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gcc/libstdc++-v3/include/tr1/functional_iterate.h
Douglas Gregor ca6ca8fa9c functional (_Maybe_wrap_member_pointer): Wrap up member pointers in _Mem_fn but let other function objects pass through... 
2005-04-01  Douglas Gregor  <doug.gregor@gmail.com>

	* include/tr1/functional (_Maybe_wrap_member_pointer): Wrap up
	member pointers in _Mem_fn but let other function objects pass
	through unchanged.
	* include/tr1/functional_iterator (bind): Reduce number of bind()
	overloads to two to eliminate ambiguities. Use
	_Maybe_wrap_member_pointer to handle member pointers gracefully.

From-SVN: r97428
2005-04-02 02:02:29 +00:00

924 lines
27 KiB
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// TR1 functional -*- C++ -*-
// Copyright (C) 2005 Free Software Foundation, Inc.
// Written by Douglas Gregor <doug.gregor -at- gmail.com>
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 2, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING. If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
// As a special exception, you may use this file as part of a free software
// library without restriction. Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License. This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.
/** @file functional_iterate.h
* This is an internal header file, included by other library headers.
* You should not attempt to use it directly.
*/
template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
struct _Weak_result_type_impl<_Res(_GLIBCXX_TEMPLATE_ARGS)>
{
typedef _Res result_type;
};
template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
struct _Weak_result_type_impl<_Res (&)(_GLIBCXX_TEMPLATE_ARGS)>
{
typedef _Res result_type;
};
template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
struct _Weak_result_type_impl<_Res (*)(_GLIBCXX_TEMPLATE_ARGS)>
{
typedef _Res result_type;
};
#if _GLIBCXX_NUM_ARGS > 0
template<typename _Res, typename _Class _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_TEMPLATE_PARAMS_SHIFTED>
struct _Weak_result_type_impl<
_Res (_Class::*)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED)>
{
typedef _Res result_type;
};
template<typename _Res, typename _Class _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_TEMPLATE_PARAMS_SHIFTED>
struct _Weak_result_type_impl<
_Res (_Class::*)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED) const>
{
typedef _Res result_type;
};
template<typename _Res, typename _Class _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_TEMPLATE_PARAMS_SHIFTED>
struct _Weak_result_type_impl<
_Res (_Class::*)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED) volatile>
{
typedef _Res result_type;
};
template<typename _Res, typename _Class _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_TEMPLATE_PARAMS_SHIFTED>
struct _Weak_result_type_impl<
_Res (_Class::*)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED) const volatile>
{
typedef _Res result_type;
};
#endif
template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class result_of<_Functor(_GLIBCXX_TEMPLATE_ARGS)>
: public _Result_of_impl<
_Has_result_type<_Weak_result_type<_Functor> >::value,
_Functor(_GLIBCXX_TEMPLATE_ARGS)>
{ };
template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
struct _Result_of_impl<true, _Functor(_GLIBCXX_TEMPLATE_ARGS)>
{
typedef typename _Weak_result_type<_Functor>::result_type type;
};
template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
struct _Result_of_impl<false, _Functor(_GLIBCXX_TEMPLATE_ARGS)>
{
#if _GLIBCXX_NUM_ARGS > 0
typedef typename _Functor
::template result<_Functor(_GLIBCXX_TEMPLATE_ARGS)>::type type;
#else
typedef void type;
#endif
};
/**
* @if maint
* Invoke a function object, which may be either a member pointer or a
* function object. The first parameter will tell which.
