Archive for category: Embedded

rehashLinux

Buckets, Capacity, and Load Factor

November 29, 2016

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The hash function maps a potentially infinite number of keys on a finite number of buckets. What is the…

hashfunction

Hash Functions

November 27, 2016

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The hash function is responsible for the unordered associative containers' constant access time (best…

windows

Associative Containers – A simple Performance Comparison

November 25, 2016

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Before I take a deeper look insight the interface of the hash tables - officially called unordered associative…

geordneteAssoziativeArrays

Hash Tables

November 24, 2016

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We missed the hash table in C++ for a long time. They promise to have constant access time. C++11 has…

ContainerVersusElement

Type-Traits: Performance Matters

November 21, 2016

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If you look carefully, you see type-traits have a big optimization potential. The type-traits support…

constexpr11

constexpr Functions

November 15, 2016

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constexpr functions are functions that can be executed at compile time. Sounds not so thrilling. But…

userdefinedTypes

constexpr – Variables and Objects

November 13, 2016

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If you declare a variable as constexpr the compiler will evaluate them at compile time. This holds not…

userdefinedLiteralsConstexprResult

Constant Expressions with constexpr

November 11, 2016

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You can define with the keyword constexpr an expression that can be evaluated at compile time. constexpr…

inline

inline

November 7, 2016

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Thanks to inline, the compiler can replace the function call with the function body. There are two reasons…

null

The Null Pointer Constant nullptr

November 6, 2016

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The new null pointer nullptr cleans up in C++ with the ambiguity of 0 and the macro NULL. The number…

Latest news

std::executionNovember 18, 2024 - 9:03 am
std::execution, previously known as executors or Senders/Receivers, provides “a Standard C++ framework for managing asynchronous execution on generic execution resources“. (P2300R10) Side Note Change of plans. My original plan was to present the C++26 library after the core language. However, the implementation status of the library is not good enough. Therefore, I decided to continue […]
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, […]