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// -*- C++ -*-
// Copyright (C) 2001-2013 Free Software Foundation, Inc.
//
// 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 3, 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.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// .
/*
* Copyright (c) 1997
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appear in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation. Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
*/
/** @file include/functional
* This is a Standard C++ Library header.
*/
#ifndef _GLIBCXX_FUNCTIONAL
#define _GLIBCXX_FUNCTIONAL 1
#pragma GCC system_header
#include
#include
#if __cplusplus >= 201103L
#include
#include
#include
#include
#include
#include
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
template
class _Mem_fn;
template
_Mem_fn<_Tp _Class::*>
mem_fn(_Tp _Class::*) noexcept;
_GLIBCXX_HAS_NESTED_TYPE(result_type)
/// If we have found a result_type, extract it.
template
struct _Maybe_get_result_type
{ };
template
struct _Maybe_get_result_type
{ typedef typename _Functor::result_type result_type; };
/**
* Base class for any function object that has a weak result type, as
* defined in 3.3/3 of TR1.
*/
template
struct _Weak_result_type_impl
: _Maybe_get_result_type<__has_result_type<_Functor>::value, _Functor>
{ };
/// Retrieve the result type for a function type.
template
struct _Weak_result_type_impl<_Res(_ArgTypes...)>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res(_ArgTypes......)>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res(_ArgTypes...) const>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res(_ArgTypes......) const>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res(_ArgTypes...) volatile>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res(_ArgTypes......) volatile>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res(_ArgTypes...) const volatile>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res(_ArgTypes......) const volatile>
{ typedef _Res result_type; };
/// Retrieve the result type for a function reference.
template
struct _Weak_result_type_impl<_Res(&)(_ArgTypes...)>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res(&)(_ArgTypes......)>
{ typedef _Res result_type; };
/// Retrieve the result type for a function pointer.
template
struct _Weak_result_type_impl<_Res(*)(_ArgTypes...)>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res(*)(_ArgTypes......)>
{ typedef _Res result_type; };
/// Retrieve result type for a member function pointer.
template
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)>
{ typedef _Res result_type; };
/// Retrieve result type for a const member function pointer.
template
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) const>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) const>
{ typedef _Res result_type; };
/// Retrieve result type for a volatile member function pointer.
template
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) volatile>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) volatile>
{ typedef _Res result_type; };
/// Retrieve result type for a const volatile member function pointer.
template
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)
const volatile>
{ typedef _Res result_type; };
template
struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)
const volatile>
{ typedef _Res result_type; };
/**
* Strip top-level cv-qualifiers from the function object and let
* _Weak_result_type_impl perform the real work.
*/
template
struct _Weak_result_type
: _Weak_result_type_impl::type>
{ };
/// Determines if the type _Tp derives from unary_function.
template
struct _Derives_from_unary_function : __sfinae_types
{
private:
template
static __one __test(const volatile unary_function<_T1, _Res>*);
// It's tempting to change "..." to const volatile void*, but
// that fails when _Tp is a function type.
static __two __test(...);
public:
static const bool value = sizeof(__test((_Tp*)0)) == 1;
};
/// Determines if the type _Tp derives from binary_function.
template
struct _Derives_from_binary_function : __sfinae_types
{
private:
template
static __one __test(const volatile binary_function<_T1, _T2, _Res>*);
// It's tempting to change "..." to const volatile void*, but
// that fails when _Tp is a function type.
static __two __test(...);
public:
static const bool value = sizeof(__test((_Tp*)0)) == 1;
};
/**
* Invoke a function object, which may be either a member pointer or a
* function object. The first parameter will tell which.
*/
template
inline
typename enable_if<
(!is_member_pointer<_Functor>::value
&& !is_function<_Functor>::value
&& !is_function::type>::value),
typename result_of<_Functor&(_Args&&...)>::type
>::type
__invoke(_Functor& __f, _Args&&... __args)
{
return __f(std::forward<_Args>(__args)...);
}
template
inline
typename enable_if<
(is_member_pointer<_Functor>::value
&& !is_function<_Functor>::value
&& !is_function::type>::value),
typename result_of<_Functor(_Args&&...)>::type
>::type
__invoke(_Functor& __f, _Args&&... __args)
{
return std::mem_fn(__f)(std::forward<_Args>(__args)...);
}
// To pick up function references (that will become function pointers)
template
inline
typename enable_if<
(is_pointer<_Functor>::value
&& is_function::type>::value),
typename result_of<_Functor(_Args&&...)>::type
>::type
__invoke(_Functor __f, _Args&&... __args)
{
return __f(std::forward<_Args>(__args)...);
}
/**
* Knowing which of unary_function and binary_function _Tp derives
* from, derives from the same and ensures that reference_wrapper
* will have a weak result type. See cases below.
