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freebsd/contrib/libc++/include/optional
T
Dimitry Andric e8948c9522 Merge clang, llvm, lld, lldb, compiler-rt and libc++ 5.0.0 release. 
MFC r309126 (by emaste):

  Correct lld llvm-tblgen dependency file name

MFC r309169:

  Get rid of separate Subversion mergeinfo properties for llvm-dwarfdump
  and llvm-lto.  The mergeinfo confuses Subversion enormously, and these
  directories will just use the mergeinfo for llvm itself.

MFC r312765:

  Pull in r276136 from upstream llvm trunk (by Wei Mi):

    Use ValueOffsetPair to enhance value reuse during SCEV expansion.

    In D12090, the ExprValueMap was added to reuse existing value during
    SCEV expansion. However, const folding and sext/zext distribution can
    make the reuse still difficult.

    A simplified case is: suppose we know S1 expands to V1 in
    ExprValueMap, and
      S1 = S2 + C_a
      S3 = S2 + C_b
    where C_a and C_b are different SCEVConstants. Then we'd like to
    expand S3 as V1 - C_a + C_b instead of expanding S2 literally. It is
    helpful when S2 is a complex SCEV expr and S2 has no entry in
    ExprValueMap, which is usually caused by the fact that S3 is
    generated from S1 after const folding.

    In order to do that, we represent ExprValueMap as a mapping from SCEV
    to ValueOffsetPair. We will save both S1->{V1, 0} and S2->{V1, C_a}
    into the ExprValueMap when we create SCEV for V1. When S3 is
    expanded, it will first expand S2 to V1 - C_a because of S2->{V1,
    C_a} in the map, then expand S3 to V1 - C_a + C_b.

    Differential Revision: https://reviews.llvm.org/D21313

  This should fix assertion failures when building OpenCV >= 3.1.

  PR:		215649

MFC r312831:

  Revert r312765 for now, since it causes assertions when building
  lang/spidermonkey24.

  Reported by:	antoine
  PR:		215649

MFC r316511 (by jhb):

  Add an implementation of __ffssi2() derived from __ffsdi2().

  Newer versions of GCC include an __ffssi2() symbol in libgcc and the
  compiler can emit calls to it in generated code.  This is true for at
  least GCC 6.2 when compiling world for mips and mips64.

  Reviewed by:	jmallett, dim
  Sponsored by:	DARPA / AFRL
  Differential Revision:	https://reviews.freebsd.org/D10086

MFC r318601 (by adrian):

  [libcompiler-rt] add bswapdi2/bswapsi2

  This is required for mips gcc 6.3 userland to build/run.

  Reviewed by:	emaste, dim
  Approved by:	emaste
  Differential Revision:	https://reviews.freebsd.org/D10838

MFC r318884 (by emaste):

  lldb: map TRAP_CAP to a trace trap

  In the absense of a more specific handler for TRAP_CAP (generated by
  ENOTCAPABLE or ECAPMODE while in capability mode) treat it as a trace
  trap.

  Example usage (testing the bug in PR219173):

  % proccontrol -m trapcap lldb usr.bin/hexdump/obj/hexdump -- -Cv -s 1 /bin/ls
  ...
  (lldb) run
  Process 12980 launching
  Process 12980 launched: '.../usr.bin/hexdump/obj/hexdump' (x86_64)
  Process 12980 stopped
  * thread #1, stop reason = trace
      frame #0: 0x0000004b80c65f1a libc.so.7`__sys_lseek + 10
  ...

  In the future we should have LLDB control the trapcap procctl itself
  (as it does with ASLR), as well as report a specific stop reason.
  This change eliminates an assertion failure from LLDB for now.

MFC r319796:

  Remove a few unneeded files from libllvm, libclang and liblldb.

MFC r319885 (by emaste):

  lld: ELF: Fix ICF crash on absolute symbol relocations.

  If two sections contained relocations to absolute symbols with the same
  value we would crash when trying to access their sections. Add a check that
  both symbols point to sections before accessing their sections, and treat
  absolute symbols as equal if their values are equal.

  Obtained from:	LLD commit r292578

MFC r319918:

  Revert r319796 for now, it can cause undefined references when linking
  in some circumstances.

