The Typesafe Signal Framework for C++ http://libsigc.sourceforge.net/
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libsigc++2

Libsigc++ implements a typesafe callback system for standard C++. It allows you to define signals and to connect those signals to any callback function, either global or a member function, regardless of whether it is static or virtual. It also contains adaptor classes for connection of dissimilar callbacks and has an ease of use unmatched by other C++ callback libraries. Features:

  • Compile time typesafe callbacks (faster than run time checks)
  • Typesafety violations report line number correctly with template names (no tracing template failures into headers)
  • No compiler extensions or meta compilers required
  • Proper handling of dynamic objects and signals (deleted objects will not cause seg faults)
  • Extendable API at any level: signal, slot, connection and trackable
  • Extensions do not require alteration of basic components
  • User definable accumulators
  • A variety of adaptors to change the callback signature: bind, hide, retype, compose and lambda call groups
  • Various compilers and platforms are supported: gcc, cygwin, mingw32, MS .NET 2003, Sun Forte C++, Compaq C++, Intel C++