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transform.hpp
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1 // Range v3 library
3 //
4 // Copyright Eric Niebler 2013-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_ACTION_TRANSFORM_HPP
15 #define RANGES_V3_ACTION_TRANSFORM_HPP
16 
17 #include <range/v3/range_fwd.hpp>
18 
25 #include <range/v3/utility/static_const.hpp>
26 
27 #include <range/v3/detail/prologue.hpp>
28 
29 namespace ranges
30 {
33  namespace actions
34  {
35  struct transform_fn
36  {
37  template(typename F, typename P = identity)(
38  requires (!range<F>))
39  constexpr auto operator()(F fun, P proj = P{}) const
40  {
41  return make_action_closure(
42  bind_back(transform_fn{}, std::move(fun), std::move(proj)));
43  }
44 
45  template(typename Rng, typename F, typename P = identity)(
46  requires input_range<Rng> AND copy_constructible<F> AND
49  indirect_result_t<F &, projected<iterator_t<Rng>, P>>>)
50  Rng operator()(Rng && rng, F fun, P proj = P{}) const
51  {
52  ranges::transform(rng, begin(rng), std::move(fun), std::move(proj));
53  return static_cast<Rng &&>(rng);
54  }
55  };
56 
59  } // namespace actions
61 } // namespace ranges
62 
63 #include <range/v3/detail/epilogue.hpp>
64 
65 #endif
CPP_concept indirectly_writable
\concept indirectly_writable
Definition: concepts.hpp:169
decltype(begin(declval(Rng &))) iterator_t
Definition: access.hpp:698
RANGES_INLINE_VARIABLE(detail::to_container_fn< detail::from_range< std::vector >>, to_vector) template< template< typename... > class ContT > auto to(RANGES_HIDDEN_DETAIL(detail
For initializing a container of the specified type with the elements of an Range.
Definition: conversion.hpp:399
defer< bind_back, Fn, Ts... > bind_back
Definition: meta.hpp:994
Definition: transform.hpp:36
Definition: identity.hpp:25