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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. Compatibility of C and C++ - Wikipedia

    en.wikipedia.org/wiki/Compatibility_of_C_and_C++

    Differences between C and C++ linkage and calling conventions can also have subtle implications for code that uses function pointers. Some compilers will produce non-working code if a function pointer declared extern "C" points to a C++ function that is not declared extern "C". [22] For example, the following code:

  4. Inline function - Wikipedia

    en.wikipedia.org/wiki/Inline_function

    In C++, a function defined inline will, if required, emit a function shared among translation units, typically by putting it into the common section of the object file for which it is needed. The function must have the same definition everywhere, always with the inline qualifier. In C++, extern inline is the same as inline.

  5. Linkage (software) - Wikipedia

    en.wikipedia.org/wiki/Linkage_(software)

    This is also valid in C++. (C++ 98/03 deprecated this usage in favor of anonymous namespaces, but is no longer deprecated in C++ 11.) Also, C++ implicitly treats any const namespace-scope variable as having internal linkage unless it is explicitly declared extern, unlike C. A name's linkage is related to, but distinct from, its scope. The scope ...

  6. Forward declaration - Wikipedia

    en.wikipedia.org/wiki/Forward_declaration

    In C++, classes can be forward-declared if you only need to use the pointer-to-that-class type (since all object pointers are the same size, and this is what the compiler cares about). This is especially useful inside class definitions, e.g. if a class contains a member that is a pointer (or a reference) to another class.

  7. Foreign function interface - Wikipedia

    en.wikipedia.org/wiki/Foreign_function_interface

    The primary effect of the extern "C" declaration in C++ is to disable C++ name mangling. With other languages, separate utils or middleware are used, examples include: GNOME project: GObject Introspection; SWIG; Chromium project: Blink and V8 engine use an interface description language (IDL) compiler for standard JavaScript interfaces; Other ...

  8. One Definition Rule - Wikipedia

    en.wikipedia.org/wiki/One_Definition_Rule

    Some things, like types, templates, and extern inline functions, can be defined in more than one translation unit. For a given entity, each definition must have the same sequence of tokens. Non-extern objects and functions in different translation units are different entities, even if their names and types are the same.

  9. 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.