Archive for category: C++20

TimelineCpp20CoreLanguage

Calendar and Time-Zones in C++20: Calendar Dates

November 1, 2020

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A new type of the chrono extension in C++20 is a calendar date. C++20 offers various ways to create a…

TimelineCpp20CoreLanguage

Calendar and Time-Zones in C++20: Time of Day

October 25, 2020

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With C++20, the chrono library from C++11 receives essential additions. The most prominent ones are calendar…

TimelineCpp20CoreLanguage

Calendar and Time-Zones in C++20: Time-Zones

October 23, 2020

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This post concludes my introduction to the chrono extension in C++20. Today I present the time-zones…

TimelineCpp20CoreLanguage

More and More Utilities in C++20

October 18, 2020

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Today, I present a few utilities for calculating the midpoint of two values, checking if a std::string…

TimelineCpp20CoreLanguage

Calendar and Time-Zones in C++20: Handling Calendar Dates

October 18, 2020

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In my last post, "Calendar and Time Zone in C++20: Calendar Dates", I presented the new calendar-related…

TimelineCpp20CoreLanguage

C++20: Extend std::format for User-Defined Types

October 11, 2020

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Peter Gottschling presented in his last post "std::format in C++20" the basics of the new formatting…

TimelineCpp20CoreLanguage

std::format in C++20

October 2, 2020

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Today, I'm happy to present Peter Gottschling's guest post to the new formatting library in C++20: std::format.…

TimelineCpp20CoreLanguage

More Convenience Functions for Containers with C++20

September 24, 2020

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Removing elements from a container or asking if an associative container has a specific key is too complicated.…

TimelineCpp20CoreLanguage

constexpr std::vector and std::string in C++20

September 16, 2020

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Probably the most viral keyword in modern C++ is constexpr. With C++20, we have a constexpr std::vector…

TimelineCpp20CoreLanguage

std::span in C++20: Bounds-Safe Views for Sequences of Objects

September 8, 2020

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In my seminar, I often hear the question: How can I safely pass a plain array to a function? With C++20,…

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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 […]