*/
template
struct _Reference_wrapper_base_impl;
// None of the nested argument types.
template
struct _Reference_wrapper_base_impl
: _Weak_result_type<_Tp>
{ };
// Nested argument_type only.
template
struct _Reference_wrapper_base_impl
: _Weak_result_type<_Tp>
{
typedef typename _Tp::argument_type argument_type;
};
// Nested first_argument_type and second_argument_type only.
template
struct _Reference_wrapper_base_impl
: _Weak_result_type<_Tp>
{
typedef typename _Tp::first_argument_type first_argument_type;
typedef typename _Tp::second_argument_type second_argument_type;
};
// All the nested argument types.
template
struct _Reference_wrapper_base_impl
: _Weak_result_type<_Tp>
{
typedef typename _Tp::argument_type argument_type;
typedef typename _Tp::first_argument_type first_argument_type;
typedef typename _Tp::second_argument_type second_argument_type;
};
_GLIBCXX_HAS_NESTED_TYPE(argument_type)
_GLIBCXX_HAS_NESTED_TYPE(first_argument_type)
_GLIBCXX_HAS_NESTED_TYPE(second_argument_type)
/**
* Derives from unary_function or binary_function when it
* can. Specializations handle all of the easy cases. The primary
* template determines what to do with a class type, which may
* derive from both unary_function and binary_function.
*/
template
struct _Reference_wrapper_base
: _Reference_wrapper_base_impl<
__has_argument_type<_Tp>::value,
__has_first_argument_type<_Tp>::value
&& __has_second_argument_type<_Tp>::value,
_Tp>
{ };
// - a function type (unary)
template
struct _Reference_wrapper_base<_Res(_T1)>
: unary_function<_T1, _Res>
{ };
template
struct _Reference_wrapper_base<_Res(_T1) const>
: unary_function<_T1, _Res>
{ };
template
struct _Reference_wrapper_base<_Res(_T1) volatile>
: unary_function<_T1, _Res>
{ };
template
struct _Reference_wrapper_base<_Res(_T1) const volatile>
: unary_function<_T1, _Res>
{ };
// - a function type (binary)
template
struct _Reference_wrapper_base<_Res(_T1, _T2)>
: binary_function<_T1, _T2, _Res>
{ };
template
struct _Reference_wrapper_base<_Res(_T1, _T2) const>
: binary_function<_T1, _T2, _Res>
{ };
template
struct _Reference_wrapper_base<_Res(_T1, _T2) volatile>
: binary_function<_T1, _T2, _Res>
{ };
template
struct _Reference_wrapper_base<_Res(_T1, _T2) const volatile>
: binary_function<_T1, _T2, _Res>
{ };
// - a function pointer type (unary)
template
struct _Reference_wrapper_base<_Res(*)(_T1)>
: unary_function<_T1, _Res>
{ };
// - a function pointer type (binary)
template
struct _Reference_wrapper_base<_Res(*)(_T1, _T2)>
: binary_function<_T1, _T2, _Res>
{ };
// - a pointer to member function type (unary, no qualifiers)
template
struct _Reference_wrapper_base<_Res (_T1::*)()>
: unary_function<_T1*, _Res>
{ };
// - a pointer to member function type (binary, no qualifiers)
template
struct _Reference_wrapper_base<_Res (_T1::*)(_T2)>
: binary_function<_T1*, _T2, _Res>
{ };
// - a pointer to member function type (unary, const)
template
struct _Reference_wrapper_base<_Res (_T1::*)() const>
: unary_function
{ };
// - a pointer to member function type (binary, const)
template
struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const>
: binary_function
{ };
// - a pointer to member function type (unary, volatile)
template
struct _Reference_wrapper_base<_Res (_T1::*)() volatile>
: unary_function
{ };
// - a pointer to member function type (binary, volatile)
template
struct _Reference_wrapper_base<_Res (_T1::*)(_T2) volatile>
: binary_function
{ };
// - a pointer to member function type (unary, const volatile)
template
struct _Reference_wrapper_base<_Res (_T1::*)() const volatile>
: unary_function
{ };
// - a pointer to member function type (binary, const volatile)
template
struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const volatile>
: binary_function
{ };
/**
* @brief Primary class template for reference_wrapper.