  Reported by:	Shawn Webb <[email protected]>

MFC r319957 (by emaste):

  lld: Add armelf emulation mode

  Obtained from:	LLD r305375

MFC r321369:

  Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
  5.0.0 (trunk r308421).  Upstream has branched for the 5.0.0 release,
  which should be in about a month.  Please report bugs and regressions,
  so we can get them into the release.

  Please note that from 3.5.0 onwards, clang, llvm and lldb require C++11
  support to build; see UPDATING for more information.

MFC r321420:

  Add a few more object files to liblldb, which should solve errors when
  linking the lldb executable in some cases.  In particular, when the
  -ffunction-sections -fdata-sections options are turned off, or
  ineffective.

  Reported by:	Shawn Webb, Mark Millard

MFC r321433:

  Cleanup stale Options.inc files from the previous libllvm build for
  clang 4.0.0.  Otherwise, these can get included before the two newly
  generated ones (which are different) for clang 5.0.0.

  Reported by:	Mark Millard

MFC r321439 (by bdrewery):

  Move llvm Options.inc hack from r321433 for NO_CLEAN to lib/clang/libllvm.

  The files are only ever generated to .OBJDIR, not to WORLDTMP (as a
  sysroot) and are only ever included from a compilation.  So using
  a beforebuild target here removes the file before the compilation
  tries to include it.

MFC r321664:

  Pull in r308891 from upstream llvm trunk (by Benjamin Kramer):

    [CodeGenPrepare] Cut off FindAllMemoryUses if there are too many uses.

    This avoids excessive compile time. The case I'm looking at is
    Function.cpp from an old version of LLVM that still had the giant
    memcmp string matcher in it. Before r308322 this compiled in about 2
    minutes, after it, clang takes infinite* time to compile it. With
    this patch we're at 5 min, which is still bad but this is a
    pathological case.

    The cut off at 20 uses was chosen by looking at other cut-offs in LLVM
    for user scanning. It's probably too high, but does the job and is
    very unlikely to regress anything.

    Fixes PR33900.

    * I'm impatient and aborted after 15 minutes, on the bug report it was
      killed after 2h.

  Pull in r308986 from upstream llvm trunk (by Simon Pilgrim):

    [X86][CGP] Reduce memcmp() expansion to 2 load pairs (PR33914)

    D35067/rL308322 attempted to support up to 4 load pairs for memcmp
    inlining which resulted in regressions for some optimized libc memcmp
    implementations (PR33914).

    Until we can match these more optimal cases, this patch reduces the
    memcmp expansion to a maximum of 2 load pairs (which matches what we
    do for -Os).

    This patch should be considered for the 5.0.0 release branch as well

    Differential Revision: https://reviews.llvm.org/D35830

  These fix a hang (or extremely long compile time) when building older
  LLVM ports.

  Reported by:    antoine
  PR:             219139

MFC r321719:

  Pull in r309503 from upstream clang trunk (by Richard Smith):

    PR33902: Invalidate line number cache when adding more text to
    existing buffer.

    This led to crashes as the line number cache would report a bogus
    line number for a line of code, and we'd try to find a nonexistent
    column within the line when printing diagnostics.

  This fixes an assertion when building the graphics/champlain port.

  Reported by:	antoine, kwm
  PR:		219139

MFC r321723:

  Upgrade our copies of clang, llvm, lld and lldb to r309439 from the
  upstream release_50 branch.  This is just after upstream's 5.0.0-rc1.

MFC r322320:

  Upgrade our copies of clang, llvm and libc++ to r310316 from the
  upstream release_50 branch.

MFC r322326 (by emaste):

  lldb: Make i386-*-freebsd expression work on JIT path

  * Enable i386 ABI creation for freebsd
  * Added an extra argument in ABISysV_i386::PrepareTrivialCall for mmap
    syscall
  * Unlike linux, the last argument of mmap is actually 64-bit(off_t).
    This requires us to push an additional word for the higher order bits.
  * Prior to this change, ktrace dump will show mmap failures due to
    invalid argument coming from the 6th mmap argument.

  Submitted by:	Karnajit Wangkhem
  Differential Revision:	https://reviews.llvm.org/D34776

MFC r322360 (by emaste):

  lldb: Report inferior signals as signals, not exceptions, on FreeBSD

  This is the FreeBSD equivalent of LLVM r238549.