* @endif
*/
template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
inline
typename __enable_if<
typename result_of<_Functor(_GLIBCXX_TEMPLATE_ARGS)>::type,
(!is_member_pointer<_Functor>::value
&& !is_function<_Functor>::value
&& !is_function<typename remove_pointer<_Functor>::type>::value)
>::__type
__invoke(_Functor& __f _GLIBCXX_COMMA _GLIBCXX_REF_PARAMS)
{
return __f(_GLIBCXX_ARGS);
}
#if _GLIBCXX_NUM_ARGS > 0
template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
inline
typename __enable_if<
typename result_of<_Functor(_GLIBCXX_TEMPLATE_ARGS)>::type,
(is_member_pointer<_Functor>::value
&& !is_function<_Functor>::value
&& !is_function<typename remove_pointer<_Functor>::type>::value)
>::__type
__invoke(_Functor& __f _GLIBCXX_COMMA _GLIBCXX_REF_PARAMS)
{
return mem_fn(__f)(_GLIBCXX_ARGS);
}
#endif
// To pick up function references (that will become function pointers)
template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
inline
typename __enable_if<
typename result_of<_Functor(_GLIBCXX_TEMPLATE_ARGS)>::type,
(is_pointer<_Functor>::value
&& is_function<typename remove_pointer<_Functor>::type>::value)
>::__type
__invoke(_Functor __f _GLIBCXX_COMMA _GLIBCXX_REF_PARAMS)
{
return __f(_GLIBCXX_ARGS);
}
/**
* @if maint
* Implementation of reference_wrapper::operator()
* @endif
*/
#if _GLIBCXX_NUM_ARGS > 0
template<typename _Tp>
template<_GLIBCXX_TEMPLATE_PARAMS>
typename result_of<
typename reference_wrapper<_Tp>::_M_func_type(_GLIBCXX_TEMPLATE_ARGS)>::type
reference_wrapper<_Tp>::operator()(_GLIBCXX_REF_PARAMS) const
{
return __invoke(get(), _GLIBCXX_ARGS);
}
#endif
#if _GLIBCXX_NUM_ARGS > 0
template<typename _Res, typename _Class _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_TEMPLATE_PARAMS_SHIFTED>
class _Mem_fn<_Res (_Class::*)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED)>
#if _GLIBCXX_NUM_ARGS == 1
: public unary_function<_Class*, _Res>
#elif _GLIBCXX_NUM_ARGS == 2
: public binary_function<_Class*, _T1, _Res>
#endif
{
typedef _Res (_Class::*_Functor)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED);
template<typename _Tp>
_Res
_M_call(_Tp& __object, const volatile _Class * _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object.*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
template<typename _Tp>
_Res
_M_call(_Tp& __ptr, const volatile void * _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return ((*__ptr).*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
_Res
operator()(_Class& __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object.*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
// Handle pointers
_Res
operator()(_Class* __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object->*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp>
_Res
operator()(_Tp& __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{
return _M_call(__object, &__object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_ARGS_SHIFTED);
}
private:
_Functor __pmf;
};
template<typename _Res, typename _Class _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_TEMPLATE_PARAMS_SHIFTED>
class _Mem_fn<_Res (_Class::*)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED) const>
#if _GLIBCXX_NUM_ARGS == 1
: public unary_function<const _Class*, _Res>
#elif _GLIBCXX_NUM_ARGS == 2
: public binary_function<const _Class*, _T1, _Res>
#endif
{
typedef _Res (_Class::*_Functor)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED) const;
template<typename _Tp>
_Res
_M_call(_Tp& __object, const volatile _Class * _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object.*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
template<typename _Tp>
_Res
_M_call(_Tp& __ptr, const volatile void * _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return ((*__ptr).*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
_Res
operator()(const _Class& __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object.*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
// Handle pointers
_Res
operator()(const _Class* __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object->*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp>
_Res
operator()(_Tp& __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{
return _M_call(__object, &__object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_ARGS_SHIFTED);
