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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 ...
The C preprocessor (used with C, C++ and in other contexts) defines an include directive as a line that starts #include and is followed by a file specification. COBOL defines an include directive indicated by copy in order to include a copybook. Generally, for C/C++ the include directive is used to include a header file, but can
In computer programming, a precompiled header (PCH) is a (C or C++) header file that is compiled into an intermediate form that is faster to process for the compiler.Usage of precompiled headers may significantly reduce compilation time, especially when applied to large header files, header files that include many other header files, or header files that are included in many translation units.
Translation units define a scope, roughly file scope, and functioning similarly to module scope; in C terminology this is referred to as internal linkage, which is one of the two forms of linkage in C. Names (functions and variables) declared outside of a function block may be visible either only within a given translation unit, in which case they are said to have internal linkage – they are ...
This typically occurs if a header file is included twice by the same source file without appropriate header guards. class C {}; // first definition of C class C {}; // error, second definition of C In the following, forming a pointer to S or defining a function taking a reference to S are examples of legal constructs, because they do not ...
Header-only libraries do not need to be separately compiled, packaged and installed in order to be used. All that is required is to point the compiler at the location of the headers, and then #include the header files into the application source. Another advantage is that the compiler's optimizer can do a much better job when all the library's ...
The C standard library, sometimes referred to as libc, [1] is the standard library for the C programming language, as specified in the ISO C standard. [2] Starting from the original ANSI C standard, it was developed at the same time as the C POSIX library, which is a superset of it. [3]
For C++ developers, C++/WinRT is the officially supported, modern C++ language projection. As of version 10.0.17134.0 (Windows 10, version 1803), the Microsoft Windows SDK contains a header-file-based standard C++ library for consuming first-party Windows APIs (that is, Windows Runtime APIs in Windows namespaces). [ 4 ]