Archive for category: Functional

conceptsIntegralVariations

Placeholders – The Second

March 11, 2017

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The unification of templates, concepts, and placeholders goes on. This time, I will look closely at constrained…

slice

Concepts – Placeholders

March 5, 2017

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C++11 has auto unconstrained placeholders. You can use concepts in C++20 as constrained placeholders.…

vectorArithmeticOperatorOverloading

Expression Templates

February 14, 2017

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Expression templates are "structures representing a computation at compile-time, which are evaluated…

lazy

C++ is Lazy: CRTP

February 12, 2017

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In my previous post, Recursion, List Manipulation, and Lazy Evaluation, I wrote about the characteristics…

optional

Monads in C++

February 10, 2017

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Monads in C++? What a strange name for a post. But it's not so strange. With std::optional, C++17 gets…

typeclass

Concepts

February 8, 2017

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We stay in the year 2020. With high probability, we will get concepts. Of course, waterproof statements…

lazy

The New Ranges Library

February 5, 2017

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A small-time jump, and we are in the year 2020. C++ will get - as far as the future is predictable -…

foldingExpressions

Fold Expressions

February 4, 2017

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With fold expressions, you can implement Haskell functions foldl, foldr, foldl1, and foldr1 directly…

CharakteristikRecursionEng

Recursion, List Manipulation, and Lazy Evaluation

February 1, 2017

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The remaining three characteristics of functional programming are told quite quickly: Recursion, manipulation…

Pure Functions

January 30, 2017

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Pure functions are pretty similar to mathematical functions. They are the reason that Haskell is called…

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Hazard Pointers in C++26May 5, 2025 - 11:12 am
Hazard pointers provide garbage collection in C++ and solve the ABA problem. First of all. What is a hazard pointer? Proposal P2530R3 gives a nice explanation: A hazard pointer is a single-writer multi-reader pointer that can be owned by at most one thread at any time. Only the owner of the hazard pointer can set […]
A Lock-Free Stack: A Hazard Pointer Implementation Explained IIApril 7, 2025 - 11:11 am
In my last post, I started to explain a hazard pointer implementation: A Lock-Free Stack: A Hazard Pointer Implementation Explained I. Today, I will continue to explain the implementation. The Retire List The retire list has the public member functions isInUse, addNode, and deleteUnusedNodes. Additionally, it has the inner class RetireNode, an atomic member of […]
A Lock-Free Stack: A Hazard Pointer Implementation Explained IMarch 24, 2025 - 11:37 am
In my last post, I presented a hazard pointer implementation: A Lock-Free Stack: A Hazard Pointer Implementation. Today, I will explain the implementation. MyNode is a class template, parametrized by the type it holds: data. MyNode models the concept Node. template <typename T> concept Node = requires(T a) { {T::data}; { *a.next } -> std::same_as<T&>; […]
A Lock-Free Stack: A Hazard Pointer ImplementationMarch 10, 2025 - 11:42 am
Hazard Pointers solve all issues of the previous implementation: A Lock-Free Stack: A Simple Garbage Collector. From one Week to two Weeks You may have already noticed. I will change my blog publishing frequency from one to two weeks in the future. Writing a post using your voice is exceptionally exhausting and time-consuming. Hazard Pointers […]
A Lock-Free Stack: A Simple Garbage CollectorFebruary 24, 2025 - 11:58 am
My next lock-free stack includes a simple garbage collector. I discussed the concurrent execution of more than one topAndPush call is a Race Condition. I can safely delete a node if not more than one topAndPush call is executing concurrently. This observation is crucial for solving this memory leak issue: I store removed nodes on […]
A Lock-Free Stack: Atomic Smart PointerFebruary 17, 2025 - 11:47 am
The easiest way to solve this memory leak issue from the last post is to use a std::shared_ptr. Atomic Smart Pointer There are two ways to apply atomic operations on a std::shared_ptr: In C++11, you can use the free atomic functions on std::shared_ptr. With C++20, you can use atomic smart pointers. C++11 Using atomic operations […]