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function.hpp:

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- Support Peter Dimov's rockin' new syntax:
      function<string (int x, double y, float z)> f;


[SVN r14531]
This commit is contained in:
Douglas Gregor
2002-07-19 18:30:48 +00:00
parent df34714340
commit 9e49833a8c
1 changed files with 332 additions and 51 deletions
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383
include/boost/function.hpp
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@ -20,6 +20,7 @@
#define BOOST_FUNCTION_HPP
#include <boost/function/function_base.hpp>
#include <boost/type_traits/function_traits.hpp>
#include <boost/function/function0.hpp>
#include <boost/function/function1.hpp>
#include <boost/function/function2.hpp>
@ -35,6 +36,217 @@
namespace boost {
namespace detail {
namespace function {
template<typename Signature>
struct function_traits
{
BOOST_STATIC_CONSTANT(int, arity = 0);
typedef void result_type;
typedef void arg1_type;
typedef void arg2_type;
typedef void arg3_type;
typedef void arg4_type;
typedef void arg5_type;
typedef void arg6_type;
typedef void arg7_type;
typedef void arg8_type;
typedef void arg9_type;
typedef void arg10_type;
};
template<typename R>
struct function_traits<R ()>
{
BOOST_STATIC_CONSTANT(int, arity = 0);
typedef R result_type;
typedef unusable arg1_type;
typedef unusable arg2_type;
typedef unusable arg3_type;
typedef unusable arg4_type;
typedef unusable arg5_type;
typedef unusable arg6_type;
typedef unusable arg7_type;
typedef unusable arg8_type;
typedef unusable arg9_type;
typedef unusable arg10_type;
};
template<typename R, typename T1>
struct function_traits<R (T1)>
{
BOOST_STATIC_CONSTANT(int, arity = 1);
typedef R result_type;
typedef T1 arg1_type;
typedef unusable arg2_type;
typedef unusable arg3_type;
typedef unusable arg4_type;
typedef unusable arg5_type;
typedef unusable arg6_type;
typedef unusable arg7_type;
typedef unusable arg8_type;
typedef unusable arg9_type;
typedef unusable arg10_type;
};
template<typename R, typename T1, typename T2>
struct function_traits<R (T1, T2)>
{
BOOST_STATIC_CONSTANT(int, arity = 2);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef unusable arg3_type;
typedef unusable arg4_type;
typedef unusable arg5_type;
typedef unusable arg6_type;
typedef unusable arg7_type;
typedef unusable arg8_type;
typedef unusable arg9_type;
typedef unusable arg10_type;
};
template<typename R, typename T1, typename T2, typename T3>
struct function_traits<R (T1, T2, T3)>
{
BOOST_STATIC_CONSTANT(int, arity = 3);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef unusable arg4_type;
typedef unusable arg5_type;
typedef unusable arg6_type;
typedef unusable arg7_type;
typedef unusable arg8_type;
typedef unusable arg9_type;
typedef unusable arg10_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4>
struct function_traits<R (T1, T2, T3, T4)>
{
BOOST_STATIC_CONSTANT(int, arity = 4);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef unusable arg5_type;
typedef unusable arg6_type;
typedef unusable arg7_type;
typedef unusable arg8_type;
typedef unusable arg9_type;
typedef unusable arg10_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5>
struct function_traits<R (T1, T2, T3, T4, T5)>
{
BOOST_STATIC_CONSTANT(int, arity = 5);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef unusable arg6_type;
typedef unusable arg7_type;
typedef unusable arg8_type;
typedef unusable arg9_type;
typedef unusable arg10_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6>
struct function_traits<R (T1, T2, T3, T4, T5, T6)>
{
BOOST_STATIC_CONSTANT(int, arity = 6);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef unusable arg7_type;
