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freebsd-skq/contrib/libc++/include/__tuple
Dimitry Andric d72607e9e2 Import libc++ trunk r224926. This fixes a number of bugs, completes 
C++14 support[1], adds more C++1z features[2], and fixes the following
LWG issues[3]:

1450: Contradiction in regex_constants
2003: String exception inconsistency in erase.
2075: Progress guarantees, lock-free property, and scheduling
      assumptions
2104: unique_lock move-assignment should not be noexcept
2112: User-defined classes that cannot be derived from
2132: std::function ambiguity
2135: Unclear requirement for exceptions thrown in
      condition_variable::wait()
2142: packaged_task::operator() synchronization too broad?
2182: Container::[const_]reference types are misleadingly specified
2186: Incomplete action on async/launch::deferred
2188: Reverse iterator does not fully support targets that overload
      operator&
2193: Default constructors for standard library containers are explicit
2205: Problematic postconditions of regex_match and regex_search
2213: Return value of std::regex_replace
2240: Probable misuse of term "function scope" in [thread.condition]
2252: Strong guarantee on vector::push_back() still broken with C++11?
2257: Simplify container requirements with the new algorithms
2258: a.erase(q1, q2) unable to directly return q2
2263: Comparing iterators and allocator pointers with different
      const-character
2268: Setting a default argument in the declaration of a member
      function assign of std::basic_string
2271: regex_traits::lookup_classname specification unclear
2272: quoted should use char_traits::eq for character comparison
2278: User-defined literals for Standard Library types
2280: begin / end for arrays should be constexpr and noexcept
2285: make_reverse_iterator
2288: Inconsistent requirements for shared mutexes
2291: std::hash is vulnerable to collision DoS attack
2293: Wrong facet used by num_put::do_put
2299: Effects of inaccessible key_compare::is_transparent type are not
      clear
2301: Why is std::tie not constexpr?
2304: Complexity of count in unordered associative containers
2306: match_results::reference should be value_type&, not const
      value_type&
2308: Clarify container destructor requirements w.r.t. std::array
2313: tuple_size should always derive from integral_constant<size_t, N>
2314: apply() should return decltype(auto) and use decay_t before
      tuple_size
2315: weak_ptr should be movable
2316: weak_ptr::lock() should be atomic
2317: The type property queries should be UnaryTypeTraits returning
      size_t
2320: select_on_container_copy_construction() takes allocators, not
      containers
2322: Associative(initializer_list, stuff) constructors are
      underspecified
2323: vector::resize(n, t)'s specification should be simplified
2324: Insert iterator constructors should use addressof()
2329: regex_match()/regex_search() with match_results should forbid
      temporary strings
2330: regex("meow", regex::icase) is technically forbidden but should
      be permitted
2332: regex_iterator/regex_token_iterator should forbid temporary
      regexes
2339: Wording issue in nth_element
2341: Inconsistency between basic_ostream::seekp(pos) and
      basic_ostream::seekp(off, dir)
2344: quoted()'s interaction with padding is unclear
2346: integral_constant's member functions should be marked noexcept
2350: min, max, and minmax should be constexpr
2356: Stability of erasure in unordered associative containers
2357: Remaining "Assignable" requirement
2359: How does regex_constants::nosubs affect basic_regex::mark_count()?
2360: reverse_iterator::operator*() is unimplementable

[1] http://libcxx.llvm.org/cxx1y_status.html
[2] http://libcxx.llvm.org/cxx1z_status.html
[3] http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html

Exp-run:	antoine
MFC after:	1 month
2015-01-15 21:17:36 +00:00

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// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___TUPLE
#define _LIBCPP___TUPLE
#include <__config>
#include <cstddef>
#include <type_traits>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
#ifdef _LIBCPP_HAS_NO_VARIADICS
#include <__tuple_03>
#else // _LIBCPP_HAS_NO_VARIADICS
_LIBCPP_BEGIN_NAMESPACE_STD
// __lazy_and
template <bool _Last, class ..._Preds>
struct __lazy_and_impl;
template <class ..._Preds>
struct __lazy_and_impl<false, _Preds...> : false_type {};
template <>
struct __lazy_and_impl<true> : true_type {};
template <class _Pred>
struct __lazy_and_impl<true, _Pred> : integral_constant<bool, _Pred::type::value> {};
template <class _Hp, class ..._Tp>
struct __lazy_and_impl<true, _Hp, _Tp...> : __lazy_and_impl<_Hp::type::value, _Tp...> {};
template <class _P1, class ..._Pr>
struct __lazy_and : __lazy_and_impl<_P1::type::value, _Pr...> {};
// __lazy_not
template <class _Pred>
struct __lazy_not : integral_constant<bool, !_Pred::type::value> {};