* @ingroup functors
* @{
*/
template
class reference_wrapper
: public _Reference_wrapper_base::type>
{
_Tp* _M_data;
public:
typedef _Tp type;
reference_wrapper(_Tp& __indata) noexcept
: _M_data(std::__addressof(__indata))
{ }
reference_wrapper(_Tp&&) = delete;
reference_wrapper(const reference_wrapper<_Tp>& __inref) noexcept
: _M_data(__inref._M_data)
{ }
reference_wrapper&
operator=(const reference_wrapper<_Tp>& __inref) noexcept
{
_M_data = __inref._M_data;
return *this;
}
operator _Tp&() const noexcept
{ return this->get(); }
_Tp&
get() const noexcept
{ return *_M_data; }
template
typename result_of<_Tp&(_Args&&...)>::type
operator()(_Args&&... __args) const
{
return __invoke(get(), std::forward<_Args>(__args)...);
}
};
/// Denotes a reference should be taken to a variable.
template
inline reference_wrapper<_Tp>
ref(_Tp& __t) noexcept
{ return reference_wrapper<_Tp>(__t); }
/// Denotes a const reference should be taken to a variable.
template
inline reference_wrapper
cref(const _Tp& __t) noexcept
{ return reference_wrapper(__t); }
template
void ref(const _Tp&&) = delete;
template
void cref(const _Tp&&) = delete;
/// Partial specialization.
template
inline reference_wrapper<_Tp>
ref(reference_wrapper<_Tp> __t) noexcept
{ return ref(__t.get()); }
/// Partial specialization.
template
inline reference_wrapper
cref(reference_wrapper<_Tp> __t) noexcept
{ return cref(__t.get()); }
// @} group functors
template
struct _Pack : integral_constant
{ };
template
struct _AllConvertible : false_type
{ };
template
struct _AllConvertible<_Pack<_From...>, _Pack<_To...>, true>
: __and_...>
{ };
template
using _NotSame = __not_::type,
typename std::decay<_Tp2>::type>>;
/**
* Derives from @c unary_function or @c binary_function, or perhaps
* nothing, depending on the number of arguments provided. The
* primary template is the basis case, which derives nothing.
*/
template
struct _Maybe_unary_or_binary_function { };
/// Derives from @c unary_function, as appropriate.
template
struct _Maybe_unary_or_binary_function<_Res, _T1>
: std::unary_function<_T1, _Res> { };
/// Derives from @c binary_function, as appropriate.
template
struct _Maybe_unary_or_binary_function<_Res, _T1, _T2>
: std::binary_function<_T1, _T2, _Res> { };
/// Implementation of @c mem_fn for member function pointers.
template
class _Mem_fn<_Res (_Class::*)(_ArgTypes...)>
: public _Maybe_unary_or_binary_function<_Res, _Class*, _ArgTypes...>
{
typedef _Res (_Class::*_Functor)(_ArgTypes...);
template
_Res
_M_call(_Tp&& __object, const volatile _Class *,
_Args&&... __args) const
{
return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_Args>(__args)...);
}
template
_Res
_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
// Require each _Args to be convertible to corresponding _ArgTypes
template
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
// Require each _Args to be convertible to corresponding _ArgTypes
// and require _Tp is not _Class, _Class& or _Class*
template
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>, _NotSame<_Class*, _Tp>,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
// Require each _Args to be convertible to corresponding _ArgTypes
// and require _Tp is _Class or derived from _Class
template
using _RequireValidArgs3
= _Require,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
template>
_Res
operator()(_Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
template>
_Res
operator()(_Class&& __object, _Args&&... __args) const
{
return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
}
// Handle pointers
template>
_Res
operator()(_Class* __object, _Args&&... __args) const
{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template>
_Res
operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private:
_Functor __pmf;
};
/// Implementation of @c mem_fn for const member function pointers.
template
class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const>
: public _Maybe_unary_or_binary_function<_Res, const _Class*,
_ArgTypes...>
{
typedef _Res (_Class::*_Functor)(_ArgTypes...) const;
template
_Res
_M_call(_Tp&& __object, const volatile _Class *,
_Args&&... __args) const
{
return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_Args>(__args)...);
}
template
_Res
_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
template
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>, _NotSame,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template
using _RequireValidArgs3
= _Require,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
template>
_Res
operator()(const _Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
template>
_Res
operator()(const _Class&& __object, _Args&&... __args) const
{
return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
}
// Handle pointers
template>
_Res
operator()(const _Class* __object, _Args&&... __args) const
{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template>
_Res operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private:
_Functor __pmf;
};
/// Implementation of @c mem_fn for volatile member function pointers.
