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identity.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_IDENTITY_HPP
14 #define RANGES_V3_FUNCTIONAL_IDENTITY_HPP
15 
16 #include <range/v3/detail/config.hpp>
17 
18 #include <range/v3/detail/prologue.hpp>
19 
20 namespace ranges
21 {
24  struct identity
25  {
26  template<typename T>
27  constexpr T && operator()(T && t) const noexcept
28  {
29  return (T &&) t;
30  }
31  using is_transparent = void;
32  };
33 
35  using ident RANGES_DEPRECATED("Replace uses of ranges::ident with ranges::identity") =
36  identity;
38 
39  namespace cpp20
40  {
41  using ranges::identity;
42  }
44 } // namespace ranges
45 
46 #include <range/v3/detail/epilogue.hpp>
47 
48 #endif
Definition: identity.hpp:25