template <class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_size;
template <class _Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_size<const _Tp>
: public tuple_size<_Tp> {};
template <class _Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_size<volatile _Tp>
: public tuple_size<_Tp> {};
template <class _Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_size<const volatile _Tp>
: public tuple_size<_Tp> {};
template <size_t _Ip, class _Tp> class _LIBCPP_TYPE_VIS_ONLY tuple_element;
template <size_t _Ip, class _Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const _Tp>
{
public:
typedef typename add_const<typename tuple_element<_Ip, _Tp>::type>::type type;
};
template <size_t _Ip, class _Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, volatile _Tp>
{
public:
typedef typename add_volatile<typename tuple_element<_Ip, _Tp>::type>::type type;
};
template <size_t _Ip, class _Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, const volatile _Tp>
{
public:
typedef typename add_cv<typename tuple_element<_Ip, _Tp>::type>::type type;
};
template <class ..._Tp> class _LIBCPP_TYPE_VIS_ONLY tuple;
template <class _T1, class _T2> struct _LIBCPP_TYPE_VIS_ONLY pair;
template <class _Tp, size_t _Size> struct _LIBCPP_TYPE_VIS_ONLY array;
template <class _Tp> struct __tuple_like : false_type {};
template <class _Tp> struct __tuple_like<const _Tp> : public __tuple_like<_Tp> {};
template <class _Tp> struct __tuple_like<volatile _Tp> : public __tuple_like<_Tp> {};
template <class _Tp> struct __tuple_like<const volatile _Tp> : public __tuple_like<_Tp> {};
template <class... _Tp> struct __tuple_like<tuple<_Tp...> > : true_type {};
template <class _T1, class _T2> struct __tuple_like<pair<_T1, _T2> > : true_type {};
template <class _Tp, size_t _Size> struct __tuple_like<array<_Tp, _Size> > : true_type {};
template <size_t _Ip, class ..._Tp>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Ip, tuple<_Tp...> >::type&
get(tuple<_Tp...>&) _NOEXCEPT;
template <size_t _Ip, class ..._Tp>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
const typename tuple_element<_Ip, tuple<_Tp...> >::type&
get(const tuple<_Tp...>&) _NOEXCEPT;
template <size_t _Ip, class ..._Tp>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Ip, tuple<_Tp...> >::type&&
get(tuple<_Tp...>&&) _NOEXCEPT;
template <size_t _Ip, class _T1, class _T2>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Ip, pair<_T1, _T2> >::type&
get(pair<_T1, _T2>&) _NOEXCEPT;
template <size_t _Ip, class _T1, class _T2>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
get(const pair<_T1, _T2>&) _NOEXCEPT;
template <size_t _Ip, class _T1, class _T2>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
get(pair<_T1, _T2>&&) _NOEXCEPT;
template <size_t _Ip, class _Tp, size_t _Size>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
_Tp&
get(array<_Tp, _Size>&) _NOEXCEPT;
template <size_t _Ip, class _Tp, size_t _Size>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
const _Tp&
get(const array<_Tp, _Size>&) _NOEXCEPT;
template <size_t _Ip, class _Tp, size_t _Size>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
_Tp&&
get(array<_Tp, _Size>&&) _NOEXCEPT;
// __make_tuple_indices
template <size_t...> struct __tuple_indices {};
template <size_t _Sp, class _IntTuple, size_t _Ep>
struct __make_indices_imp;
template <size_t _Sp, size_t ..._Indices, size_t _Ep>
struct __make_indices_imp<_Sp, __tuple_indices<_Indices...>, _Ep>
{
typedef typename __make_indices_imp<_Sp+1, __tuple_indices<_Indices..., _Sp>, _Ep>::type type;
};
template <size_t _Ep, size_t ..._Indices>
struct __make_indices_imp<_Ep, __tuple_indices<_Indices...>, _Ep>
{
typedef __tuple_indices<_Indices...> type;
};
template <size_t _Ep, size_t _Sp = 0>
struct __make_tuple_indices
{
static_assert(_Sp <= _Ep, "__make_tuple_indices input error");
typedef typename __make_indices_imp<_Sp, __tuple_indices<>, _Ep>::type type;
};
// __tuple_types
template <class ..._Tp> struct __tuple_types {};
template <size_t _Ip>
class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<> >
{
public:
static_assert(_Ip == 0, "tuple_element index out of range");
static_assert(_Ip != 0, "tuple_element index out of range");
};
template <class _Hp, class ..._Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, __tuple_types<_Hp, _Tp...> >
{
public:
typedef _Hp type;
};
template <size_t _Ip, class _Hp, class ..._Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, __tuple_types<_Hp, _Tp...> >
{
public:
typedef typename tuple_element<_Ip-1, __tuple_types<_Tp...> >::type type;
};
template <class ..._Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_size<__tuple_types<_Tp...> >
: public integral_constant<size_t, sizeof...(_Tp)>
{
};
template <class... _Tp> struct __tuple_like<__tuple_types<_Tp...> > : true_type {};
// __make_tuple_types
// __make_tuple_types<_Tuple<_Types...>, _Ep, _Sp>::type is a
// __tuple_types<_Types...> using only those _Types in the range [_Sp, _Ep).
