Tag Archive for: Haskell

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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,…

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…

CharakteristikeImmutableDataEng

Immutable Data

January 28, 2017

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A key to purely functional languages is that their data are immutable. Therefore, assignments such as…

timeline.FunktionalInCpp17Cpp20Eng

Functional in C++17 and C++20

January 21, 2017

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Which functional feature can we expect with C++17, and for which functional feature can we hope with…

Latest news

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 […]