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https://github.com/wpilibsuite/allwpilib
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f64b055499
The [[deprecated]] attribute is a C++14 feature not supported by MSVC or GCC < 4.9, but can be simulated on both of these compilers through the use of alternative (compiler-specific) attribute methods. Change-Id: I34aed5705db2407c592f7cabd5274358c48d34fe
71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
/*----------------------------------------------------------------------------*/
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/* Copyright (c) FIRST 2008. All Rights Reserved. */
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/* Open Source Software - may be modified and shared by FRC teams. The code */
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/* must be accompanied by the FIRST BSD license file in $(WIND_BASE)/WPILib. */
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/*----------------------------------------------------------------------------*/
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#pragma once
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// MSVC 2013 doesn't allow "= default" on move constructors, but since we are
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// (currently) only actually using the move constructors in non-MSVC situations
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// (ie, wpilibC++Devices), we can just ignore it in MSVC.
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#if !defined(_MSC_VER)
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#define DEFAULT_MOVE_CONSTRUCTOR(ClassName) \
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ClassName(ClassName &&) = default
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#else
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#define DEFAULT_MOVE_CONSTRUCTOR(ClassName)
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#endif
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#if (__cplusplus < 201103L)
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#if !defined(_MSC_VER)
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#define nullptr NULL
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#endif
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#define constexpr const
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#endif
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#if defined(_MSC_VER)
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#define noexcept throw()
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#endif
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// [[deprecated(msg)]] is a C++14 feature not supported by MSVC or GCC < 4.9.
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// We provide an equivalent warning implementation for those compilers here.
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#if defined(_MSC_VER)
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#define DEPRECATED(msg) __declspec(deprecated(msg))
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#elif defined(__GNUC__)
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#if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ > 8)
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#define DEPRECATED(msg) [[deprecated(msg)]]
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#else
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#define DEPRECATED(msg) __attribute__((deprecated(msg)))
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#endif
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#elif __cplusplus > 201103L
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#define DEPRECATED(msg) [[deprecated(msg)]]
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#else
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#define DEPRECATED(msg) /*nothing*/
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#endif
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// A struct to use as a deleter when a std::shared_ptr must wrap a raw pointer
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// that is being deleted by someone else.
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// This should only be called in deprecated functions; using it anywhere else
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// will throw warnings.
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template<class T>
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struct
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DEPRECATED("wrapping raw pointer in std::shared_ptr")
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NullDeleter {
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void operator()(T *) const noexcept {};
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};
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#include <atomic>
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// Use this for determining whether the default move constructor has been
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// called on a containing object. This serves the purpose of allowing us to
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// use the default move constructor of an object for moving all the data around
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// while being able to use this to, for instance, chose not to de-allocate
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// a PWM port in a destructor.
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struct HasBeenMoved {
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HasBeenMoved(HasBeenMoved&& other) {
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other.moved = true;
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moved = false;
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}
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HasBeenMoved() = default;
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std::atomic<bool> moved{false};
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operator bool() const { return moved; }
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};
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