本文整理汇总了C++中OutputBuffer::Get方法的典型用法代码示例。如果您正苦于以下问题：C++ OutputBuffer::Get方法的具体用法？C++ OutputBuffer::Get怎么用？C++ OutputBuffer::Get使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类OutputBuffer的用法示例。
在下文中一共展示了OutputBuffer::Get方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: Ok
Result<Ok, nsresult>
WritableSharedMap::Serialize()
{
// Serializes a new snapshot of the map, initializes a new read-only shared
// memory region with its contents, and updates all entries to point to that
// new snapshot.
//
// The layout of the snapshot is as follows:
//
// - A header containing a uint32 count field containing the number of
// entries in the map, followed by that number of serialized entry headers,
// as produced by Entry::Code.
//
// - A data block containing structured clone data for each of the entries'
// values. This data is referenced by absolute byte offsets from the start
// of the shared memory region, encoded in each of the entry header values.
// Each entry's data is aligned to kStructuredCloneAlign, and therefore may
// have alignment padding before it.
//
// This serialization format is decoded by the MaybeRebuild() method of
// read-only SharedMap() instances, and used to populate their mEntries
// hashtables.
//
// Writable instances never read the header blocks, but instead directly
// update their Entry instances to point to the appropriate offsets in the
// shared memory region created by this function.
uint32_t count = mEntries.Count();
size_t dataSize = 0;
size_t headerSize = sizeof(count);
size_t blobCount = 0;
for (auto& entry : IterHash(mEntries)) {
headerSize += entry->HeaderSize();
blobCount += entry->BlobCount();
dataSize += entry->Size();
AlignTo(&dataSize, kStructuredCloneAlign);
}
size_t offset = headerSize;
AlignTo(&offset, kStructuredCloneAlign);
OutputBuffer header;
header.codeUint32(count);
MemMapSnapshot mem;
MOZ_TRY(mem.Init(offset + dataSize));
auto ptr = mem.Get<char>();
// We need to build the new array of blobs before we overwrite the existing
// one, since previously-serialized entries will store their blob references
// as indexes into our blobs array.
nsTArray<RefPtr<BlobImpl>> blobImpls(blobCount);
for (auto& entry : IterHash(mEntries)) {
AlignTo(&offset, kStructuredCloneAlign);
size_t blobOffset = blobImpls.Length();
if (entry->BlobCount()) {
blobImpls.AppendElements(entry->Blobs());
}
entry->ExtractData(&ptr[offset], offset, blobOffset);
entry->Code(header);
offset += entry->Size();
}
mBlobImpls = std::move(blobImpls);
// FIXME: We should create a separate OutputBuffer class which can encode to
// a static memory region rather than dynamically allocating and then
// copying.
MOZ_ASSERT(header.cursor() == headerSize);
memcpy(ptr.get(), header.Get(), header.cursor());
// We've already updated offsets at this point. We need this to succeed.
mMap.reset();
MOZ_RELEASE_ASSERT(mem.Finalize(mMap).isOk());
return Ok();
}