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min_element.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_MIN_ELEMENT_HPP
14 #define RANGES_V3_ALGORITHM_MIN_ELEMENT_HPP
15 
16 #include <range/v3/range_fwd.hpp>
17 
28 #include <range/v3/utility/static_const.hpp>
29 
30 #include <range/v3/detail/prologue.hpp>
31 
32 namespace ranges
33 {
36  RANGES_FUNC_BEGIN(min_element)
37 
38 
39  template(typename I, typename S, typename C = less, typename P = identity)(
40  requires forward_iterator<I> AND sentinel_for<S, I> AND
41  indirect_strict_weak_order<C, projected<I, P>>)
42  constexpr I RANGES_FUNC(min_element)(I first, S last, C pred = C{}, P proj = P{})
43  {
44  if(first != last)
45  for(auto tmp = next(first); tmp != last; ++tmp)
46  if(invoke(pred, invoke(proj, *tmp), invoke(proj, *first)))
47  first = tmp;
48  return first;
49  }
50 
52  template(typename Rng, typename C = less, typename P = identity)(
53  requires forward_range<Rng> AND
54  indirect_strict_weak_order<C, projected<iterator_t<Rng>, P>>)
55  constexpr borrowed_iterator_t<Rng> //
56  RANGES_FUNC(min_element)(Rng && rng, C pred = C{}, P proj = P{}) //
57  {
58  return (*this)(begin(rng), end(rng), std::move(pred), std::move(proj));
59  }
60 
61  RANGES_FUNC_END(min_element)
62 
63  namespace cpp20
64  {
65  using ranges::min_element;
66  }
68 } // namespace ranges
69 
70 #include <range/v3/detail/epilogue.hpp>
71 
72 #endif
CPP_concept indirect_strict_weak_order
\concept indirect_strict_weak_order
Definition: concepts.hpp:689
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
bool_<(T::type::value< U::type::value)> less
A Boolean integral constant wrapper around true if T::type::value is less than U::type::value; false,...
Definition: meta.hpp:255