}
private:
_Functor __pmf;
};
template<typename _Res, typename _Class _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_TEMPLATE_PARAMS_SHIFTED>
class _Mem_fn<_Res (_Class::*)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED) volatile>
#if _GLIBCXX_NUM_ARGS == 1
: public unary_function<volatile _Class*, _Res>
#elif _GLIBCXX_NUM_ARGS == 2
: public binary_function<volatile _Class*, _T1, _Res>
#endif
{
typedef _Res (_Class::*_Functor)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED) volatile;
template<typename _Tp>
_Res
_M_call(_Tp& __object, const volatile _Class * _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object.*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
template<typename _Tp>
_Res
_M_call(_Tp& __ptr, const volatile void * _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return ((*__ptr).*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
_Res
operator()(volatile _Class& __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object.*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
// Handle pointers
_Res
operator()(volatile _Class* __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object->*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp>
_Res
operator()(_Tp& __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{
return _M_call(__object, &__object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_ARGS_SHIFTED);
}
private:
_Functor __pmf;
};
template<typename _Res, typename _Class _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_TEMPLATE_PARAMS_SHIFTED>
class _Mem_fn<_Res(_Class::*)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED) const volatile>
#if _GLIBCXX_NUM_ARGS == 1
: public unary_function<const volatile _Class*, _Res>
#elif _GLIBCXX_NUM_ARGS == 2
: public binary_function<const volatile _Class*, _T1, _Res>
#endif
{
typedef _Res (_Class::*_Functor)(_GLIBCXX_TEMPLATE_ARGS_SHIFTED)
const volatile;
template<typename _Tp>
_Res
_M_call(_Tp& __object, const volatile _Class * _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object.*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
template<typename _Tp>
_Res
_M_call(_Tp& __ptr, const volatile void * _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return ((*__ptr).*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
_Res
operator()(const volatile _Class& __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object.*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
// Handle pointers
_Res
operator()(const volatile _Class* __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{ return (__object->*__pmf)(_GLIBCXX_ARGS_SHIFTED); }
// Handle smart pointers, references and pointers to derived
template<typename _Tp>
_Res
operator()(_Tp& __object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_PARAMS_SHIFTED) const
{
return _M_call(__object, &__object _GLIBCXX_COMMA_SHIFTED
_GLIBCXX_ARGS_SHIFTED);
}
private:
_Functor __pmf;
};
#endif
#if _GLIBCXX_NUM_ARGS > 0
namespace placeholders
{
namespace
{
_Placeholder<_GLIBCXX_NUM_ARGS> _GLIBCXX_JOIN(_,_GLIBCXX_NUM_ARGS);
}
}
#endif
template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class _Bind<_Functor(_GLIBCXX_TEMPLATE_ARGS)>
: public _Weak_result_type<_Functor>
{
typedef _Bind __self_type;
_Functor _M_f;
_GLIBCXX_BIND_MEMBERS
public:
#if _GLIBCXX_NUM_ARGS == 0
explicit
#endif
_Bind(_Functor __f _GLIBCXX_COMMA _GLIBCXX_PARAMS)
: _M_f(__f) _GLIBCXX_COMMA _GLIBCXX_BIND_MEMBERS_INIT { }
#define _GLIBCXX_BIND_REPEAT_HEADER <tr1/bind_iterate.h>
#include <tr1/bind_repeat.h>
#undef _GLIBCXX_BIND_REPEAT_HEADER
};
template<typename _Result, typename _Functor
_GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class _Bind_result<_Result, _Functor(_GLIBCXX_TEMPLATE_ARGS)>
{
_Functor _M_f;
_GLIBCXX_BIND_MEMBERS
public:
typedef _Result result_type;
#if _GLIBCXX_NUM_ARGS == 0
explicit
#endif
_Bind_result(_Functor __f _GLIBCXX_COMMA _GLIBCXX_PARAMS)
: _M_f(__f) _GLIBCXX_COMMA _GLIBCXX_BIND_MEMBERS_INIT { }
#define _GLIBCXX_BIND_REPEAT_HEADER <tr1/bind_iterate.h>
#define _GLIBCXX_BIND_HAS_RESULT_TYPE
#include <tr1/bind_repeat.h>
#undef _GLIBCXX_BIND_HAS_RESULT_TYPE
#undef _GLIBCXX_BIND_REPEAT_HEADER
};
// Handle arbitrary function objects
template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
inline
_Bind<typename _Maybe_wrap_member_pointer<_Functor>::type
