By Herb Sutter
Extra unheard of C++ keeps the place Herb Sutter's best-selling extraordinary C++ left off, supplying forty puzzles that remove darkness from the main not easy -- and strongest -- facets of C++. extra unheard of C++ bargains many new puzzles interested by popular programming and the C++ usual Template Library, together with very important options resembling features and predicates, in addition to key issues in utilizing usual bins and algorithms -- a lot of them by no means lined in other places. extra unprecedented C++ includes a unique new part (and appendices) on optimization in unmarried- and multithreaded environments. It additionally offers very important new insights on an important subject matters first brought in remarkable C++, together with exception defense, established programming, and reminiscence administration. For all C++ programmers.
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Extra resources for More Exceptional C++: 40 New Engineering Puzzles, Programming Problems, and Solutions
Sample text
It is necessary to profile after every change to compare the performance with and without the change. If the change impairs performance, then reversion to the old code should be made. Even if there is no effect on performance, the reversion should be made, because any change presents a risk to the stability of the application. It would be unwise to take such a risk unless the gain is sufficient. Creating profiling tests is easy for non-interactive applications, but a little bit more work is required to create repeatable tests for interactive applications.
Profile (profiler) 4. Test (test framework) 5. Keep or revert (source control) Each of these steps is important, and therefore the tools that are associated with them are a necessary part of the development process. 2007 12:28:38] Summary < Day Day Up > Summary Premature Optimization symptoms are: ● Most optimizations performed before the final stages of development. ● Poor readability and maintainability caused by optimized code. ● Unnecessary constraints imposed early in development. ● Poor optimizations performed early without the necessary knowledge of the complete application.
Sometimes this optimization is not even performed when it is necessary, leading to missed deadlines, extra expense, and in some cases project cancellation. Therefore, you will rarely see this type as a premature optimization, and instead should look for the opposite case of resistance to change or remove features when approaching the end of development. Why Past Mistakes One common occurrence that leads to our assumption that we know what is slow and how to take care of it early is our attempt to learn from past mistakes.