template
class _Mem_fn<_Res (_Class::*)(_ArgTypes...) volatile>
: public _Maybe_unary_or_binary_function<_Res, volatile _Class*,
_ArgTypes...>
{
typedef _Res (_Class::*_Functor)(_ArgTypes...) volatile;
template
_Res
_M_call(_Tp&& __object, const volatile _Class *,
_Args&&... __args) const
{
return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_Args>(__args)...);
}
template
_Res
_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
template
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>, _NotSame,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template
using _RequireValidArgs3
= _Require,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
template>
_Res
operator()(volatile _Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
template>
_Res
operator()(volatile _Class&& __object, _Args&&... __args) const
{
return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
}
// Handle pointers
template>
_Res
operator()(volatile _Class* __object, _Args&&... __args) const
{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template>
_Res
operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private:
_Functor __pmf;
};
/// Implementation of @c mem_fn for const volatile member function pointers.
template
class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const volatile>
: public _Maybe_unary_or_binary_function<_Res, const volatile _Class*,
_ArgTypes...>
{
typedef _Res (_Class::*_Functor)(_ArgTypes...) const volatile;
template
_Res
_M_call(_Tp&& __object, const volatile _Class *,
_Args&&... __args) const
{
return (std::forward<_Tp>(__object).*__pmf)
(std::forward<_Args>(__args)...);
}
template
_Res
_M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const
{ return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); }
template
using _RequireValidArgs
= _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template
using _RequireValidArgs2
= _Require<_NotSame<_Class, _Tp>,
_NotSame,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
template
using _RequireValidArgs3
= _Require,
_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>;
public:
typedef _Res result_type;
explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { }
// Handle objects
template>
_Res
operator()(const volatile _Class& __object, _Args&&... __args) const
{ return (__object.*__pmf)(std::forward<_Args>(__args)...); }
template>
_Res
operator()(const volatile _Class&& __object, _Args&&... __args) const
{
return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...);
}
// Handle pointers
template>
_Res
operator()(const volatile _Class* __object, _Args&&... __args) const
{ return (__object->*__pmf)(std::forward<_Args>(__args)...); }
// Handle smart pointers, references and pointers to derived
template>
_Res operator()(_Tp&& __object, _Args&&... __args) const
{
return _M_call(std::forward<_Tp>(__object), &__object,
std::forward<_Args>(__args)...);
}
template>
_Res
operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const
{ return operator()(__ref.get(), std::forward<_Args>(__args)...); }
private:
_Functor __pmf;
};
template
struct _Mem_fn_const_or_non
{
typedef const _Tp& type;
};
template
struct _Mem_fn_const_or_non<_Tp, false>
{
typedef _Tp& type;
};
template
class _Mem_fn<_Res _Class::*>
{
using __pm_type = _Res _Class::*;
// This bit of genius is due to Peter Dimov, improved slightly by
// Douglas Gregor.
// Made less elegant to support perfect forwarding and noexcept.
