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Added variadic support

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Improves `boost/function.hpp` inclusion by 20%.
This commit is contained in:
Nikita Kniazev
2018-10-18 21:44:22 +03:00
committed by James E. King III
parent 5f93559650
commit f22fa49e07
4 changed files with 99 additions and 4 deletions
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70
include/boost/function/function_template.hpp
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@ -18,6 +18,39 @@
# pragma warning( disable : 4127 ) // "conditional expression is constant"
#endif
#ifndef BOOST_FUNCTION_NO_VARIADIC
#define BOOST_FUNCTION_TEMPLATE_PARMS typename... T
#define BOOST_FUNCTION_TEMPLATE_ARGS T...
#define BOOST_FUNCTION_PARMS T... a
#ifdef BOOST_NO_CXX11_RVALUE_REFERENCES
# define BOOST_FUNCTION_ARGS a...
#else
# define BOOST_FUNCTION_ARGS static_cast<T&&>(a)...
#endif
// Always have commas (zero args case is handled with variadics too)
#define BOOST_FUNCTION_COMMA ,
// Class names used in this version of the code
#define BOOST_FUNCTION_FUNCTION function_n
#define BOOST_FUNCTION_FUNCTION_INVOKER function_invoker
#define BOOST_FUNCTION_VOID_FUNCTION_INVOKER void_function_invoker
#define BOOST_FUNCTION_FUNCTION_OBJ_INVOKER function_obj_invoker
#define BOOST_FUNCTION_VOID_FUNCTION_OBJ_INVOKER void_function_obj_invoker
#define BOOST_FUNCTION_FUNCTION_REF_INVOKER function_ref_invoker
#define BOOST_FUNCTION_VOID_FUNCTION_REF_INVOKER void_function_ref_invoker
#define BOOST_FUNCTION_MEMBER_INVOKER function_mem_invoker
#define BOOST_FUNCTION_VOID_MEMBER_INVOKER function_void_mem_invoker
#define BOOST_FUNCTION_GET_FUNCTION_INVOKER get_function_invoker
#define BOOST_FUNCTION_GET_FUNCTION_OBJ_INVOKER get_function_obj_invoker
#define BOOST_FUNCTION_GET_FUNCTION_REF_INVOKER get_function_ref_invoker
#define BOOST_FUNCTION_GET_MEMBER_INVOKER get_member_invoker
#define BOOST_FUNCTION_GET_INVOKER get_invoker
#define BOOST_FUNCTION_VTABLE basic_vtable
#else // BOOST_FUNCTION_NO_VARIADIC
#define BOOST_FUNCTION_TEMPLATE_PARMS BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS, typename T)
#define BOOST_FUNCTION_TEMPLATE_ARGS BOOST_PP_ENUM_PARAMS(BOOST_FUNCTION_NUM_ARGS, T)
@ -75,6 +108,8 @@
BOOST_JOIN(get_invoker,BOOST_FUNCTION_NUM_ARGS)
#define BOOST_FUNCTION_VTABLE BOOST_JOIN(basic_vtable,BOOST_FUNCTION_NUM_ARGS)
#endif // BOOST_FUNCTION_NO_VARIADIC
#ifndef BOOST_NO_VOID_RETURNS
# define BOOST_FUNCTION_VOID_RETURN_TYPE void
# define BOOST_FUNCTION_RETURN(X) X
@ -652,6 +687,26 @@ namespace boost {
vtable_base base;
invoker_type invoker;
};
#ifndef BOOST_FUNCTION_NO_VARIADIC
template <typename... T>
struct variadic_function_base
{};
template <typename T>
struct variadic_function_base<T>
{
typedef T argument_type;
};
template <typename T0, typename T1>
struct variadic_function_base<T0, T1>
{
typedef T0 first_argument_type;
typedef T1 second_argument_type;
};
#endif
} // end namespace function
} // end namespace detail
@ -660,6 +715,9 @@ namespace boost {
BOOST_FUNCTION_TEMPLATE_PARMS
>
class BOOST_FUNCTION_FUNCTION : public function_base
#ifndef BOOST_FUNCTION_NO_VARIADIC
, public detail::function::variadic_function_base<T...>
#endif
{
public:
#ifndef BOOST_NO_VOID_RETURNS
@ -682,8 +740,6 @@ namespace boost {
struct clear_type {};
public:
BOOST_STATIC_CONSTANT(int, args = BOOST_FUNCTION_NUM_ARGS);
// add signature for boost::lambda
template<typename Args>
struct sig
@ -691,6 +747,13 @@ namespace boost {
typedef result_type type;
};
#ifndef BOOST_FUNCTION_NO_VARIADIC
static int const args = sizeof...(T);
static int const arity = sizeof...(T);
#else
#if BOOST_FUNCTION_NUM_ARGS == 1
typedef T0 argument_type;
#elif BOOST_FUNCTION_NUM_ARGS == 2
@ -698,9 +761,12 @@ namespace boost {
typedef T1 second_argument_type;
#endif
BOOST_STATIC_CONSTANT(int, args = BOOST_FUNCTION_NUM_ARGS);
BOOST_STATIC_CONSTANT(int, arity = BOOST_FUNCTION_NUM_ARGS);
BOOST_FUNCTION_ARG_TYPES
#endif
typedef BOOST_FUNCTION_FUNCTION self_type;
BOOST_DEFAULTED_FUNCTION(BOOST_FUNCTION_FUNCTION(), : function_base() {})