...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::functionN::sig — Lambda library support
// Lambda library supporttemplate<typename Args> struct sig { // types typedef result_type type; }; // specialized algorithms template<typename T1, typename T2, ..., typename TN, typename Allocator> void swap(functionN<T1, T2, ..., TN, Allocator>&, functionN<T1, T2, ..., TN, Allocator>&); // comparison operators template<typename T1, typename T2, ..., typename TN, typename Allocator, typename Functor> bool operator==(const functionN<T1, T2, ..., TN, Allocator>&, Functor); template<typename T1, typename T2, ..., typename TN, typename Allocator, typename Functor> bool operator==(Functor, const functionN<T1, T2, ..., TN, Allocator>&); template<typename T1, typename T2, ..., typename TN, typename Allocator, typename Functor> bool operator==(const functionN<T1, T2, ..., TN, Allocator>&, reference_wrapper<Functor>); template<typename T1, typename T2, ..., typename TN, typename Allocator, typename Functor> bool operator==(reference_wrapper<Functor>, const functionN<T1, T2, ..., TN, Allocator>&); template<typename T1, typename T2, ..., typename TN, typename Allocator1, typename U1, typename U2, ..., typename UN, typename Allocator2> void operator==(const functionN<T1, T2, ..., TN, Allocator1>&, const functionN<U1, U2, ..., UN, Allocator2>&); template<typename T1, typename T2, ..., typename TN, typename Allocator, typename Functor> bool operator!=(const functionN<T1, T2, ..., TN, Allocator>&, Functor); template<typename T1, typename T2, ..., typename TN, typename Allocator, typename Functor> bool operator!=(Functor, const functionN<T1, T2, ..., TN, Allocator>&); template<typename T1, typename T2, ..., typename TN, typename Allocator, typename Functor> bool operator!=(const functionN<T1, T2, ..., TN, Allocator>&, reference_wrapper<Functor>); template<typename T1, typename T2, ..., typename TN, typename Allocator, typename Functor> bool operator!=(reference_wrapper<Functor>, const functionN<T1, T2, ..., TN, Allocator>&); template<typename T1, typename T2, ..., typename TN, typename Allocator1, typename U1, typename U2, ..., typename UN, typename Allocator2> void operator!=(const functionN<T1, T2, ..., TN, Allocator1>&, const functionN<U1, U2, ..., UN, Allocator2>&);