Function MutableBlock

paddle/fluid/framework/program_desc.h:48–54

  BlockDesc *AppendBlock(const BlockDesc &parent);

  BlockDesc *MutableBlock(size_t idx) {
    if (idx == static_cast<size_t>(kNoneBlockIndex)) {
      return nullptr;
    } else {
      return blocks_[idx].get();
    }
  }

  const BlockDesc &Block(size_t idx) const { return *blocks_[idx]; }