// _Sp defaults to 0 and _Ep defaults to tuple_size<_Tuple>. If _Tuple is a
// lvalue_reference type, then __tuple_types<_Types&...> is the result.
template <class _TupleTypes, class _Tp, size_t _Sp, size_t _Ep>
struct __make_tuple_types_imp;
template <class ..._Types, class _Tp, size_t _Sp, size_t _Ep>
struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Sp, _Ep>
{
typedef typename remove_reference<_Tp>::type _Tpr;
typedef typename __make_tuple_types_imp<__tuple_types<_Types...,
typename conditional<is_lvalue_reference<_Tp>::value,
typename tuple_element<_Sp, _Tpr>::type&,
typename tuple_element<_Sp, _Tpr>::type>::type>,
_Tp, _Sp+1, _Ep>::type type;
};
template <class ..._Types, class _Tp, size_t _Ep>
struct __make_tuple_types_imp<__tuple_types<_Types...>, _Tp, _Ep, _Ep>
{
typedef __tuple_types<_Types...> type;
};
template <class _Tp, size_t _Ep = tuple_size<typename remove_reference<_Tp>::type>::value, size_t _Sp = 0>
struct __make_tuple_types
{
static_assert(_Sp <= _Ep, "__make_tuple_types input error");
typedef typename __make_tuple_types_imp<__tuple_types<>, _Tp, _Sp, _Ep>::type type;
};
// __tuple_convertible
template <class, class>
struct __tuple_convertible_imp : public false_type {};
template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
struct __tuple_convertible_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
: public integral_constant<bool,
is_convertible<_Tp0, _Up0>::value &&
__tuple_convertible_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
template <>
struct __tuple_convertible_imp<__tuple_types<>, __tuple_types<> >
: public true_type {};
template <bool, class, class>
struct __tuple_convertible_apply : public false_type {};
template <class _Tp, class _Up>
struct __tuple_convertible_apply<true, _Tp, _Up>
: public __tuple_convertible_imp<
typename __make_tuple_types<_Tp>::type
, typename __make_tuple_types<_Up>::type
>
{};
template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
bool = __tuple_like<_Up>::value>
struct __tuple_convertible
: public false_type {};
template <class _Tp, class _Up>
struct __tuple_convertible<_Tp, _Up, true, true>
: public __tuple_convertible_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
tuple_size<_Up>::value, _Tp, _Up>
{};
// __tuple_constructible
template <class, class>
struct __tuple_constructible_imp : public false_type {};
template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
struct __tuple_constructible_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
: public integral_constant<bool,
is_constructible<_Up0, _Tp0>::value &&
__tuple_constructible_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
template <>
struct __tuple_constructible_imp<__tuple_types<>, __tuple_types<> >
: public true_type {};
template <bool _SameSize, class, class>
struct __tuple_constructible_apply : public false_type {};
template <class _Tp, class _Up>
struct __tuple_constructible_apply<true, _Tp, _Up>
: public __tuple_constructible_imp<
typename __make_tuple_types<_Tp>::type
, typename __make_tuple_types<_Up>::type
>
{};
template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
bool = __tuple_like<_Up>::value>
struct __tuple_constructible
: public false_type {};
template <class _Tp, class _Up>
struct __tuple_constructible<_Tp, _Up, true, true>
: public __tuple_constructible_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
tuple_size<_Up>::value, _Tp, _Up>
{};
// __tuple_assignable
template <class, class>
struct __tuple_assignable_imp : public false_type {};
template <class _Tp0, class ..._Tp, class _Up0, class ..._Up>
struct __tuple_assignable_imp<__tuple_types<_Tp0, _Tp...>, __tuple_types<_Up0, _Up...> >
: public integral_constant<bool,
is_assignable<_Up0&, _Tp0>::value &&
__tuple_assignable_imp<__tuple_types<_Tp...>, __tuple_types<_Up...> >::value> {};
template <>
struct __tuple_assignable_imp<__tuple_types<>, __tuple_types<> >
: public true_type {};
template <bool, class, class>
struct __tuple_assignable_apply : public false_type {};
template <class _Tp, class _Up>
struct __tuple_assignable_apply<true, _Tp, _Up>
: __tuple_assignable_imp<
typename __make_tuple_types<_Tp>::type
, typename __make_tuple_types<_Up>::type
>
{};
template <class _Tp, class _Up, bool = __tuple_like<typename remove_reference<_Tp>::type>::value,
bool = __tuple_like<_Up>::value>
struct __tuple_assignable
: public false_type {};
template <class _Tp, class _Up>
struct __tuple_assignable<_Tp, _Up, true, true>
: public __tuple_assignable_apply<tuple_size<typename remove_reference<_Tp>::type>::value ==
tuple_size<_Up>::value, _Tp, _Up>
{};
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_HAS_NO_VARIADICS
#endif // _LIBCPP___TUPLE
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