本文整理汇总了C++中Maybe::Capacity方法的典型用法代码示例。如果您正苦于以下问题：C++ Maybe::Capacity方法的具体用法？C++ Maybe::Capacity怎么用？C++ Maybe::Capacity使用的例子？那么, 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Maybe的用法示例。
在下文中一共展示了Maybe::Capacity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: HandleError
nsresult
SourceBuffer::Compact()
{
mMutex.AssertCurrentThreadOwns();
MOZ_ASSERT(mConsumerCount == 0, "Should have no consumers here");
MOZ_ASSERT(mWaitingConsumers.Length() == 0, "Shouldn't have waiters");
MOZ_ASSERT(mStatus, "Should be complete here");
// Compact our waiting consumers list, since we're complete and no future
// consumer will ever have to wait.
mWaitingConsumers.Compact();
// If we have no chunks, then there's nothing to compact.
if (mChunks.Length() < 1) {
return NS_OK;
}
// If we have one chunk, then we can compact if it has excess capacity.
if (mChunks.Length() == 1 && mChunks[0].Length() == mChunks[0].Capacity()) {
return NS_OK;
}
// We can compact our buffer. Determine the total length.
size_t length = 0;
for (uint32_t i = 0 ; i < mChunks.Length() ; ++i) {
length += mChunks[i].Length();
}
Maybe<Chunk> newChunk = CreateChunk(length, /* aRoundUp = */ false);
if (MOZ_UNLIKELY(!newChunk || newChunk->AllocationFailed())) {
NS_WARNING("Failed to allocate chunk for SourceBuffer compacting - OOM?");
return NS_OK;
}
// Copy our old chunks into the new chunk.
for (uint32_t i = 0 ; i < mChunks.Length() ; ++i) {
size_t offset = newChunk->Length();
MOZ_ASSERT(offset < newChunk->Capacity());
MOZ_ASSERT(offset + mChunks[i].Length() <= newChunk->Capacity());
memcpy(newChunk->Data() + offset, mChunks[i].Data(), mChunks[i].Length());
newChunk->AddLength(mChunks[i].Length());
}
MOZ_ASSERT(newChunk->Length() == newChunk->Capacity(),
"Compacted chunk has slack space");
// Replace the old chunks with the new, compact chunk.
mChunks.Clear();
if (MOZ_UNLIKELY(NS_FAILED(AppendChunk(Move(newChunk))))) {
return HandleError(NS_ERROR_OUT_OF_MEMORY);
}
mChunks.Compact();
return NS_OK;
}