mirror of
https://github.com/ecency/ecency-mobile.git
synced 2024-12-23 05:13:04 +03:00
78 lines
1.9 KiB
C
78 lines
1.9 KiB
C
/*
|
|
* Copyright 2016 Facebook, Inc.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
/**
|
|
* GCC compatible wrappers around clang attributes.
|
|
*
|
|
* @author Dominik Gabi
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#ifndef __has_cpp_attribute
|
|
#define FOLLY_HAS_CPP_ATTRIBUTE(x) 0
|
|
#else
|
|
#define FOLLY_HAS_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
|
|
#endif
|
|
|
|
#ifndef __has_extension
|
|
#define FOLLY_HAS_EXTENSION(x) 0
|
|
#else
|
|
#define FOLLY_HAS_EXTENSION(x) __has_extension(x)
|
|
#endif
|
|
|
|
/**
|
|
* Fallthrough to indicate that `break` was left out on purpose in a switch
|
|
* statement, e.g.
|
|
*
|
|
* switch (n) {
|
|
* case 22:
|
|
* case 33: // no warning: no statements between case labels
|
|
* f();
|
|
* case 44: // warning: unannotated fall-through
|
|
* g();
|
|
* FOLLY_FALLTHROUGH; // no warning: annotated fall-through
|
|
* }
|
|
*/
|
|
#if FOLLY_HAS_CPP_ATTRIBUTE(clang::fallthrough)
|
|
#define FOLLY_FALLTHROUGH [[clang::fallthrough]]
|
|
#else
|
|
#define FOLLY_FALLTHROUGH
|
|
#endif
|
|
|
|
/**
|
|
* Nullable indicates that a return value or a parameter may be a `nullptr`,
|
|
* e.g.
|
|
*
|
|
* int* FOLLY_NULLABLE foo(int* a, int* FOLLY_NULLABLE b) {
|
|
* if (*a > 0) { // safe dereference
|
|
* return nullptr;
|
|
* }
|
|
* if (*b < 0) { // unsafe dereference
|
|
* return *a;
|
|
* }
|
|
* if (b != nullptr && *b == 1) { // safe checked dereference
|
|
* return new int(1);
|
|
* }
|
|
* return nullptr;
|
|
* }
|
|
*/
|
|
#if FOLLY_HAS_EXTENSION(nullability)
|
|
#define FOLLY_NULLABLE _Nullable
|
|
#else
|
|
#define FOLLY_NULLABLE
|
|
#endif
|