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Diffstat (limited to 'libstdc++/include/tr1/functional_iterate.h')
| -rw-r--r-- | libstdc++/include/tr1/functional_iterate.h | 922 |
1 files changed, 922 insertions, 0 deletions
diff --git a/libstdc++/include/tr1/functional_iterate.h b/libstdc++/include/tr1/functional_iterate.h new file mode 100644 index 0000000..c9c1e83 --- /dev/null +++ b/libstdc++/include/tr1/functional_iterate.h @@ -0,0 +1,922 @@ +// TR1 functional -*- C++ -*- + +// Copyright (C) 2005, 2006 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, +// 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 tr1/functional_iterate.h + * This is an internal header file, included by other library headers. + * You should not attempt to use it directly. + */ + +namespace std +{ +_GLIBCXX_BEGIN_NAMESPACE(tr1) + +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 __gnu_cxx::__enable_if<(!is_member_pointer<_Functor>::value + && !is_function<_Functor>::value + && !is_function<typename remove_pointer<_Functor>::type>::value), + typename result_of<_Functor(_GLIBCXX_TEMPLATE_ARGS)>::type>::__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 __gnu_cxx::__enable_if<(is_member_pointer<_Functor>::value + && !is_function<_Functor>::value + && !is_function<typename remove_pointer<_Functor>::type>::value), + typename result_of<_Functor(_GLIBCXX_TEMPLATE_ARGS)>::type + >::__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 __gnu_cxx::__enable_if<(is_pointer<_Functor>::value + && is_function<typename remove_pointer<_Functor>::type>::value), + typename result_of<_Functor(_GLIBCXX_TEMPLATE_ARGS)>::type + >::__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 __pf) : __pmf(__pf) { } + + // 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 __pf) : __pmf(__pf) { } + + // 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 __pf) : __pmf(__pf) { } + + // 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 __pf) : __pmf(__pf) { } + + // 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); +} // anonymous namespace +} +#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 __gnu_cxx::__enable_if<!is_integral<_Functor>::value, _Useless>::__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 __gnu_cxx::__enable_if<!is_integral<_Functor>::value, function&>::__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 __gnu_cxx::__enable_if<!is_integral<_Functor>::value, _Useless>::__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; + } + } + +_GLIBCXX_END_NAMESPACE +} |
