C++ High Performance

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Title: C++ High Performance Author: Bjorn Andrist and Viktor Sehr

Chapter 1: A brief Introduction to C++

(klement: This chapter briefly explains C++ which most people should know but contains some key insights that I have overlooked)

Zero-overhead principle by Bjarne:

  • What you don’t use, you don’t pay
  • What you do use, you couldn’t hand code any better

Non-performance-related C++ language features (klement: I am aware of these features but this section provides a very good structured answer as to why C++. Could be useful in interviews.)

  • Value Semantics:
    • Allows callers to be guaranteed that their provided arguments will not be modified as all arguments are copied.
  • Cons correctness:
    • Provide const guarantees in compile time. Available in java (final) but it is more flexible as member functions can be delclared const
  • Object ownership: with RAII and smart pointers we can clearly express the object ownership. In Java all resource have shared ownership.
  • Deterministic destruction:
    • Uses RAII for destruction which is deterministic.
  • Avoiding null objects with references:
    • As references in C++ cannot be null and reassigned, functions that takes parameters as reference can be guaranteed that the argument is not a null object.

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