namespace cpp20
73  {
74  using ranges::remove_if;
75  }
77 } // namespace ranges
78 
79 #include <range/v3/detail/epilogue.hpp>
80 
81 #endif
CPP_concept permutable
\concept permutable
Definition: concepts.hpp:840
CPP_concept indirect_unary_predicate
\concept indirect_unary_predicate
Definition: concepts.hpp:632
typename Fn::template invoke< Args... > invoke
Evaluate the invocable Fn with the arguments Args.
Definition: meta.hpp:541
front< Pair > first
Retrieve the first element of the pair Pair.
Definition: meta.hpp:2251
_t< detail::find_if_< L, Fn > > find_if
Return the tail of the list L starting at the first element A such that invoke<Fn,...
Definition: meta.hpp:2506
Tiny meta-programming library.