(_GLIBCXX_TEMPLATE_ARGS)>
bind(_Functor __f _GLIBCXX_COMMA _GLIBCXX_PARAMS)
{
typedef _Maybe_wrap_member_pointer<_Functor> __maybe_type;
typedef typename __maybe_type::type __functor_type;
typedef _Bind<__functor_type(_GLIBCXX_TEMPLATE_ARGS)> __result_type;
return __result_type(__maybe_type::__do_wrap(__f)
_GLIBCXX_COMMA _GLIBCXX_ARGS);
}
template<typename _Result, typename _Functor
_GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
inline
_Bind_result<_Result,
typename _Maybe_wrap_member_pointer<_Functor>::type
(_GLIBCXX_TEMPLATE_ARGS)>
bind(_Functor __f _GLIBCXX_COMMA _GLIBCXX_PARAMS)
{
typedef _Maybe_wrap_member_pointer<_Functor> __maybe_type;
typedef typename __maybe_type::type __functor_type;
typedef _Bind_result<_Result, __functor_type(_GLIBCXX_TEMPLATE_ARGS)>
__result_type;
return __result_type(__maybe_type::__do_wrap(__f)
_GLIBCXX_COMMA _GLIBCXX_ARGS);
}
template<typename _Res, typename _Functor _GLIBCXX_COMMA
_GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<_Res(_GLIBCXX_TEMPLATE_ARGS), _Functor>
: public _Function_base::_Base_manager<_Functor>
{
typedef _Function_base::_Base_manager<_Functor> _Base;
public:
static _Res
_M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
{
return (*_Base::_M_get_pointer(__functor))(_GLIBCXX_ARGS);
}
};
template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<void(_GLIBCXX_TEMPLATE_ARGS), _Functor>
: public _Function_base::_Base_manager<_Functor>
{
typedef _Function_base::_Base_manager<_Functor> _Base;
public:
static void
_M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
{
(*_Base::_M_get_pointer(__functor))(_GLIBCXX_ARGS);
}
};
template<typename _Res, typename _Functor _GLIBCXX_COMMA
_GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<_Res(_GLIBCXX_TEMPLATE_ARGS),
reference_wrapper<_Functor> >
: public _Function_base::_Ref_manager<_Functor>
{
typedef _Function_base::_Ref_manager<_Functor> _Base;
public:
static _Res
_M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
{
return __callable_functor(**_Base::_M_get_pointer(__functor))
(_GLIBCXX_ARGS);
}
};
template<typename _Functor _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<void(_GLIBCXX_TEMPLATE_ARGS),
reference_wrapper<_Functor> >
: public _Function_base::_Ref_manager<_Functor>
{
typedef _Function_base::_Ref_manager<_Functor> _Base;
public:
static void
_M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
{
__callable_functor(**_Base::_M_get_pointer(__functor))(_GLIBCXX_ARGS);
}
};
template<typename _Class, typename _Member, typename _Res
_GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<_Res(_GLIBCXX_TEMPLATE_ARGS), _Member _Class::*>
: public _Function_handler<void(_GLIBCXX_TEMPLATE_ARGS), _Member _Class::*>
{
typedef _Function_handler<void(_GLIBCXX_TEMPLATE_ARGS), _Member _Class::*>
_Base;
public:
static _Res
_M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
{
return std::tr1::mem_fn(_Base::_M_get_pointer(__functor)->__value)
(_GLIBCXX_ARGS);
}
};
template<typename _Class, typename _Member
_GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class _Function_handler<void(_GLIBCXX_TEMPLATE_ARGS), _Member _Class::*>
: public _Function_base::_Base_manager<
_Simple_type_wrapper< _Member _Class::* > >
{
typedef _Member _Class::* _Functor;
typedef _Simple_type_wrapper< _Functor > _Wrapper;
typedef _Function_base::_Base_manager<_Wrapper> _Base;
public:
static bool
_M_manager(_Any_data& __dest, const _Any_data& __source,
_Manager_operation __op)
{
switch (__op) {
case __get_type_info:
__dest._M_access<const type_info*>() = &typeid(_Functor);
break;
case __get_functor_ptr:
__dest._M_access<_Functor*>() =
&_Base::_M_get_pointer(__source)->__value;
break;
default:
_Base::_M_manager(__dest, __source, __op);
}
return false;
}
static void
_M_invoke(const _Any_data& __functor _GLIBCXX_COMMA _GLIBCXX_PARAMS)
{
std::tr1::mem_fn(_Base::_M_get_pointer(__functor)->__value)
(_GLIBCXX_ARGS);
}
};
template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
class function<_Res(_GLIBCXX_TEMPLATE_ARGS)>
#if _GLIBCXX_NUM_ARGS == 1
: public unary_function<_T1, _Res>, private _Function_base
#elif _GLIBCXX_NUM_ARGS == 2
: public binary_function<_T1, _T2, _Res>, private _Function_base
#else
: private _Function_base
#endif
{
/**
* @if maint
* This class is used to implement the safe_bool idiom.
