LeechCraft  0.6.70-10870-g558588d6ec
Modular cross-platform feature rich live environment.
functional.h
Go to the documentation of this file.
1 /**********************************************************************
2  * LeechCraft - modular cross-platform feature rich internet client.
3  * Copyright (C) 2006-2014 Georg Rudoy
4  *
5  * Boost Software License - Version 1.0 - August 17th, 2003
6  *
7  * Permission is hereby granted, free of charge, to any person or organization
8  * obtaining a copy of the software and accompanying documentation covered by
9  * this license (the "Software") to use, reproduce, display, distribute,
10  * execute, and transmit the Software, and to prepare derivative works of the
11  * Software, and to permit third-parties to whom the Software is furnished to
12  * do so, all subject to the following:
13  *
14  * The copyright notices in the Software and this entire statement, including
15  * the above license grant, this restriction and the following disclaimer,
16  * must be included in all copies of the Software, in whole or in part, and
17  * all derivative works of the Software, unless such copies or derivative
18  * works are solely in the form of machine-executable object code generated by
19  * a source language processor.
20  *
21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23  * FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
24  * SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
25  * FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
26  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
27  * DEALINGS IN THE SOFTWARE.
28  **********************************************************************/
29 
30 #pragma once
31 
32 #include <type_traits>
33 
34 namespace LeechCraft
35 {
36 namespace Util
37 {
50  template<typename R, typename B, typename C, typename... Args>
51  auto BindMemFn (R (B::*fn) (Args...), C *c)
52  {
53  static_assert (std::is_base_of<B, C> {}, "Base class where the member pointer belongs must be convertible to the binded object's class.");
54  return [fn, c] (Args... args) { return (c->*fn) (args...); };
55  }
56 
57  template<typename R, typename B, typename C, typename... Args>
58  auto BindMemFn (R (B::*fn) (Args...) const, const C *c)
59  {
60  static_assert (std::is_base_of<B, C> {}, "Base class where the member pointer belongs must be convertible to the binded object's class.");
61  return [fn, c] (Args... args) { return (c->*fn) (args...); };
62  }
63 
64  template<typename To>
65  struct Caster
66  {
67  template<typename From>
68  std::enable_if_t<!std::is_base_of<To, std::decay_t<From>>::value, To> operator() (From&& from) const
69  {
70  return To { std::forward<From> (from) };
71  }
72 
73  template<typename From>
74  std::enable_if_t<std::is_base_of<To, std::decay_t<From>>::value, To> operator() (From&& from) const
75  {
76  return from;
77  }
78  };
79 
80  template<typename To>
81  struct Upcaster;
82 
83  template<typename To>
84  struct Upcaster<To*>
85  {
86  template<typename From, typename = std::enable_if_t<std::is_base_of_v<To, std::decay_t<From>>>>
87  To* operator() (From *from) const
88  {
89  return from;
90  }
91  };
92 
93  template<typename To>
94  constexpr auto Upcast = Upcaster<To> {};
95 }
96 }
constexpr auto Upcast
Definition: functional.h:94
auto BindMemFn(R(B::*fn)(Args...), C *c)
Binds an instance of an object to its member function.
Definition: functional.h:51
std::enable_if_t<!std::is_base_of< To, std::decay_t< From > >::value, To > operator()(From &&from) const
Definition: functional.h:68