Book Image

C++ High Performance - Second Edition

By : Björn Andrist, Viktor Sehr
5 (2)
Book Image

C++ High Performance - Second Edition

5 (2)
By: Björn Andrist, Viktor Sehr

Overview of this book

C++ High Performance, Second Edition guides you through optimizing the performance of your C++ apps. This allows them to run faster and consume fewer resources on the device they're running on without compromising the readability of your codebase. The book begins by introducing the C++ language and some of its modern concepts in brief. Once you are familiar with the fundamentals, you will be ready to measure, identify, and eradicate bottlenecks in your C++ codebase. By following this process, you will gradually improve your style of writing code. The book then explores data structure optimization, memory management, and how it can be used efficiently concerning CPU caches. After laying the foundation, the book trains you to leverage algorithms, ranges, and containers from the standard library to achieve faster execution, write readable code, and use customized iterators. It provides hands-on examples of C++ metaprogramming, coroutines, reflection to reduce boilerplate code, proxy objects to perform optimizations under the hood, concurrent programming, and lock-free data structures. The book concludes with an overview of parallel algorithms. By the end of this book, you will have the ability to use every tool as needed to boost the efficiency of your C++ projects.
Table of Contents (17 chapters)
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Avoiding constructing objects using proxy objects

Eager evaluation can have the undesirable effect that objects are unnecessarily constructed. Often this is not a problem, but if the objects are expensive to construct (because of heap allocations, for example), there might be legitimate reasons to optimize away the unnecessary construction of short-lived objects that serve no purpose.

Comparing concatenated strings using a proxy

We will now walk through a minimal example of using proxy objects to give you an idea of what they are and can be used for. It's not meant to provide you with a general production-ready solution to optimizing string comparisons.

With that said, take a look at this code snippet that concatenates two strings and compares the result:

auto a = std::string{"Cole"}; 
auto b = std::string{"Porter"}; 
auto c = std::string{"ColePorter"}; 
auto is_equal = (a + b) == c;        // true

Here is a visual representation...