template
auto
_M_call(_Tp&& __object, const _Class *) const noexcept
-> decltype(std::forward<_Tp>(__object).*std::declval<__pm_type&>())
{ return std::forward<_Tp>(__object).*__pm; }
template
auto
_M_call(_Tp&& __object, _Up * const *) const noexcept
-> decltype((*std::forward<_Tp>(__object)).*std::declval<__pm_type&>())
{ return (*std::forward<_Tp>(__object)).*__pm; }
template
auto
_M_call(_Tp&& __ptr, const volatile void*) const
noexcept(noexcept((*__ptr).*std::declval<__pm_type&>()))
-> decltype((*__ptr).*std::declval<__pm_type&>())
{ return (*__ptr).*__pm; }
public:
explicit
_Mem_fn(_Res _Class::*__pm) noexcept : __pm(__pm) { }
// Handle objects
_Res&
operator()(_Class& __object) const noexcept
{ return __object.*__pm; }
const _Res&
operator()(const _Class& __object) const noexcept
{ return __object.*__pm; }
_Res&&
operator()(_Class&& __object) const noexcept
{ return std::forward<_Class>(__object).*__pm; }
const _Res&&
operator()(const _Class&& __object) const noexcept
{ return std::forward(__object).*__pm; }
// Handle pointers
_Res&
operator()(_Class* __object) const noexcept
{ return __object->*__pm; }
const _Res&
operator()(const _Class* __object) const noexcept
{ return __object->*__pm; }
// Handle smart pointers and derived
template>>
auto
operator()(_Tp&& __unknown) const
noexcept(noexcept(std::declval<_Mem_fn*>()->_M_call
(std::forward<_Tp>(__unknown), &__unknown)))
-> decltype(this->_M_call(std::forward<_Tp>(__unknown), &__unknown))
{ return _M_call(std::forward<_Tp>(__unknown), &__unknown); }
template>>
auto
operator()(reference_wrapper<_Tp> __ref) const
noexcept(noexcept(std::declval<_Mem_fn&>()(__ref.get())))
-> decltype((*this)(__ref.get()))
{ return (*this)(__ref.get()); }
private:
_Res _Class::*__pm;
};
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2048. Unnecessary mem_fn overloads
/**
* @brief Returns a function object that forwards to the member
* pointer @a pm.
* @ingroup functors
*/
template
inline _Mem_fn<_Tp _Class::*>
mem_fn(_Tp _Class::* __pm) noexcept
{
return _Mem_fn<_Tp _Class::*>(__pm);
}
/**
* @brief Determines if the given type _Tp is a function object
* should be treated as a subexpression when evaluating calls to
* function objects returned by bind(). [TR1 3.6.1]
* @ingroup binders
*/
template
struct is_bind_expression
: public false_type { };
/**
* @brief Determines if the given type _Tp is a placeholder in a
* bind() expression and, if so, which placeholder it is. [TR1 3.6.2]
* @ingroup binders
*/
template
struct is_placeholder
: public integral_constant
{ };
/** @brief The type of placeholder objects defined by libstdc++.
* @ingroup binders
*/
template struct _Placeholder { };
_GLIBCXX_END_NAMESPACE_VERSION
/** @namespace std::placeholders
* @brief ISO C++11 entities sub-namespace for functional.
* @ingroup binders
*/
namespace placeholders
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/* Define a large number of placeholders. There is no way to
* simplify this with variadic templates, because we're introducing
* unique names for each.
*/
extern const _Placeholder<1> _1;
extern const _Placeholder<2> _2;
extern const _Placeholder<3> _3;
extern const _Placeholder<4> _4;
extern const _Placeholder<5> _5;
extern const _Placeholder<6> _6;
extern const _Placeholder<7> _7;
extern const _Placeholder<8> _8;
extern const _Placeholder<9> _9;
extern const _Placeholder<10> _10;
extern const _Placeholder<11> _11;
extern const _Placeholder<12> _12;
extern const _Placeholder<13> _13;
extern const _Placeholder<14> _14;
extern const _Placeholder<15> _15;
extern const _Placeholder<16> _16;
extern const _Placeholder<17> _17;
extern const _Placeholder<18> _18;
extern const _Placeholder<19> _19;
extern const _Placeholder<20> _20;
extern const _Placeholder<21> _21;
extern const _Placeholder<22> _22;
extern const _Placeholder<23> _23;
extern const _Placeholder<24> _24;
extern const _Placeholder<25> _25;
extern const _Placeholder<26> _26;
extern const _Placeholder<27> _27;
extern const _Placeholder<28> _28;
extern const _Placeholder<29> _29;
_GLIBCXX_END_NAMESPACE_VERSION
}
_GLIBCXX_BEGIN_NAMESPACE_VERSION
/**
* Partial specialization of is_placeholder that provides the placeholder
* number for the placeholder objects defined by libstdc++.
* @ingroup binders
*/
template
struct is_placeholder<_Placeholder<_Num> >
: public integral_constant
{ };
template
struct is_placeholder >
: public integral_constant
{ };
/**
* Used by _Safe_tuple_element to indicate that there is no tuple
* element at this position.
*/
struct _No_tuple_element;
/**
* Implementation helper for _Safe_tuple_element. This primary
* template handles the case where it is safe to use @c
* tuple_element.
*/
template
struct _Safe_tuple_element_impl
: tuple_element<__i, _Tuple> { };
/**
* Implementation helper for _Safe_tuple_element. This partial
* specialization handles the case where it is not safe to use @c
* tuple_element. We just return @c _No_tuple_element.
