Method Paste

libraries/lib-wave-track/Sequence.cpp:490–693

! @excsafety{Strong} */

/*! @excsafety{Strong} */
void Sequence::Paste(sampleCount s, const Sequence *src)
{
   if ((s < 0) || (s > mNumSamples))
   {
      wxLogError(
         wxT("Sequence::Paste: sampleCount s %s is < 0 or > mNumSamples %s)."),
         // PRL:  Why bother with Internat when the above is just wxT?
         Internat::ToString(s.as_double(), 0),
         Internat::ToString(mNumSamples.as_double(), 0));
      THROW_INCONSISTENCY_EXCEPTION;
   }

   // Quick check to make sure that it doesn't overflow
   if (Overflows((mNumSamples.as_double()) + (src->mNumSamples.as_double())))
   {
      wxLogError(
         wxT("Sequence::Paste: mNumSamples %s + src->mNumSamples %s would overflow."),
         // PRL:  Why bother with Internat when the above is just wxT?
         Internat::ToString(mNumSamples.as_double(), 0),
         Internat::ToString(src->mNumSamples.as_double(), 0));
      THROW_INCONSISTENCY_EXCEPTION;
   }

   const auto format = mSampleFormats.Stored();
   if (src->mSampleFormats.Stored() != format)
   {
      wxLogError(
         wxT("Sequence::Paste: Sample format to be pasted, %s, does not match destination format, %s."),
         GetSampleFormatStr(src->mSampleFormats.Stored()).Debug(),
         GetSampleFormatStr(format).Debug());
      THROW_INCONSISTENCY_EXCEPTION;
   }

   const BlockArray &srcBlock = src->mBlock;
   auto addedLen = src->mNumSamples;
   const size_t srcNumBlocks = src->mBlockCount.load(std::memory_order_relaxed);
   auto sampleSize = SAMPLE_SIZE(format);

   if (addedLen == 0 || srcNumBlocks == 0)
      return;

   const size_t numBlocks = mBlockCount.load(std::memory_order_relaxed);

   // Decide whether to share sample blocks or make new copies, when whole block
   // contents are used -- must copy if factories are different:
   auto pUseFactory =
      (src->mpFactory == mpFactory) ? nullptr : mpFactory.get();

   if (numBlocks == 0 ||
       (s == mNumSamples && mBlock.back().sb->GetSampleCount() >= mMinSamples)) {
      // Special case: this track is currently empty, or it's safe to append
      // onto the end because the current last block is longer than the
      // minimum size

      // Build and swap a copy so there is a strong exception safety guarantee
      BlockArray newBlock{ mBlock };
      sampleCount samples = mNumSamples;
      for (unsigned int i = 0; i < srcNumBlocks; i++)