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on.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 #ifndef RANGES_V3_FUNCTIONAL_ON_HPP
14 #define RANGES_V3_FUNCTIONAL_ON_HPP
15 
16 #include <concepts/concepts.hpp>
17 
18 #include <range/v3/detail/config.hpp>
20 
21 #include <range/v3/detail/prologue.hpp>
22 
23 namespace ranges
24 {
27  template<typename Fn1, typename Fn2>
28  struct transformed
29  {
30  private:
31  RANGES_NO_UNIQUE_ADDRESS
32  Fn1 first_;
33  RANGES_NO_UNIQUE_ADDRESS
34  Fn2 second_;
35 
36  public:
37  transformed() = default;
38  constexpr transformed(Fn1 fn1, Fn2 fn2)
39  : first_(static_cast<Fn1 &&>(fn1))
40  , second_(static_cast<Fn2 &&>(fn2))
41  {}
42  // clang-format off
43  template<typename... Args>
44  auto CPP_auto_fun(operator())(Args &&... args)
45  (
46  return invoke(first_, invoke(second_, static_cast<Args &&>(args)...))
47  )
48  template<typename... Args>
49  auto CPP_auto_fun(operator())(Args &&... args)(const)
50  (
51  return invoke((Fn1 const &)first_,
52  invoke((Fn2 const &)second_, static_cast<Args &&>(args))...)
53  )
54  // clang-format on
55  };
56 
57  struct on_fn
58  {
59  template<typename Fn1, typename Fn2>
60  constexpr transformed<Fn1, Fn2> operator()(Fn1 fn1, Fn2 fn2) const
61  {
62  return transformed<Fn1, Fn2>{detail::move(fn1), detail::move(fn2)};
63  }
64  };
65 
70 } // namespace ranges
71 
72 #include <range/v3/detail/epilogue.hpp>
73 
74 #endif
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
Definition: on.hpp:58
Definition: on.hpp:29