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allow pack expansions in lambda init-capture; string literals as template parameters; atomic smart pointers (such as std::atomic<shared_ptr<T>> and std::atomic<weak_ptr<T>>) std::to_address to convert a pointer to a raw pointer; Changes applied to the C++20 working draft in March 2018 (Jacksonville) include: [88]
Most of Library Fundamentals TS I, including: [29] [30] std::string_view, a read-only non-owning reference to a character sequence or string-slice [31]; std::optional, for representing optional objects, a data type that may not always be returned by a given algorithm with support for non-return
Lambda lifting is a meta-process that restructures a computer program so that functions are defined independently of each other in a global scope.An individual "lift" transforms a local function into a global function.
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.
C++23, formally ISO/IEC 14882:2024, [1] is the current open standard for the C++ programming language that follows C++20.The final draft of this version is N4950. [2] [3]In February 2020, at the final meeting for C++20 in Prague, an overall plan for C++23 was adopted: [4] [5] planned features for C++23 were library support for coroutines, a modular standard library, executors, and networking.
C++11 allowed lambda functions to deduce the return type based on the type of the expression given to the return statement. C++14 provides this ability to all functions. It also extends these facilities to lambda functions, allowing return type deduction for functions that are not of the form return expression;.
In computer programming, a subroutine (a.k.a. function) will often inform calling code about the result of its computation, by returning a value to that calling code. The data type of that value is called the function's return type.
Calling f with a regular function argument first applies this function to the value 2, then returns 3. However, when f is passed to call/cc (as in the last line of the example), applying the parameter (the continuation) to 2 forces execution of the program to jump to the point where call/cc was called, and causes call/cc to return the value 2.