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MFC or Microsoft Foundation Classes is a library that wraps portions of the Windows API in C++ classes, including functionality that enables them to use a default application framework. Classes are defined for many of the handle-managed Windows objects and also for predefined windows and common controls

Features

When MFC was introduced, it provided C++ macros for Windows message-handling (via Message Maps), exceptions, run-time type identification (RTTI), serialization and dynamic class instantiation. The macros for message-handling were intended to reduce memory consumption by avoiding gratuitous virtual table use and also provide a more concrete structure for various Visual C++-supplied tools to edit and manipulate code without parsing the full language. The message-handling macros replaced the virtual function mechanism provided by C++.

The macros for serialization, exceptions, and RTTI predated availability of these features in C++ by a number of years. 32-bit versions of MFC, for Windows NT 3.1 and later Windows operating systems, used compilers that implemented the language features and updated the macros to simply wrap the language features instead of providing customized implementations, realizing upward compatibility  

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