* @endif
*/
struct _Hidden_type
{
_Hidden_type* _M_bool;
};
/**
* @if maint
* This typedef is used to implement the safe_bool idiom.
* @endif
*/
typedef _Hidden_type* _Hidden_type::* _Safe_bool;
typedef _Res _Signature_type(_GLIBCXX_TEMPLATE_ARGS);
struct _Useless {};
public:
typedef _Res result_type;
// [3.7.2.1] construct/copy/destroy
/**
* @brief Default construct creates an empty function call wrapper.
* @post @c !(bool)*this
*/
function() : _Function_base() { }
/**
* @brief Default construct creates an empty function call wrapper.
* @post @c !(bool)*this
*/
function(_M_clear_type*) : _Function_base() { }
/**
* @brief %Function copy constructor.
* @param x A %function object with identical call signature.
* @pre @c (bool)*this == (bool)x
*
* The newly-created %function contains a copy of the target of @a
* x (if it has one).
*/
function(const function& __x);
/**
* @brief Builds a %function that targets a copy of the incoming
* function object.
* @param f A %function object that is callable with parameters of
* type @c T1, @c T2, ..., @c TN and returns a value convertible
* to @c Res.
*
* The newly-created %function object will target a copy of @a
* f. If @a f is @c reference_wrapper<F>, then this function
* object will contain a reference to the function object @c
* f.get(). If @a f is a NULL function pointer or NULL
* pointer-to-member, the newly-created object will be empty.
*
* If @a f is a non-NULL function pointer or an object of type @c
* reference_wrapper<F>, this function will not throw.
*/
template<typename _Functor>
function(_Functor __f,
typename __enable_if<_Useless,
!is_integral<_Functor>::value>::__type
= _Useless());
/**
* @brief %Function assignment operator.
* @param x A %function with identical call signature.
* @post @c (bool)*this == (bool)x
* @returns @c *this
*
* The target of @a x is copied to @c *this. If @a x has no
* target, then @c *this will be empty.
*
* If @a x targets a function pointer or a reference to a function
* object, then this operation will not throw an exception.
*/
function& operator=(const function& __x)
{
function(__x).swap(*this);
return *this;
}
/**
* @brief %Function assignment to zero.
* @post @c !(bool)*this
* @returns @c *this
*
* The target of @a *this is deallocated, leaving it empty.
*/
function& operator=(_M_clear_type*)
{
if (_M_manager) {
_M_manager(_M_functor, _M_functor, __destroy_functor);
_M_manager = 0;
_M_invoker = 0;
}
return *this;
}
/**
* @brief %Function assignment to a new target.
* @param f A %function object that is callable with parameters of
* type @c T1, @c T2, ..., @c TN and returns a value convertible
* to @c Res.
* @return @c *this
*
* This %function object wrapper will target a copy of @a
* f. If @a f is @c reference_wrapper<F>, then this function
* object will contain a reference to the function object @c
* f.get(). If @a f is a NULL function pointer or NULL
* pointer-to-member, @c this object will be empty.
*
* If @a f is a non-NULL function pointer or an object of type @c
* reference_wrapper<F>, this function will not throw.
*/
template<typename _Functor>
typename __enable_if<function&, !is_integral<_Functor>::value>::__type
operator=(_Functor __f)
{
function(__f).swap(*this);
return *this;
}
// [3.7.2.2] function modifiers
/**
* @brief Swap the targets of two %function objects.
* @param f A %function with identical call signature.
*
* Swap the targets of @c this function object and @a f. This
* function will not throw an exception.
*/
void swap(function& __x)
{
_Any_data __old_functor = _M_functor;
_M_functor = __x._M_functor;
__x._M_functor = __old_functor;
_Manager_type __old_manager = _M_manager;
_M_manager = __x._M_manager;
__x._M_manager = __old_manager;
_Invoker_type __old_invoker = _M_invoker;
_M_invoker = __x._M_invoker;
__x._M_invoker = __old_invoker;
}
// [3.7.2.3] function capacity
/**
* @brief Determine if the %function wrapper has a target.