  This serves 2 purposes:

  * LLDB should handle inferior process signals SIGSEGV/SIGILL/SIGBUS/
    SIGFPE the way it is suppose to be handled. Prior to this fix these
    signals will neither create a coredump, nor exit from the debugger
    or work for signal handling scenario.
  * eInvalidCrashReason need not report "unknown crash reason" if we have
    a valid si_signo

  llvm.org/pr23699

  Patch by Karnajit Wangkhem

  Differential Revision:  https://reviews.llvm.org/D35223

  Submitted by:	Karnajit Wangkhem
  Obtained from:	LLVM r310591

MFC r322474 (by emaste):

  lld: Add `-z muldefs` option.

  Obtained from:	LLVM r310757

MFC r322740:

  Upgrade our copies of clang, llvm, lld and libc++ to r311219 from the
  upstream release_50 branch.

MFC r322855:

  Upgrade our copies of clang, llvm, lldb and compiler-rt to r311606 from
  the upstream release_50 branch.

  As of this version, lib/msun's trig test should also work correctly
  again (see bug 220989 for more information).

  PR:		220989

MFC r323112:

  Upgrade our copies of clang, llvm, lldb and compiler-rt to r312293 from
  the upstream release_50 branch.  This corresponds to 5.0.0 rc4.

  As of this version, the cad/stepcode port should now compile in a more
  reasonable time on i386 (see bug 221836 for more information).

  PR:		221836

MFC r323245:

  Upgrade our copies of clang, llvm, lld, lldb, compiler-rt and libc++ to
  5.0.0 release (upstream r312559).

  Release notes for llvm, clang and lld will be available here soon:
  <http://releases.llvm.org/5.0.0/docs/ReleaseNotes.html>
  <http://releases.llvm.org/5.0.0/tools/clang/docs/ReleaseNotes.html>
  <http://releases.llvm.org/5.0.0/tools/lld/docs/ReleaseNotes.html>

