Tag Archive for: Associative Containers

Posts

C++23: Four new Associative Containers

September 4, 2023

The four associative containers std::flat_map, std::flat_multimap, std::flat_set, and std::flat_multiset…

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C++ Core Guidelines: Avoid Bounds Errors

June 5, 2019

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When you access an element outside a container of the STL, the result is not so promising. Your effect…

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More special Friends with std::map and std::unordered_map

May 29, 2019

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Modern C++ has eight associative containers, but your special friends should be std::map and std::unordered_map.…

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C++ Core Guidelines: More about Control Structures

March 9, 2018

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My last German post C++ Core Guidelines: To Switch or not to Switch, that is the Question got…

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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Functional in C++11 and C++14: Dispatch Table and Generic Lambdas

January 19, 2017

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My favorite example, the dispatch table, shows how nicely the features in modern C++ work together. A…

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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…

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Hash Functions

November 27, 2016

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

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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…

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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…

Latest news

std::execution: SenderDecember 16, 2024 - 11:25 am
std::execution offers three types of senders: factories, adapters, and consumers. I’ll take a closer look at these today. Most of the following content is from proposal P2300R10. I will try to represent it more concisely. Sender Factory A sender factory is an algorithm that takes no senders as parameters and returns a sender. execution::schedule execution::sender […]
std::execution: Composition of SendersDecember 9, 2024 - 10:25 am
Most sender adaptors are composable using the pipe operator. Let me start with a simple example of composition with the pipe operator. Instead of the nested function calls call1(call2(input)) you can write call1 | call2(input) or even: input | call1 | call2 Function composition Okay, this example was straightforward. Let’s do something more complicated. Proposal […]
std::execution: Inclusive ScanDecember 2, 2024 - 10:30 am
Inclusive scan solves problems related to range queries, such as calculating the sum of a range of elements in an array. It is also used in range minimum queries and various other algorithms. Before I present the asynchronous inclusive scan, I introduce the inclusive scan, aka prefix sum. Prefix Sum In computer science, the prefix […]
std::execution: Asynchronous AlgorithmsNovember 25, 2024 - 9:06 am
std::execution supports many asynchronous algorithms for various workflows. Presenting proposal P2300R10 is not easy. First, it is very powerful, and second, it is very long. Therefore, I concentrate on specific aspects of the proposal. What are the priorities of this proposal? Priorities The terms execution resource, execution agent, and scheduler are essential for the understanding […]
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 […]