C++ Need Comments / FormattingOutcomedoublevector() and ~doublevector()Properly sets pointer to nullptr and mNumValues to 0. Outcome.at() and .at() constUses the given code for index checking--return

C++ 

• Need Comments / FormattingOutcomedoublevector() and ~doublevector()Properly sets pointer to nullptr and mNumValues to 0.
• Outcome.at() and .at() constUses the given code for index checking--returns the correct element based on the index.
• Outcomepush_back()Calls resize().
• Outcomeresize()Properly handles when new_size = 0, new_size > current_size, and new_size < current_size.
• OutcomePointersNo dangling pointers and no memory leaks are apparent.
• OutcomeEfficiency / Other