With C++20 we get two new keywords: consteval and constinit. consteval produces a function that is executed at compile-time and constinit guarantees that a variable is initialized at compile-time.
Designated initialization is an extension of aggregate initialization and empowers you to directly initialize the members of a class type using their names.
In this post, I conclude my miniseries to the three-way comparison operator with a few subtle details. The subtle details include the compiler-generated the == and != operators and the interplay of classical comparison operators and the three-way comparison operator.
The compiler performs quite a clever job when it generates all six comparison operators. On the end, you get the intuitive and efficient comparison operators for free. Let me dive with this post into the details of the spaceship operator.
The three-way comparison operator <=> is often just called spaceship operator. The spaceship operator determines for two values A and B whether A < B, A = B, or A > B. You can define the spaceship operator or the compiler can auto-generate it for you.
So far, I have written in my last four posts the basics you should know about modules in C++20. Only a few questions to modules are still open. In this post, I address these open questions, such as templates in modules, the linkage of modules, and header units.
When your module becomes bigger you want to divide its functionality into manageable components. C++20 modules offer two approaches: submodules and partitions. Let me discuss both approaches in this post.
Thanks to the module interface unit and the module implementation unit, you can separate the interface from the implementation when defining a module. Let me show, how.
Modules are one of the four prominent features of C++20. They overcome the restrictions of header files and promise a lot: faster build-times, fewer violations of the One-Definition-Rule, less usage of the preprocessor. Today, I want to create a simple math module.
Modules are one of the four big features of C++20: concepts, ranges, coroutines, and modules. Modules promise a lot: compile-time improvement, isolation of macros, the abolition of header files, and ugly workarounds.
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