ChaiScript/include/chaiscript/dispatchkit/function_signature.hpp

#ifndef CHAISCRIPT_FUNCTION_SIGNATURE_HPP
#define CHAISCRIPT_FUNCTION_SIGNATURE_HPP

#include <type_traits>

namespace chaiscript::dispatch::detail {
  template<typename ... Param>
    struct Function_Params
    {
    };

  template<typename Ret, typename Params, bool IsNoExcept = false, bool IsMember = false, bool IsMemberObject = false, bool IsObject = false>
    struct Function_Signature {
      using Param_Types = Params;
      using Return_Type = Ret;
      constexpr static const bool is_object = IsObject;
      constexpr static const bool is_member_object = IsMemberObject;
      constexpr static const bool is_noexcept = IsNoExcept;
      template<typename T>
        constexpr Function_Signature(T &&) noexcept {}
      constexpr Function_Signature() noexcept = default;
    };

  // Free functions

  template<typename Ret, typename ... Param>
    Function_Signature(Ret (*f)(Param...)) -> Function_Signature<Ret, Function_Params<Param...>>;

  template<typename Ret, typename ... Param>
    Function_Signature(Ret (*f)(Param...) noexcept) -> Function_Signature<Ret, Function_Params<Param...>, true>;

  // no reference specifier

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile) -> Function_Signature<Ret, Function_Params<volatile Class &, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile noexcept) -> Function_Signature<Ret, Function_Params<volatile Class &, Param...>, true, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile const) -> Function_Signature<Ret, Function_Params<volatile const Class &, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile const noexcept) -> Function_Signature<Ret, Function_Params<volatile const Class &, Param...>, true, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) ) -> Function_Signature<Ret, Function_Params<Class &, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) noexcept) -> Function_Signature<Ret, Function_Params<Class &, Param...>, true, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) const) -> Function_Signature<Ret, Function_Params<const Class &, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) const noexcept) -> Function_Signature<Ret, Function_Params<const Class &, Param...>, true, true>;

  // & reference specifier

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile &) -> Function_Signature<Ret, Function_Params<volatile Class &, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile & noexcept) -> Function_Signature<Ret, Function_Params<volatile Class &, Param...>, true, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile const &) -> Function_Signature<Ret, Function_Params<volatile const Class &, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile const & noexcept) -> Function_Signature<Ret, Function_Params<volatile const Class &, Param...>, true, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) & ) -> Function_Signature<Ret, Function_Params<Class &, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) & noexcept) -> Function_Signature<Ret, Function_Params<Class &, Param...>, true, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) const &) -> Function_Signature<Ret, Function_Params<const Class &, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) const & noexcept) -> Function_Signature<Ret, Function_Params<const Class &, Param...>, true, true>;

  // && reference specifier

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile &&) -> Function_Signature<Ret, Function_Params<volatile Class &&, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile && noexcept) -> Function_Signature<Ret, Function_Params<volatile Class &&, Param...>, true, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile const &&) -> Function_Signature<Ret, Function_Params<volatile const Class &&, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) volatile const && noexcept) -> Function_Signature<Ret, Function_Params<volatile const Class &&, Param...>, true, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) &&) -> Function_Signature<Ret, Function_Params<Class &&, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) && noexcept) -> Function_Signature<Ret, Function_Params<Class &&, Param...>, true, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) const &&) -> Function_Signature<Ret, Function_Params<const Class &&, Param...>, false, true>;

  template<typename Ret, typename Class, typename ... Param>
    Function_Signature(Ret (Class::*f)(Param ...) const && noexcept) -> Function_Signature<Ret, Function_Params<const Class &&, Param...>, true, true>;

  template<typename Ret, typename Class>
    Function_Signature(Ret (Class::*f)) -> Function_Signature<Ret, Function_Params<Class &>, true, true, true>;

  template<typename Func>
    Function_Signature(Func &&) -> Function_Signature<
    typename decltype(Function_Signature{&std::decay_t<Func>::operator()})::Return_Type,
             typename decltype(Function_Signature{&std::decay_t<Func>::operator()})::Param_Types,
             decltype(Function_Signature{&std::decay_t<Func>::operator()})::is_noexcept,
             false,
             false,
             true
               >;
}

#endif