1/*
2 * Copyright (C) 2017 Yusuke Suzuki <utatane.tea@gmail.com>. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include <type_traits>
29
30namespace WTF {
31
32template<typename Functor>
33class RecursableLambda {
34 WTF_MAKE_FAST_ALLOCATED;
35public:
36 explicit RecursableLambda(Functor&& functor)
37 : m_functor(std::forward<Functor>(functor))
38 {
39 }
40
41 template<typename... Args>
42 decltype(auto) operator()(Args&&... args) const
43 {
44 return m_functor(std::ref(*this), std::forward<Args>(args)...);
45 }
46
47private:
48 Functor m_functor;
49};
50
51template<typename Functor>
52decltype(auto) recursableLambda(Functor&& f)
53{
54 return RecursableLambda<std::decay_t<Functor>>(std::forward<Functor>(f));
55}
56
57} // namespace WTF
58
59using WTF::recursableLambda;
60