typedef unusable arg8_type;
typedef unusable arg9_type;
typedef unusable arg10_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7>
struct function_traits<R (T1, T2, T3, T4, T5, T6, T7)>
{
BOOST_STATIC_CONSTANT(int, arity = 7);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
typedef unusable arg8_type;
typedef unusable arg9_type;
typedef unusable arg10_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8>
struct function_traits<R (T1, T2, T3, T4, T5, T6, T7, T8)>
{
BOOST_STATIC_CONSTANT(int, arity = 8);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
typedef T8 arg8_type;
typedef unusable arg9_type;
typedef unusable arg10_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename T9>
struct function_traits<R (T1, T2, T3, T4, T5, T6, T7, T8, T9)>
{
BOOST_STATIC_CONSTANT(int, arity = 9);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
typedef T8 arg8_type;
typedef T9 arg9_type;
typedef unusable arg10_type;
};
template<typename R, typename T1, typename T2, typename T3, typename T4,
typename T5, typename T6, typename T7, typename T8, typename T9,
typename T10>
struct function_traits<R (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)>
{
BOOST_STATIC_CONSTANT(int, arity = 10);
typedef R result_type;
typedef T1 arg1_type;
typedef T2 arg2_type;
typedef T3 arg3_type;
typedef T4 arg4_type;
typedef T5 arg5_type;
typedef T6 arg6_type;
typedef T7 arg7_type;
typedef T8 arg8_type;
typedef T9 arg9_type;
typedef T10 arg10_type;
};
// Choose the appropriate underlying implementation
template<int Args> struct real_get_function_impl {};
@ -320,23 +532,73 @@ namespace boost {
};
template<
typename R,
typename T1,
typename T2,
typename T3,
typename T4,
typename T5,
typename T6,
typename T7,
typename T8,
typename T9,
typename T10,
typename Policy = empty_function_policy,
typename Mixin = empty_function_mixin,
typename Allocator = std::allocator<function_base>
typename InR,
typename InT1,
typename InT2,
typename InT3,
typename InT4,
typename InT5,
typename InT6,
typename InT7,
typename InT8,
typename InT9,
typename InT10,
typename InPolicy = empty_function_policy,
typename InMixin = empty_function_mixin,
typename InAllocator = std::allocator<function_base>
>
struct get_function_impl
class get_function_impl
{
BOOST_STATIC_CONSTANT(bool, encoded_param = is_function<InR>::value);
typedef function_traits<InR> traits;
public:
typedef typename ct_if<encoded_param,
typename traits::result_type,
InR>::type R;
typedef typename ct_if<encoded_param,
typename traits::arg1_type,
InT1>::type T1;
typedef typename ct_if<encoded_param,
typename traits::arg2_type,
InT2>::type T2;
typedef typename ct_if<encoded_param,
typename traits::arg3_type,
InT3>::type T3;
typedef typename ct_if<encoded_param,
typename traits::arg4_type,
InT4>::type T4;
typedef typename ct_if<encoded_param,
typename traits::arg5_type,
InT5>::type T5;
typedef typename ct_if<encoded_param,
typename traits::arg6_type,
InT6>::type T6;
typedef typename ct_if<encoded_param,
typename traits::arg7_type,
InT7>::type T7;
typedef typename ct_if<encoded_param,
typename traits::arg8_type,
InT8>::type T8;
typedef typename ct_if<encoded_param,
typename traits::arg9_type,
InT9>::type T9;
typedef typename ct_if<encoded_param,
typename traits::arg10_type,
InT10>::type T10;
typedef typename ct_if<(encoded_param &&
!is_same<InT1, unusable>::value),
InT1,
InPolicy>::type Policy;
typedef typename ct_if<(encoded_param &&
!is_same<InT2, unusable>::value),
InT2,
InMixin>::type Mixin;
typedef typename ct_if<(encoded_param &&
!is_same<InT3, unusable>::value),
InT3,
InAllocator>::type Allocator;
typedef typename real_get_function_impl<
(count_used_args<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10>::value)
