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The following is a declaration of the concept "equality_comparable" from the <concepts> header of a C++20 standard library. This concept is satisfied by any type T such that for lvalues a and b of type T, the expressions a==b and a!=b as well as the reverse b==a and b!=a compile, and their results are convertible to a type that satisfies the concept "boolean-testable":
5 value is a run-time notion, not the normal form of an expression. 2 comments. 6 Assignment: l-values and r-values. 1 comment. 7 Basic issues. 1 comment.
This category has the following 7 subcategories, out of 7 total. ... This page was last edited on 28 March 2022, ... Cookie statement;
refinements of the contracts facility (access control in contract conditions) [92] (see list of features deferred to a later standard) a revised memory model; smart pointer creation with default initialization; Changes applied to the C++20 working draft in the winter meeting in February 2019 (Kona) include: [93] [94] [95] coroutines; modules
R-values can be l-values (see below) or non-l-values—a term only used to distinguish from l-values. Consider the C expression 4 + 9 . When executed, the computer generates an integer value of 13, but because the program has not explicitly designated where in the computer this 13 is stored, the expression is a non l-value.
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.
Provides the container adapter class templates std::flat_set and std::flat_multiset. <forward_list> Added in C++11 and TR1. Provides the container class template std::forward_list, a singly linked list. <inplace_vector> Added in C++26. Provides the class std::inplace_vector, analogous to std::vector with a fixed capacity defined at compile time ...
computes the difference in seconds between two time_t values time: returns the current time of the system as a time_t value, number of seconds, (which is usually time since an epoch, typically the Unix epoch). The value of the epoch is operating system dependent; 1900 and 1970 are often used. See RFC 868. clock