Archive for category: C++17

Optimization with Allocators in C++17

October 9, 2023

Thanks to polymorphic allocators in C++17, you can optimize your memory allocation. This optimization…

Special Allocators with C++17

October 2, 2023

I introduced in my last post "Polymorphic Allocators with C++17" the theory of polymorphic allocators…

Polymorphic Allocators in C++17

September 25, 2023

This post starts a miniseries about an almost unknown feature in C++17: polymorphic allocators. I often…

C++ Parallel STL Benchmark

August 14, 2023

Today, I'm happy to present a guest post from Victor J. Duvanenko about my favorite C++17 feature: the…

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Performance of the Parallel STL Algorithms

July 22, 2021

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In my last post, "Parallel Algorithms of the STL with the GCC Compiler", I presented the necessary theory…

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Parallel Algorithms of the STL with the GCC Compiler

July 16, 2021

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GCC supports my favorite C++17 feature: the Standard Template Library (STL) parallel algorithms. I recognized…

C++17: Improved Associative Containers and Uniform Container Access

May 7, 2017

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C++11 has eight associative containers. With C++17, you can more comfortably insert new elements into…

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C++17: New Parallel Algorithms of the Standard Template Library

May 1, 2017

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The idea is quite simple. The Standard Template (STL) has more than 100 algorithms for searching, counting,…

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C++17 has a Visitor

April 23, 2017

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What have std::optional, std::any, and std::variant in common? You can construct them in place. But that…

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C++17 – Avoid Copying with std::string_view

April 16, 2017

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The purpose of std::string_view is to avoid copying data already owned by someone else and of which only…

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C++26 Core Language: Small ImprovementsNovember 4, 2024 - 8:34 am
There are more small improvements in the C++26 language, which you should know. static_assert extension First, here’s the syntax of static_assert in C++11: static_assert(compile time predicate, unevaluated string) With C++26, the string can be a user-defined type having the following properties: static_assert can now be used with a format string. Here’s a nice example from […]
Placeholders and Extended Character SetOctober 28, 2024 - 10:19 am
Placeholders are a nice way to highlight variables that are no longer needed. Additionally, the character set of C++26 will be extended. Placeholders Structured bindings are a C++17 feature that allows you to bind multiple variables to the elements of a structured object. The following program demonstrates using tuples and structured bindings to return and […]
Contracts in C++26October 21, 2024 - 9:54 am
Contracts allow you to specify preconditions, postconditions, and invariants for functions. Contracts should already be part of C++20 but were removed in the standard meeting in Cologne. Here is what Herb Sutter said about contracts on Sutter’s Mill: “contracts is the most impactful feature of C++20 so far, and arguably the most impactful feature we […]
Reflection in C++26: Determine the LayoutOctober 14, 2024 - 9:42 am
Thanks to reflection, you can determine the layout of types. My examples are based on the reflection proposal P2996R5. Class Layout The following program determines the class layout of a few members. // classLayout.cpp #include <experimental/meta> #include <iostream> #include <utility> #include <vector> #include <array> struct member_descriptor { std::size_t offset; std::size_t size; bool operator==(member_descriptor const&) const […]
Reflection in C++26: Metafunctions for Enums and ClassesOctober 7, 2024 - 1:53 pm
Today, I continue my journey through reflection in C++26 and play with enums and classes. The names of the metafunctions to access an Enum or a Class member are often identical. Access the Members of an Enum The following program is based on one by Daveed Vandevoorde. Daveed is one of the fathers of reflection, […]
Reflection in C++26: MetafunctionsSeptember 30, 2024 - 10:14 am
Reflection offers many metafunctions that run at compile time. The metafunctions are declared as consteval. consteval creates a so-called immediate function. Each invocation of an immediate function creates a compile-time constant. To say it more directly. A consteval (immediate) function is executed at compile-time. Read more about consteval and constinit in my previous post: Two […]