gecko-dev/dom/bindings/Nullable.h
Emilio Cobos Álvarez 256c124f94 Bug 1609996 - Reorder some includes affected by the previous patches. r=froydnj
This was done by:

This was done by applying:

```
diff --git a/python/mozbuild/mozbuild/code-analysis/mach_commands.py b/python/mozbuild/mozbuild/code-analysis/mach_commands.py
index 789affde7bbf..fe33c4c7d4d1 100644
--- a/python/mozbuild/mozbuild/code-analysis/mach_commands.py
+++ b/python/mozbuild/mozbuild/code-analysis/mach_commands.py
@@ -2007,7 +2007,7 @@ class StaticAnalysis(MachCommandBase):
         from subprocess import Popen, PIPE, check_output, CalledProcessError

         diff_process = Popen(self._get_clang_format_diff_command(commit), stdout=PIPE)
-        args = [sys.executable, clang_format_diff, "-p1", "-binary=%s" % clang_format]
+        args = [sys.executable, clang_format_diff, "-p1", "-binary=%s" % clang_format, '-sort-includes']

         if not output_file:
             args.append("-i")
```

Then running `./mach clang-format -c <commit-hash>`

Then undoing that patch.

Then running check_spidermonkey_style.py --fixup

Then running `./mach clang-format`

I had to fix four things:

 * I needed to move <utility> back down in GuardObjects.h because I was hitting
   obscure problems with our system include wrappers like this:

0:03.94 /usr/include/stdlib.h:550:14: error: exception specification in declaration does not match previous declaration
0:03.94 extern void *realloc (void *__ptr, size_t __size)
0:03.94              ^
0:03.94 /home/emilio/src/moz/gecko-2/obj-debug/dist/include/malloc_decls.h:53:1: note: previous declaration is here
0:03.94 MALLOC_DECL(realloc, void*, void*, size_t)
0:03.94 ^
0:03.94 /home/emilio/src/moz/gecko-2/obj-debug/dist/include/mozilla/mozalloc.h:22:32: note: expanded from macro 'MALLOC_DECL'
0:03.94     MOZ_MEMORY_API return_type name##_impl(__VA_ARGS__);
0:03.94                                ^
0:03.94 <scratch space>:178:1: note: expanded from here
0:03.94 realloc_impl
0:03.94 ^
0:03.94 /home/emilio/src/moz/gecko-2/obj-debug/dist/include/mozmemory_wrap.h:142:41: note: expanded from macro 'realloc_impl'
0:03.94 #define realloc_impl mozmem_malloc_impl(realloc)

   Which I really didn't feel like digging into.

 * I had to restore the order of TrustOverrideUtils.h and related files in nss
   because the .inc files depend on TrustOverrideUtils.h being included earlier.

 * I had to add a missing include to RollingNumber.h

 * Also had to partially restore include order in JsepSessionImpl.cpp to avoid
   some -WError issues due to some static inline functions being defined in a
   header but not used in the rest of the compilation unit.

Differential Revision: https://phabricator.services.mozilla.com/D60327

--HG--
extra : moz-landing-system : lando
2020-01-20 16:19:48 +00:00

111 lines
2.9 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef mozilla_dom_Nullable_h
#define mozilla_dom_Nullable_h
#include <ostream>
#include <utility>
#include "mozilla/Assertions.h"
#include "mozilla/Maybe.h"
#include "nsTArrayForwardDeclare.h"
class nsCycleCollectionTraversalCallback;
namespace mozilla {
namespace dom {
// Support for nullable types
template <typename T>
struct Nullable {
private:
Maybe<T> mValue;
public:
Nullable() : mValue() {}
MOZ_IMPLICIT Nullable(const decltype(nullptr)&) : mValue() {}
explicit Nullable(const T& aValue) : mValue() { mValue.emplace(aValue); }
MOZ_IMPLICIT Nullable(T&& aValue) : mValue() {
mValue.emplace(std::move(aValue));
}
Nullable(Nullable<T>&& aOther) : mValue(std::move(aOther.mValue)) {}
Nullable(const Nullable<T>& aOther) : mValue(aOther.mValue) {}
void operator=(const Nullable<T>& aOther) { mValue = aOther.mValue; }
void SetValue(const T& aArgs) {
mValue.reset();
mValue.emplace(aArgs);
}
void SetValue(T&& aArgs) {
mValue.reset();
mValue.emplace(std::move(aArgs));
}
// For cases when |T| is some type with nontrivial copy behavior, we may want
// to get a reference to our internal copy of T and work with it directly
// instead of relying on the copying version of SetValue().
T& SetValue() {
if (mValue.isNothing()) {
mValue.emplace();
}
return mValue.ref();
}
void SetNull() { mValue.reset(); }
const T& Value() const { return mValue.ref(); }
T& Value() { return mValue.ref(); }
bool IsNull() const { return mValue.isNothing(); }
bool Equals(const Nullable<T>& aOtherNullable) const {
return mValue == aOtherNullable.mValue;
}
bool operator==(const Nullable<T>& aOtherNullable) const {
return Equals(aOtherNullable);
}
bool operator!=(const Nullable<T>& aOtherNullable) const {
return !Equals(aOtherNullable);
}
friend std::ostream& operator<<(std::ostream& aStream,
const Nullable& aNullable) {
return aStream << aNullable.mValue;
}
};
template <typename T>
void ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
Nullable<T>& aNullable, const char* aName,
uint32_t aFlags = 0) {
if (!aNullable.IsNull()) {
ImplCycleCollectionTraverse(aCallback, aNullable.Value(), aName, aFlags);
}
}
template <typename T>
void ImplCycleCollectionUnlink(Nullable<T>& aNullable) {
if (!aNullable.IsNull()) {
ImplCycleCollectionUnlink(aNullable.Value());
}
}
} // namespace dom
} // namespace mozilla
#endif /* mozilla_dom_Nullable_h */