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662d7f11d5
* Structs with user-declared constructors are no longer considered aggregates, so remove the declarations when possible * Types of both arguments to "==" must match to avoid "ambiguous function call" warning * Various types of math involving enums are deprecated, so replace with constexprs where necessary * ABSL_CONST_INIT must be used on definition as well as declaration * volatile memory may no longer be read from and written to by the same operator, so replace e.g. "n++" with "n = n + 1" * Replace an outdated check for no_unique_address support with __has_cpp_attribute * std::result_of(f(x)) has been removed, replace with std::invoke_result(f, x) Bug: chromium:1284275 Change-Id: I77b366ab1da7eb2c1e4c825b2714417c31ee5903 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/261221 Auto-Submit: Peter Kasting <pkasting@chromium.org> Reviewed-by: Tomas Gunnarsson <tommi@google.com> Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#36786}
37 lines
1.6 KiB
C++
37 lines
1.6 KiB
C++
/*
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* Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_SYSTEM_NO_UNIQUE_ADDRESS_H_
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#define RTC_BASE_SYSTEM_NO_UNIQUE_ADDRESS_H_
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// RTC_NO_UNIQUE_ADDRESS is a portable annotation to tell the compiler that
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// a data member need not have an address distinct from all other non-static
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// data members of its class.
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// It allows empty types to actually occupy zero bytes as class members,
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// instead of occupying at least one byte just so that they get their own
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// address. There is almost never any reason not to use it on class members
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// that could possibly be empty.
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// The macro expands to [[no_unique_address]] if the compiler supports the
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// attribute, it expands to nothing otherwise.
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// Clang should supports this attribute since C++11, while other compilers
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// should add support for it starting from C++20. Among clang compilers,
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// clang-cl doesn't support it yet and support is unclear also when the target
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// platform is iOS.
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#ifndef __has_cpp_attribute
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#define __has_cpp_attribute(__x) 0
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#endif
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#if __has_cpp_attribute(no_unique_address)
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// NOLINTNEXTLINE(whitespace/braces)
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#define RTC_NO_UNIQUE_ADDRESS [[no_unique_address]]
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#else
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#define RTC_NO_UNIQUE_ADDRESS
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#endif
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#endif // RTC_BASE_SYSTEM_NO_UNIQUE_ADDRESS_H_
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