*/
template
struct _Safe_tuple_element_impl<__i, _Tuple, false>
{
typedef _No_tuple_element type;
};
/**
* Like tuple_element, but returns @c _No_tuple_element when
* tuple_element would return an error.
*/
template
struct _Safe_tuple_element
: _Safe_tuple_element_impl<__i, _Tuple,
(__i < tuple_size<_Tuple>::value)>
{ };
/**
* Maps an argument to bind() into an actual argument to the bound
* function object [TR1 3.6.3/5]. Only the first parameter should
* be specified: the rest are used to determine among the various
* implementations. Note that, although this class is a function
* object, it isn't entirely normal because it takes only two
* parameters regardless of the number of parameters passed to the
* bind expression. The first parameter is the bound argument and
* the second parameter is a tuple containing references to the
* rest of the arguments.
*/
template::value,
bool _IsPlaceholder = (is_placeholder<_Arg>::value > 0)>
class _Mu;
/**
* If the argument is reference_wrapper<_Tp>, returns the
* underlying reference. [TR1 3.6.3/5 bullet 1]
*/
template
class _Mu, false, false>
{
public:
typedef _Tp& result_type;
/* Note: This won't actually work for const volatile
* reference_wrappers, because reference_wrapper::get() is const
* but not volatile-qualified. This might be a defect in the TR.
*/
template
result_type
operator()(_CVRef& __arg, _Tuple&) const volatile
{ return __arg.get(); }
};
/**
* If the argument is a bind expression, we invoke the underlying
* function object with the same cv-qualifiers as we are given and
* pass along all of our arguments (unwrapped). [TR1 3.6.3/5 bullet 2]
*/
template
class _Mu<_Arg, true, false>
{
public:
template
auto
operator()(_CVArg& __arg,
tuple<_Args...>& __tuple) const volatile
-> decltype(__arg(declval<_Args>()...))
{
// Construct an index tuple and forward to __call
typedef typename _Build_index_tuple::__type
_Indexes;
return this->__call(__arg, __tuple, _Indexes());
}
private:
// Invokes the underlying function object __arg by unpacking all
// of the arguments in the tuple.
template
auto
__call(_CVArg& __arg, tuple<_Args...>& __tuple,
const _Index_tuple<_Indexes...>&) const volatile
-> decltype(__arg(declval<_Args>()...))
{
return __arg(std::forward<_Args>(get<_Indexes>(__tuple))...);
}
};
/**
* If the argument is a placeholder for the Nth argument, returns
* a reference to the Nth argument to the bind function object.
* [TR1 3.6.3/5 bullet 3]
*/
template
class _Mu<_Arg, false, true>
{
public:
template class result;
template
class result<_CVMu(_CVArg, _Tuple)>
{
// Add a reference, if it hasn't already been done for us.
// This allows us to be a little bit sloppy in constructing
// the tuple that we pass to result_of<...>.
typedef typename _Safe_tuple_element<(is_placeholder<_Arg>::value
- 1), _Tuple>::type
__base_type;
public:
typedef typename add_rvalue_reference<__base_type>::type type;
};
template
typename result<_Mu(_Arg, _Tuple)>::type
operator()(const volatile _Arg&, _Tuple& __tuple) const volatile
{
return std::forward::type>(
::std::get<(is_placeholder<_Arg>::value - 1)>(__tuple));
}
};
/**
* If the argument is just a value, returns a reference to that
* value. The cv-qualifiers on the reference are the same as the
* cv-qualifiers on the _Mu object. [TR1 3.6.3/5 bullet 4]
*/
template
class _Mu<_Arg, false, false>
{
public:
template struct result;
template
struct result<_CVMu(_CVArg, _Tuple)>
{
typedef typename add_lvalue_reference<_CVArg>::type type;
};
// Pick up the cv-qualifiers of the argument
template
_CVArg&&
operator()(_CVArg&& __arg, _Tuple&) const volatile
{ return std::forward<_CVArg>(__arg); }
};
/**
* Maps member pointers into instances of _Mem_fn but leaves all
* other function objects untouched. Used by tr1::bind(). The
* primary template handles the non--member-pointer case.