*
* @return @c true when this %function object contains a target,
* or @c false when it is empty.
*
* This function will not throw an exception.
*/
operator _Safe_bool() const
{
if (_M_empty())
{
return 0;
}
else
{
return &_Hidden_type::_M_bool;
}
}
// [3.7.2.4] function invocation
/**
* @brief Invokes the function targeted by @c *this.
* @returns the result of the target.
* @throws bad_function_call when @c !(bool)*this
*
* The function call operator invokes the target function object
* stored by @c this.
*/
_Res operator()(_GLIBCXX_PARAMS) const;
// [3.7.2.5] function target access
/**
* @brief Determine the type of the target of this function object
* wrapper.
*
* @returns the type identifier of the target function object, or
* @c typeid(void) if @c !(bool)*this.
*
* This function will not throw an exception.
*/
const type_info& target_type() const;
/**
* @brief Access the stored target function object.
*
* @return Returns a pointer to the stored target function object,
* if @c typeid(Functor).equals(target_type()); otherwise, a NULL
* pointer.
*
* This function will not throw an exception.
*/
template<typename _Functor> _Functor* target();
/**
* @overload
*/
template<typename _Functor> const _Functor* target() const;
private:
// [3.7.2.6] undefined operators
template<typename _Function>
void operator==(const function<_Function>&) const;
template<typename _Function>
void operator!=(const function<_Function>&) const;
typedef _Res (*_Invoker_type)(const _Any_data& _GLIBCXX_COMMA
_GLIBCXX_PARAMS);
_Invoker_type _M_invoker;
};
template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
function<_Res(_GLIBCXX_TEMPLATE_ARGS)>::function(const function& __x)
: _Function_base()
{
if (__x) {
_M_invoker = __x._M_invoker;
_M_manager = __x._M_manager;
__x._M_manager(_M_functor, __x._M_functor, __clone_functor);
}
}
template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
template<typename _Functor>
function<_Res(_GLIBCXX_TEMPLATE_ARGS)>
::function(_Functor __f,
typename __enable_if<_Useless,
!is_integral<_Functor>::value>::__type)
: _Function_base()
{
typedef _Function_handler<_Signature_type, _Functor> _My_handler;
if (_My_handler::_M_not_empty_function(__f)) {
_M_invoker = &_My_handler::_M_invoke;
_M_manager = &_My_handler::_M_manager;
_My_handler::_M_init_functor(_M_functor, __f);
}
}
template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
_Res
function<_Res(_GLIBCXX_TEMPLATE_ARGS)>::operator()(_GLIBCXX_PARAMS) const
{
if (_M_empty())
{
#if __EXCEPTIONS
throw bad_function_call();
#else
std::abort();
#endif
}
return _M_invoker(_M_functor _GLIBCXX_COMMA _GLIBCXX_ARGS);
}
template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
const type_info&
function<_Res(_GLIBCXX_TEMPLATE_ARGS)>::target_type() const
{
if (_M_manager)
{
_Any_data __typeinfo_result;
_M_manager(__typeinfo_result, _M_functor, __get_type_info);
return *__typeinfo_result._M_access<const type_info*>();
}
else
{
return typeid(void);
}
}
template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
template<typename _Functor>
_Functor*
function<_Res(_GLIBCXX_TEMPLATE_ARGS)>::target()
{
if (typeid(_Functor) == target_type() && _M_manager)
{
_Any_data __ptr;
if (_M_manager(__ptr, _M_functor, __get_functor_ptr)
&& !is_const<_Functor>::value)
return 0;
else
return __ptr._M_access<_Functor*>();
}
else
{
return 0;
}
}
template<typename _Res _GLIBCXX_COMMA _GLIBCXX_TEMPLATE_PARAMS>
template<typename _Functor>
const _Functor*
function<_Res(_GLIBCXX_TEMPLATE_ARGS)>::target() const
{
if (typeid(_Functor) == target_type() && _M_manager)
{
_Any_data __ptr;
_M_manager(__ptr, _M_functor, __get_functor_ptr);
return __ptr._M_access<const _Functor*>();
}
else
{
return 0;
}
}
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