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
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
A function object f is
compatible if for the given set of argument
types Arg1,
Arg2, ...,
ArgN and a
return type ResultType, the
appropriate following function is well-formed:
// if ResultType is not void ResultType foo(Arg1 arg1, Arg2 arg2, ..., ArgN argN) { return f(arg1, arg2, ..., argN); } // if ResultType is void ResultType foo(Arg1 arg1, Arg2 arg2, ..., ArgN argN) { f(arg1, arg2, ..., argN); }
A special provision is made for pointers to member
functions. Though they are not function objects, Boost.Function
will adapt them internally to function objects. This requires
that a pointer to member function of the form R
(X::*mf)(Arg1, Arg2, ..., ArgN)
cv-quals be adapted to a
function object with the following function call operator
overloads:
template<typename P> R operator()(cv-quals P& x, Arg1 arg1, Arg2 arg2, ..., ArgN argN) const { return (*x).*mf(arg1, arg2, ..., argN); }
A function object f of
type F is
stateless if it is a function pointer or if
boost::is_stateless<F>
is true. The construction of or copy to a Boost.Function object
from a stateless function object will not cause exceptions to be
thrown and will not allocate any storage.
namespace boost { class bad_function_call; class function_base; template<typename R, typename T1, typename T2, ..., typename TN> class functionN; template<typename T1, typename T2, ..., typename TN> void swap(functionN<T1, T2, ..., TN>&, functionN<T1, T2, ..., TN>&); template<typename T1, typename T2, ..., typename TN, typename Functor> bool operator==(const functionN<T1, T2, ..., TN>&, Functor); template<typename T1, typename T2, ..., typename TN, typename Functor> bool operator==(Functor, const functionN<T1, T2, ..., TN>&); template<typename T1, typename T2, ..., typename TN, typename Functor> bool operator==(const functionN<T1, T2, ..., TN>&, reference_wrapper<Functor>); template<typename T1, typename T2, ..., typename TN, typename Functor> bool operator==(reference_wrapper<Functor>, const functionN<T1, T2, ..., TN>&); template<typename T1, typename T2, ..., typename TN, typename U1, typename U2, ..., typename UN> void operator==(const functionN<T1, T2, ..., TN>&, const functionN<U1, U2, ..., UN>&); template<typename T1, typename T2, ..., typename TN, typename Functor> bool operator!=(const functionN<T1, T2, ..., TN>&, Functor); template<typename T1, typename T2, ..., typename TN, typename Functor> bool operator!=(Functor, const functionN<T1, T2, ..., TN>&); template<typename T1, typename T2, ..., typename TN, typename Functor> bool operator!=(const functionN<T1, T2, ..., TN>&, reference_wrapper<Functor>); template<typename T1, typename T2, ..., typename TN, typename Functor> bool operator!=(reference_wrapper<Functor>, const functionN<T1, T2, ..., TN>&); template<typename T1, typename T2, ..., typename TN, typename U1, typename U2, ..., typename UN> void operator!=(const functionN<T1, T2, ..., TN>&, const functionN<U1, U2, ..., UN>&); template<typename Signature> class function; template<typename Signature> void swap(function<Signature>&, function<Signature>&); template<typename Signature, typename Functor> bool operator==(const function<Signature>&, Functor); template<typename Signature, typename Functor> bool operator==(Functor, const function<Signature>&); template<typename Signature, typename Functor> bool operator==(const function<Signature>&, reference_wrapper<Functor>); template<typename Signature, typename Functor> bool operator==(reference_wrapper<Functor>, const function<Signature>&); template<typename Signature1, typename Signature2> void operator==(const function<Signature1>&, const function<Signature2>&); template<typename Signature, typename Functor> bool operator!=(const function<Signature>&, Functor); template<typename Signature, typename Functor> bool operator!=(Functor, const function<Signature>&); template<typename Signature, typename Functor> bool operator!=(const function<Signature>&, reference_wrapper<Functor>); template<typename Signature, typename Functor> bool operator!=(reference_wrapper<Functor>, const function<Signature>&); template<typename Signature1, typename Signature2> void operator!=(const function<Signature1>&, const function<Signature2>&); }
namespace boost { template<typename F, typename G> bool function_equal(const F&, const G&); }