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  2. External variable - Wikipedia

    en.wikipedia.org/wiki/External_variable

    The static keyword (static and extern are mutually exclusive), applied to the definition of an external variable, changes this a bit: the variable can only be accessed by the functions in the same module where it was defined. But it is possible for a function in the same module to pass a reference (pointer) of the variable to another function ...

  3. Weak symbol - Wikipedia

    en.wikipedia.org/wiki/Weak_symbol

    For example, a binary is dynamically linked against libraries libfoo.so and libbar.so. libfoo defines symbol f and declares it as weak. libbar also defines f and declares it as strong. Depending on the library ordering on the link command line (i.e. -lfoo -lbar ) the dynamic linker uses the weak f from libfoo.so although a strong version is ...

  4. Inline function - Wikipedia

    en.wikipedia.org/wiki/Inline_function

    In the C and C++ programming languages, an inline function is one qualified with the keyword inline; this serves two purposes: . It serves as a compiler directive that suggests (but does not require) that the compiler substitute the body of the function inline by performing inline expansion, i.e. by inserting the function code at the address of each function call, thereby saving the overhead ...

  5. Foreign function interface - Wikipedia

    en.wikipedia.org/wiki/Foreign_function_interface

    D does it the same way as C++ does, with extern "C" through extern (C++) Dart includes dart:ffi [ 10 ] library to call native C code for mobile, command-line , and server applications Dynamic programming languages , such as Python , Perl , Tcl , and Ruby , all provide easy access to native code written in C, C++, or any other language obeying C ...

  6. Virtual method table - Wikipedia

    en.wikipedia.org/wiki/Virtual_method_table

    The C++ standards do not mandate exactly how dynamic dispatch must be implemented, but compilers generally use minor variations on the same basic model. Typically, the compiler creates a separate virtual method table for each class.

  7. getopt - Wikipedia

    en.wikipedia.org/wiki/Getopt

    getopt is a system dependent function, and its behavior depends on the implementation in the C library. Some custom implementations like gnulib are available, however. [6]The conventional (POSIX and BSD) handling is that the options end when the first non-option argument is encountered, and that getopt would return -1 to signal that.

  8. Usage message - Wikipedia

    en.wikipedia.org/wiki/Usage_message

    In computer programming, a usage message or help message is a brief message displayed by a program that utilizes a command-line interface for execution. This message usually consists of the correct command line usage for the program and includes a list of the correct command-line arguments or options acceptable to said program.

  9. Global variable - Wikipedia

    en.wikipedia.org/wiki/Global_variable

    Such extern declarations are often placed in a shared header file, since it is common practice for all .c files in a project to include at least one .h file: the standard header file errno.h is an example, making the errno variable accessible to all modules in a project.