Struct template sig

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## Struct template sig

boost::function::sig — Lambda library support

## Synopsis

    // Lambda library supporttemplate<typename Args>
    struct sig {
      // types
      typedef result_type type;
    };

    // specialized algorithms
    template<typename Signature, typename Allocator>
      void swap(function<Signature, Allocator>&, function<Signature, Allocator>&);

    // comparison operators
    template<typename Signature, typename Allocator, typename Functor>
      bool operator==(const function<Signature, Allocator>&, Functor);
    template<typename Signature, typename Allocator, typename Functor>
      bool operator==(Functor, const function<Signature, Allocator>&);
    template<typename Signature, typename Allocator, typename Functor>
      bool operator==(const function<Signature, Allocator>&,
                      reference_wrapper<Functor>);
    template<typename Signature, typename Allocator, typename Functor>
      bool operator==(reference_wrapper<Functor>,
                      const function<Signature, Allocator>&);
    template<typename Signature1, typename Allocator1, typename Signature2,
             typename Allocator2>
      void operator==(const function<Signature1, Allocator1>&,
                      const function<Signature2, Allocator2>&);
    template<typename Signature, typename Allocator, typename Functor>
      bool operator!=(const function<Signature, Allocator>&, Functor);
    template<typename Signature, typename Allocator, typename Functor>
      bool operator!=(Functor, const function<Signature, Allocator>&);
    template<typename Signature, typename Allocator, typename Functor>
      bool operator!=(const function<Signature, Allocator>&,
                      reference_wrapper<Functor>);
    template<typename Signature, typename Allocator, typename Functor>
      bool operator!=(reference_wrapper<Functor>,
                      const function<Signature, Allocator>&);
    template<typename Signature1, typename Allocator1, typename Signature2,
             typename Allocator2>
      void operator!=(const function<Signature1, Allocator1>&,
                      const function<Signature2, Allocator2>&);