*/
template
struct _Maybe_wrap_member_pointer
{
typedef _Tp type;
static const _Tp&
__do_wrap(const _Tp& __x)
{ return __x; }
static _Tp&&
__do_wrap(_Tp&& __x)
{ return static_cast<_Tp&&>(__x); }
};
/**
* Maps member pointers into instances of _Mem_fn but leaves all
* other function objects untouched. Used by tr1::bind(). This
* partial specialization handles the member pointer case.
*/
template
struct _Maybe_wrap_member_pointer<_Tp _Class::*>
{
typedef _Mem_fn<_Tp _Class::*> type;
static type
__do_wrap(_Tp _Class::* __pm)
{ return type(__pm); }
};
// Specialization needed to prevent "forming reference to void" errors when
// bind() is called, because argument deduction instantiates
// _Maybe_wrap_member_pointer outside the immediate context where
// SFINAE applies.
template<>
struct _Maybe_wrap_member_pointer
{
typedef void type;
};
// std::get for volatile-qualified tuples
template
inline auto
__volget(volatile tuple<_Tp...>& __tuple)
-> typename tuple_element<_Ind, tuple<_Tp...>>::type volatile&
{ return std::get<_Ind>(const_cast&>(__tuple)); }
// std::get for const-volatile-qualified tuples
template
inline auto
__volget(const volatile tuple<_Tp...>& __tuple)
-> typename tuple_element<_Ind, tuple<_Tp...>>::type const volatile&
{ return std::get<_Ind>(const_cast&>(__tuple)); }
/// Type of the function object returned from bind().
template
struct _Bind;
template
class _Bind<_Functor(_Bound_args...)>
: public _Weak_result_type<_Functor>
{
typedef _Bind __self_type;
typedef typename _Build_index_tuple::__type
_Bound_indexes;
_Functor _M_f;
tuple<_Bound_args...> _M_bound_args;
// Call unqualified
template
_Result
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>)
{
return _M_f(_Mu<_Bound_args>()
(get<_Indexes>(_M_bound_args), __args)...);
}
// Call as const
template
_Result
__call_c(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const
{
return _M_f(_Mu<_Bound_args>()
(get<_Indexes>(_M_bound_args), __args)...);
}
// Call as volatile
template
_Result
__call_v(tuple<_Args...>&& __args,
_Index_tuple<_Indexes...>) volatile
{
return _M_f(_Mu<_Bound_args>()
(__volget<_Indexes>(_M_bound_args), __args)...);
}
// Call as const volatile
template
_Result
__call_c_v(tuple<_Args...>&& __args,
_Index_tuple<_Indexes...>) const volatile
{
return _M_f(_Mu<_Bound_args>()
(__volget<_Indexes>(_M_bound_args), __args)...);
}
public:
template
explicit _Bind(const _Functor& __f, _Args&&... __args)
: _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...)
{ }
template
explicit _Bind(_Functor&& __f, _Args&&... __args)
: _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...)
{ }
_Bind(const _Bind&) = default;
_Bind(_Bind&& __b)
: _M_f(std::move(__b._M_f)), _M_bound_args(std::move(__b._M_bound_args))
{ }
// Call unqualified
template()(
_Mu<_Bound_args>()( std::declval<_Bound_args&>(),
std::declval&>() )... ) )>
_Result
operator()(_Args&&... __args)
{
return this->__call<_Result>(
std::forward_as_tuple(std::forward<_Args>(__args)...),
_Bound_indexes());
}
// Call as const
template= 0),
typename add_const<_Functor>::type>::type>()(
_Mu<_Bound_args>()( std::declval(),
std::declval&>() )... ) )>
_Result
operator()(_Args&&... __args) const
{
return this->__call_c<_Result>(
std::forward_as_tuple(std::forward<_Args>(__args)...),
_Bound_indexes());
}
// Call as volatile
template= 0),
typename add_volatile<_Functor>::type>::type>()(
_Mu<_Bound_args>()( std::declval(),
std::declval&>() )... ) )>
_Result
operator()(_Args&&... __args) volatile
{
return this->__call_v<_Result>(
std::forward_as_tuple(std::forward<_Args>(__args)...),
_Bound_indexes());
}
// Call as const volatile
template= 0),
typename add_cv<_Functor>::type>::type>()(
_Mu<_Bound_args>()( std::declval(),
std::declval&>() )... ) )>
_Result
operator()(_Args&&... __args) const volatile
{
return this->__call_c_v<_Result>(
std::forward_as_tuple(std::forward<_Args>(__args)...),
_Bound_indexes());
}
};
/// Type of the function object returned from bind().
