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2. include guard - Wikipedia

   en.wikipedia.org/wiki/Include_guard

   For #include guards to work properly, each guard must test and conditionally set a different preprocessor macro. Therefore, a project using #include guards must work out a coherent naming scheme for its include guards, and make sure its scheme doesn't conflict with that of any third-party headers it uses, or with the names of any globally visible macros.

3. Include directive - Wikipedia

   en.wikipedia.org/wiki/Include_directive

   The header keeps the interface separate from the implementation. [3] Compilation errors may occur if multiple header files include the same file. One solution is to avoid including files in header files – possibly requiring excessive include directives in body files. Another solution is to use an include guard in each header file. [4]

4. C++ Standard Library - Wikipedia

   en.wikipedia.org/wiki/C++_Standard_Library

   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 headers that emit macros for use. The C++ standard has reserved std and std.* as module names. [11]

5. Prefix header - Wikipedia

   en.wikipedia.org/wiki/Prefix_header

   As a result, explicit includes of the above header files in any Objective-C code file do not imply a second inclusion because of the #import directive of Objective-C, or more generally with #include because of the use of include guards; hence, these includes can be forgotten, but it is advocated [1] to have them explicitly written in order to keep the source code autonomous and reusable, and ...

6. C++23 - Wikipedia

   en.wikipedia.org/wiki/C++23

   Clarify C headers. "The headers are not useful in code that is only required to be valid C++. Therefore, the C headers should be provided by the C++ standard library as a fully-supported, not deprecated part, but they should also be discouraged for use in code that is not polyglot interoperability code.

7. windows.h - Wikipedia

   en.wikipedia.org/wiki/Windows.h

   windows.h is a source code header file that Microsoft provides for the development of programs that access the Windows API (WinAPI) via C language syntax. It declares the WinAPI functions, associated data types and common macros. Access to WinAPI can be enabled for a C or C++ program by including it into a source file: #include <windows.h>

8. C POSIX library - Wikipedia

   en.wikipedia.org/wiki/C_POSIX_library

   The C POSIX library is a specification of a C standard library for POSIX systems. It was developed at the same time as the ANSI C standard. Some effort was made to make POSIX compatible with standard C; POSIX includes additional functions to those introduced in standard C.

9. Precompiled header - Wikipedia

   en.wikipedia.org/wiki/Precompiled_header

   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.