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Base.h
1 /*----------------------------------------------------------------------------*/
2 /* Copyright (c) FIRST 2008-2016. All Rights Reserved. */
3 /* Open Source Software - may be modified and shared by FRC teams. The code */
4 /* must be accompanied by the FIRST BSD license file in the root directory of */
5 /* the project. */
6 /*----------------------------------------------------------------------------*/
7 
8 #pragma once
9 
10 #include "HAL/cpp/make_unique.h"
11 
12 // MSVC 2013 doesn't allow "= default" on move constructors, but since we are
13 // (currently) only actually using the move constructors in non-MSVC situations
14 // (ie, wpilibC++Devices), we can just ignore it in MSVC.
15 #if !defined(_MSC_VER)
16 #define DEFAULT_MOVE_CONSTRUCTOR(ClassName) ClassName(ClassName&&) = default
17 #else
18 #define DEFAULT_MOVE_CONSTRUCTOR(ClassName)
19 #endif
20 
21 #if (__cplusplus < 201103L)
22 #if !defined(_MSC_VER)
23 #define nullptr NULL
24 #endif
25 #define constexpr const
26 #endif
27 
28 #if defined(_MSC_VER)
29 #define noexcept throw()
30 #endif
31 
32 // Provide std::decay_t when using GCC < 4.9
33 #if defined(__GNUC__)
34 #if __GNUC__ == 4 && __GNUC_MINOR__ < 9
35 #include <type_traits>
36 namespace std {
37 template <class T>
38 using decay_t = typename decay<T>::type;
39 }
40 #endif
41 #endif
42 
43 namespace frc {
44 
45 // A struct to use as a deleter when a std::shared_ptr must wrap a raw pointer
46 // that is being deleted by someone else.
47 template <class T>
48 struct NullDeleter {
49  void operator()(T*) const noexcept {};
50 };
51 
52 } // namespace frc
53 
54 #include <atomic>
55 
56 namespace frc {
57 
58 // Use this for determining whether the default move constructor has been
59 // called on a containing object. This serves the purpose of allowing us to
60 // use the default move constructor of an object for moving all the data around
61 // while being able to use this to, for instance, chose not to de-allocate
62 // a PWM port in a destructor.
63 struct HasBeenMoved {
64  HasBeenMoved(HasBeenMoved&& other) {
65  other.moved = true;
66  moved = false;
67  }
68  HasBeenMoved() = default;
69  std::atomic<bool> moved{false};
70  operator bool() const { return moved; }
71 };
72 
73 } // namespace frc
74 
75 // For backwards compatibility
76 #ifndef NAMESPACED_WPILIB
77 using namespace frc; // NOLINT
78 #endif
Definition: Base.h:48
Definition: Base.h:63