libsigc++ 2.12.0

exception_catch()
Adaptors

sigc::exception_catch() catches an exception thrown from within the wrapped functor and directs it to a catcher functor.

sigc::exception_catch() catches an exception thrown from within the wrapped functor and directs it to a catcher functor.

This catcher can then rethrow the exception and catch it with the proper type.

Note that the catcher is expected to return the same type as the wrapped functor so that normal flow can continue.

Catchers can be cascaded to catch multiple types, because uncaught rethrown exceptions proceed to the next catcher adaptor.

Examples:
  struct my_catch
  {
  int operator()()
  {
  try { throw; }
  catch (std::range_error e) // catch what types we know
  { std::cerr << "caught " << e.what() << std::endl; }
  return 1;
  }
  }
  int foo(); // throws std::range_error
  sigc::exception_catch(&foo, my_catch())();
  std::endl
  basic_ostream< _CharT, _Traits > & endl(basic_ostream< _CharT, _Traits > &__os)
  std::cerr
  ostream cerr
  std::range_error::what
  virtual const char * what() const noexcept
  std::range_error
  sigc::exception_catch
  exception_catch_functor< T_functor, T_catcher > exception_catch(const T_functor &_A_func, const T_catcher &_A_catcher)
  Definition: exception_catch.h:326

The functor sigc::exception_catch() returns can be directly passed into sigc::signal::connect().

Example:
  sigc::signal<int> some_signal;
  some_signal.connect(sigc::exception_catch(&foo, my_catch));
  sigc::signal7::connect
  iterator connect(const slot_type &slot_)
  Add a slot to the list of slots.
  Definition: signal.h:3871
  sigc::signal
  Convenience wrapper for the numbered sigc::signal# templates.
  Definition: signal.h:4015