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Modern C++ Programming Cookbook

Modern C++ Programming Cookbook - Third Edition

By : Marius Bancila
4.6 (21)
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Modern C++ Programming Cookbook

Modern C++ Programming Cookbook

4.6 (21)
By: Marius Bancila

Overview of this book

The updated third edition of Modern C++ Programming Cookbook addresses the latest features of C++23, such as the stacktrace library, std::expected and std::mdspan classes, the header, formatting library improvements, and updates to the ranges library. It also gets into more C++20 topics not previously covered, such as sync streams and source_location. The book is organized into practical recipes covering a wide range of real-world problems, helping you find the solutions you need quickly. You’ll find coverage of all the core concepts of modern C++ programming and features and techniques from C++11 through to C++23, meaning you’ll stay ahead of the curve by learning to incorporate the newest language and library improvements. Beyond the core concepts and new features, you’ll explore recipes related to performance and best practices, how to implement useful patterns and idioms, like pimpl, named parameter, attorney-client, and the factory pattern, and how to complete unit testing with the widely used C++ libraries: Boost.Test, Google Test, and Catch2. With the comprehensive coverage this C++ programming guide offers, by the end of the book you’ll have everything you need to build performant, scalable, and efficient applications in C++.
Table of Contents (15 chapters)
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13
Other Books You May Enjoy
14
Index

Optimizing code in constant-evaluated contexts

In the previous two recipes, we learned about constexpr functions, which allow functions to be evaluated at compile time if all their inputs are available at compile time, and immediate functions (in C++20), which are guaranteed to always be evaluated at compile time (or otherwise, produce an error). An important aspect of constexpr functions is constant-evaluated contexts; these are code paths where all expressions and functions are evaluated at compile time. A constant-evaluated context is useful for optimizing code more effectively. On the other hand, the invocation of immediate functions from constexpr functions is only possible in C++23. In this recipe, we will learn about utilizing constant-evaluated contexts.

How to do it…

To determine whether a function context is constant-evaluated in order to provide compile-time implementations use the following:

  • In C++20, the std::is_constant_evaluated() library function...
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