>::template params<R, T1, T2, T3, T4, T5, T6, T7, T8, T9, T10,
@ -345,28 +607,45 @@ namespace boost {
};
template<
typename R,
typename T1,
typename T2,
typename T3,
typename T4,
typename T5,
typename T6,
typename T7,
typename T8,
typename T9,
typename T10,
typename MyPolicy = empty_function_policy,
typename MyMixin = empty_function_mixin,
typename MyAllocator = std::allocator<function_base>
typename InR,
typename InT1,
typename InT2,
typename InT3,
typename InT4,
typename InT5,
typename InT6,
typename InT7,
typename InT8,
typename InT9,
typename InT10,
typename InMyPolicy = empty_function_policy,
typename InMyMixin = empty_function_mixin,
typename InMyAllocator = std::allocator<function_base>
>
struct function_traits_builder
class function_traits_builder
{
typedef typename get_function_impl<R, T1, T2, T3, T4, T5, T6, T7,
T8, T9, T10, MyPolicy, MyMixin,
MyAllocator>::type
type;
typedef get_function_impl<InR, InT1, InT2, InT3, InT4, InT5, InT6, InT7,
InT8, InT9, InT10, InMyPolicy, InMyMixin,
InMyAllocator>
impl;
typedef typename impl::R MyR;
typedef typename impl::T1 MyT1;
typedef typename impl::T2 MyT2;
typedef typename impl::T3 MyT3;
typedef typename impl::T4 MyT4;
typedef typename impl::T5 MyT5;
typedef typename impl::T6 MyT6;
typedef typename impl::T7 MyT7;
typedef typename impl::T8 MyT8;
typedef typename impl::T9 MyT9;
typedef typename impl::T10 MyT10;
typedef typename impl::Policy MyPolicy;
typedef typename impl::Mixin MyMixin;
typedef typename impl::Allocator MyAllocator;
public:
typedef typename impl::type type;
typedef MyPolicy policy_type;
typedef MyMixin mixin_type;
typedef MyAllocator allocator_type;
@ -374,28 +653,28 @@ namespace boost {
#ifndef BOOST_NO_DEPENDENT_NESTED_DERIVATIONS
template<typename Policy>
struct policy :
public function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7, T8, T9,
T10, Policy, mixin_type,
allocator_type> {};
public function_traits_builder<MyR, MyT1, MyT2, MyT3, MyT4, MyT5, MyT6,
MyT7, MyT8, MyT9, MyT10, Policy,
mixin_type, allocator_type> {};
template<typename Mixin>
struct mixin :
public function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7, T8, T9,
T10, policy_type, Mixin,
allocator_type> {};
public function_traits_builder<MyR, MyT1, MyT2, MyT3, MyT4, MyT5, MyT6,
MyT7, MyT8, MyT9, MyT10, policy_type,
Mixin, allocator_type> {};
template<typename Allocator>
struct allocator :
public function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7, T8, T9,
T10, policy_type, mixin_type,
Allocator> {};
public function_traits_builder<MyR, MyT1, MyT2, MyT3, MyT4, MyT5, MyT6,
MyT7, MyT8, MyT9, MyT10, policy_type,
mixin_type, Allocator> {};
#else
template<typename Policy>
struct policy
{
typedef typename function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7,
T8, T9, T10, Policy,
mixin_type,
typedef typename function_traits_builder<MyR, MyT1, MyT2, MyT3, MyT4,
MyT5, MyT6, MyT7, MyT8, MyT9,
MyT10, Policy, mixin_type,
allocator_type>::type
type;
};
@ -403,8 +682,9 @@ namespace boost {
template<typename Mixin>
struct mixin
{
typedef typename function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7,
T8, T9, T10, policy_type, Mixin,
typedef typename function_traits_builder<MyR, MyT1, MyT2, MyT3, MyT4,
MyT5, MyT6, MyT7, MyT8, MyT9,
MyT10, policy_type, Mixin,
allocator_type>::type
type;
};
@ -412,9 +692,10 @@ namespace boost {
template<typename Allocator>
struct allocator
{
typedef typename function_traits_builder<R, T1, T2, T3, T4, T5, T6, T7,
T8, T9, T10, policy_type,
mixin_type, Allocator>::type
typedef typename function_traits_builder<MyR, MyT1, MyT2, MyT3, MyT4,
MyT5, MyT6, MyT7, MyT8, MyT9,
MyT10, policy_type, mixin_type,
Allocator>::type
type;
};
#endif