template
struct _Bind_result;
template
class _Bind_result<_Result, _Functor(_Bound_args...)>
{
typedef _Bind_result __self_type;
typedef typename _Build_index_tuple::__type
_Bound_indexes;
_Functor _M_f;
tuple<_Bound_args...> _M_bound_args;
// sfinae types
template
struct __enable_if_void : enable_if::value, int> { };
template
struct __disable_if_void : enable_if::value, int> { };
// Call unqualified
template
_Result
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
typename __disable_if_void<_Res>::type = 0)
{
return _M_f(_Mu<_Bound_args>()
(get<_Indexes>(_M_bound_args), __args)...);
}
// Call unqualified, return void
template
void
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
typename __enable_if_void<_Res>::type = 0)
{
_M_f(_Mu<_Bound_args>()
(get<_Indexes>(_M_bound_args), __args)...);
}
// Call as const
template
_Result
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
typename __disable_if_void<_Res>::type = 0) const
{
return _M_f(_Mu<_Bound_args>()
(get<_Indexes>(_M_bound_args), __args)...);
}
// Call as const, return void
template
void
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
typename __enable_if_void<_Res>::type = 0) const
{
_M_f(_Mu<_Bound_args>()
(get<_Indexes>(_M_bound_args), __args)...);
}
// Call as volatile
template
_Result
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
typename __disable_if_void<_Res>::type = 0) volatile
{
return _M_f(_Mu<_Bound_args>()
(__volget<_Indexes>(_M_bound_args), __args)...);
}
// Call as volatile, return void
template
void
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
typename __enable_if_void<_Res>::type = 0) volatile
{
_M_f(_Mu<_Bound_args>()
(__volget<_Indexes>(_M_bound_args), __args)...);
}
// Call as const volatile
template
_Result
__call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>,
typename __disable_if_void<_Res>::type = 0) const volatile
{
return _M_f(_Mu<_Bound_args>()
(__volget<_Indexes>(_M_bound_args), __args)...);
}
// Call as const volatile, return void
template
void
__call(tuple<_Args...>&& __args,
_Index_tuple<_Indexes...>,
typename __enable_if_void<_Res>::type = 0) const volatile
{
_M_f(_Mu<_Bound_args>()
(__volget<_Indexes>(_M_bound_args), __args)...);
}
public:
typedef _Result result_type;
template
explicit _Bind_result(const _Functor& __f, _Args&&... __args)
: _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...)
{ }
template
explicit _Bind_result(_Functor&& __f, _Args&&... __args)
: _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...)
{ }
_Bind_result(const _Bind_result&) = default;
_Bind_result(_Bind_result&& __b)
: _M_f(std::move(__b._M_f)), _M_bound_args(std::move(__b._M_bound_args))
{ }
// Call unqualified
template
result_type
operator()(_Args&&... __args)
{
return this->__call<_Result>(
std::forward_as_tuple(std::forward<_Args>(__args)...),
_Bound_indexes());
}
// Call as const
template
result_type
operator()(_Args&&... __args) const
{
return this->__call<_Result>(
std::forward_as_tuple(std::forward<_Args>(__args)...),
_Bound_indexes());
}
// Call as volatile
template
result_type
operator()(_Args&&... __args) volatile
{
return this->__call<_Result>(
std::forward_as_tuple(std::forward<_Args>(__args)...),
_Bound_indexes());
}
// Call as const volatile
template
result_type
operator()(_Args&&... __args) const volatile
{
return this->__call<_Result>(
std::forward_as_tuple(std::forward<_Args>(__args)...),
_Bound_indexes());
}
};
/**
* @brief Class template _Bind is always a bind expression.
* @ingroup binders
*/
template
struct is_bind_expression<_Bind<_Signature> >
: public true_type { };
/**
* @brief Class template _Bind is always a bind expression.
* @ingroup binders
*/
template
struct is_bind_expression >
: public true_type { };
/**
* @brief Class template _Bind is always a bind expression.
* @ingroup binders
*/
template
struct is_bind_expression >
: public true_type { };
/**
* @brief Class template _Bind is always a bind expression.
* @ingroup binders
*/
template
struct is_bind_expression>
: public true_type { };
/**
* @brief Class template _Bind_result is always a bind expression.
* @ingroup binders
*/
template
struct is_bind_expression<_Bind_result<_Result, _Signature>>
: public true_type { };
/**
* @brief Class template _Bind_result is always a bind expression.
* @ingroup binders
*/
template