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pointer to function;; pointer to member function;; functor;; lambda expression.; std::function is a template class that can hold any callable object that matches its signature.; In C++, any class that overloads the function call operator operator() may be called using function-call syntax.
The definition of the type char has been modified to explicitly express that it is at least the size needed to store an eight-bit coding of UTF-8, and large enough to contain any member of the compiler's basic execution character set. It was formerly defined as only the latter in the C++ standard itself, then relying on the C standard to ...
The above modules export the entire C++ standard library, meaning that as of currently, the standard library must be imported in its entirety. Furthermore, modules do not allow for granular imports of specific namespaces or classes within a module, nor does it allow for using wildcard imports, unlike Java or Rust which do allow for the ...
In C++ computer programming, copy elision refers to a compiler optimization technique that eliminates unnecessary copying of objects.. The C++ language standard generally allows implementations to perform any optimization, provided the resulting program's observable behavior is the same as if, i.e. pretending, the program were executed exactly as mandated by the standard.
Inline variables, which allows the definition of variables in header files without violating the one definition rule. The rules are effectively the same as inline functions __has_include , allowing the availability of a header to be checked by preprocessor directives [ 25 ]
The variadic template feature of C++ was designed by Douglas Gregor and Jaakko Järvi [1] [2] and was later standardized in C++11. Prior to C++11, templates (classes and functions) could only take a fixed number of arguments, which had to be specified when a template was first declared.
When used in a variable's definition (e.g., auto x = 11;), the auto keyword indicates type inference. The data type for that x will be deduced from its initialization. The return type of a function can also be inferred by using auto without specifying a trailing return type (e.g.
Many new keywords added (and the new "spaceship operator", operator <=>), such as concept, constinit, [38] consteval, co_await, co_return, co_yield, requires (plus changed meaning for export), and char8_t (for UTF-8 support). [57] And explicit can take an expression since C++20. [58] Most of the uses of the volatile keyword have been deprecated ...