Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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Class function_base

boost::function_base — The common base class for all Boost.Function objects. Objects of type function_base may not be created directly.

Synopsis

class function_base {
public:

  // capacity
  bool empty() const;

  // target access
  template<typename Functor> Functor* target();
  template<typename Functor> const Functor* target() const;
  template<typename Functor> bool contains(const Functor&) const;
  const std::type_info& target_type() const;
};

Description

function_base capacity

  1. bool empty() const;

    Returns:

    false if this has a target, and true otherwise.

    Throws:

    Will not throw.

function_base target access

  1. template<typename Functor> Functor* target();
    template<typename Functor> const Functor* target() const;

    Returns:

    If this stores a target of type Functor, returns the address of the target. Otherwise, returns the NULL pointer.

    Throws:

    Will not throw.
  2. template<typename Functor> bool contains(const Functor& f) const;

    Returns:

    true if this->target<Functor>() is non-NULL and function_equal(*(this->target<Functor>()), f)
  3. const std::type_info& target_type() const;

    Returns:

    typeid of the target function object, or typeid(void) if this->empty().

    Throws:

    Will not throw.

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