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In assembly, C, C++, Pascal, Modula2 and other languages, a callback function is stored internally as a function pointer. Using the same storage allows different languages to directly share callbacks without a design-time or runtime interoperability layer. For example, the Windows API is accessible via multiple languages, compilers and assemblers.
The call to d->f1() passes a B1 pointer as a parameter. The call to d->f2() passes a B2 pointer as a parameter. This second call requires a fixup to produce the correct pointer. The location of B2::f2 is not in the virtual method table for D. By comparison, a call to d->fnonvirtual() is much simpler: (*
madCodeHook is a commercial x86 and x64 API hooking and DLL injection library for C++ and Delphi. EasyHook is an open source hooking engine supporting x86 and x64 in Windows in both user and kernel land. SpyStudio Application Trace SpyStudio is an Application tracer which hook calls, displaying the results in a structured way.
This particular use of the CRTP has been called "simulated dynamic binding" by some. [10] This pattern is used extensively in the Windows ATL and WTL libraries. To elaborate on the above example, consider a base class with no virtual functions. Whenever the base class calls another member function, it will always call its own base class functions.
Virtual functions allow a program to call methods that don't necessarily even exist at the moment the code is compiled. [citation needed] In C++, virtual methods are declared by prepending the virtual keyword to the function's declaration in the base class. This modifier is inherited by all implementations of that method in derived classes ...
The calling convention of a given program's language may differ from the calling convention of the underlying platform, OS, or of some library being linked to. For example, on 32-bit Windows, operating system calls have the stdcall calling convention, whereas many C programs that run there use the cdecl calling convention. To accommodate these ...
Procedure calls can be synchronous or asynchronous. Synchronous procedure calls are made on one thread in a series, with each call waiting for the prior call to complete. on some thread. APCs instead are made without waiting for prior calls to complete.
Jami, with GTK/Qt GUI, also supports IAX2 protocol, for Linux, OS X, Windows GPL; Jitsi, a Java VoIP and Instant Messaging client with ZRTP encryption, for FreeBSD, Linux, OS X, Windows; LGPL; Linphone, with a core/UI separation, the GUI is using Qt libraries, for Linux, OS X, Windows, and mobile phones (Android, iPhone, Windows Phone, BlackBerry)