Archive for category: C++20

TimelineCpp20CoreLanguage

volatile and Other Small Improvements in C++20

August 17, 2020

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Today, I complete my tour through the C++20 core language features with a few small improvements. One…

TimelineCpp20CoreLanguage

New Attributes with C++20

August 13, 2020

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With C++20, we got new and improved attributes such as [[nodiscard("reason")]], [[likely]], [[unlikely]],…

TimelineCpp20CoreLanguage

More Lambda Features with C++20

August 7, 2020

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Lambdas in C++20 can be default-constructed and support copy-assignment when they have no state. Lambdas…

TimelineCpp20CoreLanguage

More Powerful Lambdas with C++20

July 31, 2020

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Thanks to C++20, lambdas have become more powerful. From the various lambda improvements, template parameters…

TimelineCpp20CoreLanguage

Various Template Improvements with C++20

July 24, 2020

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Admittedly, I present in this post a few minor improvements to templates and C++20 in general. Although…

TimelineCpp20

Solving the Static Initialization Order Fiasco with C++20

July 11, 2020

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According to the FAQ of isocpp.org is the static initialization order fiasco "a subtle way to crash…

TimelineCpp20

Two new Keywords in C++20: consteval and constinit

July 9, 2020

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With C++20, we get two new keywords: consteval and constinit. consteval produces a function executed…

TimelineCpp20

Designated Initializers

July 2, 2020

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Designated initialization is an extension of aggregate initialization and empowers you to directly initialize…

TimelineCpp20

C++20: Optimized Comparison with the Spaceship Operator

June 25, 2020

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In this post, I conclude my miniseries on the three-way comparison operator with a few subtle details.…

TimelineCpp20

C++20: More Details to the Spaceship Operator

June 16, 2020

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The compiler performs cleverly when it generates all six comparison operators. Ultimately, you get intuitive…

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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 […]