Libosmium  2.15.4
Fast and flexible C++ library for working with OpenStreetMap data
function_wrapper.hpp
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1 #ifndef OSMIUM_THREAD_FUNCTION_WRAPPER_HPP
2 #define OSMIUM_THREAD_FUNCTION_WRAPPER_HPP
3 
4 /*
5 
6 This file is part of Osmium (https://osmcode.org/libosmium).
7 
8 Copyright 2013-2019 Jochen Topf <jochen@topf.org> and others (see README).
9 
10 Boost Software License - Version 1.0 - August 17th, 2003
11 
12 Permission is hereby granted, free of charge, to any person or organization
13 obtaining a copy of the software and accompanying documentation covered by
14 this license (the "Software") to use, reproduce, display, distribute,
15 execute, and transmit the Software, and to prepare derivative works of the
16 Software, and to permit third-parties to whom the Software is furnished to
17 do so, all subject to the following:
18 
19 The copyright notices in the Software and this entire statement, including
20 the above license grant, this restriction and the following disclaimer,
21 must be included in all copies of the Software, in whole or in part, and
22 all derivative works of the Software, unless such copies or derivative
23 works are solely in the form of machine-executable object code generated by
24 a source language processor.
25 
26 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
27 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
28 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
29 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
30 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
31 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
32 DEALINGS IN THE SOFTWARE.
33 
34 */
35 
36 #include <memory>
37 #include <utility>
38 
39 namespace osmium {
40 
41  namespace thread {
42 
49 
50  struct impl_base {
51 
52  impl_base() noexcept = default;
53 
54  impl_base(const impl_base&) noexcept = default;
55  impl_base& operator=(const impl_base&) noexcept = default;
56 
57  impl_base(impl_base&&) noexcept = default;
58  impl_base& operator=(impl_base&&) noexcept = default;
59 
60  virtual ~impl_base() noexcept = default;
61 
62  virtual bool call() {
63  return true;
64  }
65 
66  }; // struct impl_base
67 
68  std::unique_ptr<impl_base> impl;
69 
70  template <typename F>
71  struct impl_type : impl_base {
72 
74 
75  explicit impl_type(F&& functor) :
76  m_functor(std::forward<F>(functor)) {
77  }
78 
79  bool call() override {
80  m_functor();
81  return false;
82  }
83 
84  }; // struct impl_type
85 
86  public:
87 
88  // Constructor must not be "explicit" for wrapper
89  // to work seemlessly.
90  template <typename TFunction, typename X = typename std::enable_if<
91  !std::is_same<TFunction, function_wrapper>::value, void>::type>
92  // cppcheck-suppress noExplicitConstructor
93  function_wrapper(TFunction&& f) : // NOLINT(google-explicit-constructor, hicpp-explicit-conversions)
94  impl(new impl_type<TFunction>(std::forward<TFunction>(f))) {
95  }
96 
97  // The integer parameter is only used to signal that we want
98  // the special function wrapper that makes the worker thread
99  // shut down.
100  explicit function_wrapper(int /*dummy*/) :
101  impl(new impl_base()) {
102  }
103 
104  bool operator()() {
105  return impl->call();
106  }
107 
108  function_wrapper() = default;
109 
110  function_wrapper(const function_wrapper&) = delete;
111  function_wrapper& operator=(const function_wrapper&) = delete;
112 
113  function_wrapper(function_wrapper&& other) noexcept :
114  impl(std::move(other.impl)) {
115  }
116 
118  impl = std::move(other.impl);
119  return *this;
120  }
121 
122  ~function_wrapper() = default;
123 
124  explicit operator bool() const {
125  return static_cast<bool>(impl);
126  }
127 
128  }; // class function_wrapper
129 
130  } // namespace thread
131 
132 } // namespace osmium
133 
134 #endif // OSMIUM_THREAD_FUNCTION_WRAPPER_HPP
osmium::thread::function_wrapper::function_wrapper
function_wrapper()=default
osmium::thread::function_wrapper::impl_base
Definition: function_wrapper.hpp:50
osmium::thread::function_wrapper::function_wrapper
function_wrapper(function_wrapper &&other) noexcept
Definition: function_wrapper.hpp:113
osmium::thread::function_wrapper
Definition: function_wrapper.hpp:48
osmium::thread::function_wrapper::operator=
function_wrapper & operator=(const function_wrapper &)=delete
osmium::thread::function_wrapper::function_wrapper
function_wrapper(int)
Definition: function_wrapper.hpp:100
osmium::thread::function_wrapper::impl_base::operator=
impl_base & operator=(const impl_base &) noexcept=default
osmium::thread::function_wrapper::impl_type::call
bool call() override
Definition: function_wrapper.hpp:79
osmium::thread::function_wrapper::impl
std::unique_ptr< impl_base > impl
Definition: function_wrapper.hpp:68
osmium::thread::function_wrapper::operator=
function_wrapper & operator=(function_wrapper &&other) noexcept
Definition: function_wrapper.hpp:117
osmium::thread::function_wrapper::function_wrapper
function_wrapper(TFunction &&f)
Definition: function_wrapper.hpp:93
osmium::thread::function_wrapper::impl_type::m_functor
F m_functor
Definition: function_wrapper.hpp:73
osmium
Namespace for everything in the Osmium library.
Definition: assembler.hpp:53
osmium::thread::function_wrapper::impl_type
Definition: function_wrapper.hpp:71
osmium::thread::function_wrapper::~function_wrapper
~function_wrapper()=default
osmium::thread::function_wrapper::impl_base::~impl_base
virtual ~impl_base() noexcept=default
osmium::thread::function_wrapper::impl_base::impl_base
impl_base() noexcept=default
osmium::thread::function_wrapper::impl_base::call
virtual bool call()
Definition: function_wrapper.hpp:62
osmium::thread::function_wrapper::operator()
bool operator()()
Definition: function_wrapper.hpp:104
std
Definition: location.hpp:550
osmium::thread::function_wrapper::impl_type::impl_type
impl_type(F &&functor)
Definition: function_wrapper.hpp:75
osmium::osm_entity_bits::type
type
Definition: entity_bits.hpp:63