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C++20 is a version of the ISO/IEC 14882 standard for the C++ programming language. C++20 replaced the prior version of the C++ standard, called C++17 , and was later replaced by C++23 . [ 1 ] The standard was technically finalized [ 2 ] by WG21 at the meeting in Prague in February 2020, [ 3 ] had its final draft version announced in March 2020 ...
Ever since the modules were introduced in C++20, there has been no support for standard library modules until C++23. These named modules were added to include all items declared in both global and std namespaces provided by the importable standard headers. Macros are not allowed to be exportable, so users have to manually include or import ...
Others are reduced to placeholders, such as (until C++20) <ciso646> for C95 <iso646.h>, all of whose requisite macros are rendered as keywords in C++98. C-specific syntactic constructs aren’t generally supported, even if their header is. [45] Several C headers exist primarily for C++ compatibility, and these tend to be near-empty in C++.
The C++ programming language was initially standardized in 1998 as ISO/IEC 14882:1998, which was then amended by the C++03, C++11, C++14, C++17, and C++20 standards. The current C++23 standard supersedes these with new features and an enlarged standard library .
C++23 is the name for the version of the International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC) 14882 standard for the C++ programming language that follows C++20. The final draft of this version is N4950.
In some object-oriented programming languages that lack direct support for modules, such as C++ before C++20, [8] a similar structure is instead provided by the class hierarchy, where classes are the basic unit of the program, and a class can have private methods.
C++ as of C++20 has the import and module directives for modules. [15] [16] These directives are the only ones that do not start with a # character; instead, they start with import and module respectively, optionally preceded by export.
Since C++20, however, modules were introduced offering similar functionality to Java packages, however C++ modules do not have the same granularity of Java packages which allowing for importing individual functions or classes - rather, in C++, only all symbols marked export are accessible after importing a module.