  Relnotes:	yes
2017-09-26 19:56:36 +00:00

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// -*- C++ -*-
//===-------------------------- optional ----------------------------------===//
//
// 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_OPTIONAL
#define _LIBCPP_OPTIONAL
/*
optional synopsis
// C++1z
namespace std {
// 23.6.3, optional for object types
template <class T> class optional;
// 23.6.4, no-value state indicator
struct nullopt_t{see below };
constexpr nullopt_t nullopt(unspecified );
// 23.6.5, class bad_optional_access
class bad_optional_access;
// 23.6.6, relational operators
template <class T, class U>
constexpr bool operator==(const optional<T>&, const optional<U>&);
template <class T, class U>
constexpr bool operator!=(const optional<T>&, const optional<U>&);
template <class T, class U>
constexpr bool operator<(const optional<T>&, const optional<U>&);
template <class T, class U>
constexpr bool operator>(const optional<T>&, const optional<U>&);
template <class T, class U>
constexpr bool operator<=(const optional<T>&, const optional<U>&);
template <class T, class U>
constexpr bool operator>=(const optional<T>&, const optional<U>&);
// 23.6.7 comparison with nullopt
template <class T> constexpr bool operator==(const optional<T>&, nullopt_t) noexcept;
template <class T> constexpr bool operator==(nullopt_t, const optional<T>&) noexcept;
template <class T> constexpr bool operator!=(const optional<T>&, nullopt_t) noexcept;
template <class T> constexpr bool operator!=(nullopt_t, const optional<T>&) noexcept;
template <class T> constexpr bool operator<(const optional<T>&, nullopt_t) noexcept;
template <class T> constexpr bool operator<(nullopt_t, const optional<T>&) noexcept;
template <class T> constexpr bool operator<=(const optional<T>&, nullopt_t) noexcept;
template <class T> constexpr bool operator<=(nullopt_t, const optional<T>&) noexcept;
template <class T> constexpr bool operator>(const optional<T>&, nullopt_t) noexcept;
template <class T> constexpr bool operator>(nullopt_t, const optional<T>&) noexcept;
template <class T> constexpr bool operator>=(const optional<T>&, nullopt_t) noexcept;
template <class T> constexpr bool operator>=(nullopt_t, const optional<T>&) noexcept;
// 23.6.8, comparison with T
template <class T, class U> constexpr bool operator==(const optional<T>&, const U&);
template <class T, class U> constexpr bool operator==(const U&, const optional<T>&);
template <class T, class U> constexpr bool operator!=(const optional<T>&, const U&);
template <class T, class U> constexpr bool operator!=(const U&, const optional<T>&);
template <class T, class U> constexpr bool operator<(const optional<T>&, const U&);
template <class T, class U> constexpr bool operator<(const U&, const optional<T>&);
template <class T, class U> constexpr bool operator<=(const optional<T>&, const U&);
template <class T, class U> constexpr bool operator<=(const U&, const optional<T>&);
template <class T, class U> constexpr bool operator>(const optional<T>&, const U&);
template <class T, class U> constexpr bool operator>(const U&, const optional<T>&);
template <class T, class U> constexpr bool operator>=(const optional<T>&, const U&);
template <class T, class U> constexpr bool operator>=(const U&, const optional<T>&);
// 23.6.9, specialized algorithms
template <class T> void swap(optional<T>&, optional<T>&) noexcept(see below );
template <class T> constexpr optional<see below > make_optional(T&&);
template <class T, class... Args>
constexpr optional<T> make_optional(Args&&... args);
template <class T, class U, class... Args>
constexpr optional<T> make_optional(initializer_list<U> il, Args&&... args);
// 23.6.10, hash support
template <class T> struct hash;
template <class T> struct hash<optional<T>>;
template <class T> class optional {
public:
using value_type = T;
// 23.6.3.1, constructors
constexpr optional() noexcept;
constexpr optional(nullopt_t) noexcept;
optional(const optional &);
optional(optional &&) noexcept(see below);
template <class... Args> constexpr explicit optional(in_place_t, Args &&...);
template <class U, class... Args>
constexpr explicit optional(in_place_t, initializer_list<U>, Args &&...);
template <class U = T>
constexpr EXPLICIT optional(U &&);
template <class U>
constexpr EXPLICIT optional(const optional<U> &);
template <class U>
constexpr EXPLICIT optional(optional<U> &&);
// 23.6.3.2, destructor
~optional();
// 23.6.3.3, assignment
optional &operator=(nullopt_t) noexcept;
optional &operator=(const optional &);
optional &operator=(optional &&) noexcept(see below );
template <class U = T> optional &operator=(U &&);
template <class U> optional &operator=(const optional<U> &);
template <class U> optional &operator=(optional<U> &&);
template <class... Args> T& emplace(Args &&...);
template <class U, class... Args>
T& emplace(initializer_list<U>, Args &&...);
// 23.6.3.4, swap
void swap(optional &) noexcept(see below );
// 23.6.3.5, observers
constexpr T const *operator->() const;
constexpr T *operator->();
constexpr T const &operator*() const &;
constexpr T &operator*() &;
constexpr T &&operator*() &&;
constexpr const T &&operator*() const &&;
constexpr explicit operator bool() const noexcept;
constexpr bool has_value() const noexcept;
constexpr T const &value() const &;
constexpr T &value() &;
constexpr T &&value() &&;
constexpr const T &&value() const &&;
template <class U> constexpr T value_or(U &&) const &;
template <class U> constexpr T value_or(U &&) &&;
// 23.6.3.6, modifiers
void reset() noexcept;
private:
T *val; // exposition only
};
} // namespace std
*/
#include <__config>
#include <__debug>
#include <__functional_base>
#include <functional>
#include <initializer_list>
#include <new>
#include <stdexcept>
#include <type_traits>
#include <utility>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_PUSH_MACROS
#include <__undef_macros>
namespace std // purposefully not using versioning namespace
{
class _LIBCPP_EXCEPTION_ABI bad_optional_access
: public exception
{
public:
// Get the key function ~bad_optional_access() into the dylib
virtual ~bad_optional_access() _NOEXCEPT;
virtual const char* what() const _NOEXCEPT;
};
} // std
#if _LIBCPP_STD_VER > 14
_LIBCPP_BEGIN_NAMESPACE_STD
_LIBCPP_NORETURN
inline _LIBCPP_INLINE_VISIBILITY
void __throw_bad_optional_access() {
#ifndef _LIBCPP_NO_EXCEPTIONS
throw bad_optional_access();
#else
_VSTD::abort();
#endif
}
struct nullopt_t
{
struct __secret_tag { _LIBCPP_INLINE_VISIBILITY explicit __secret_tag() = default; };
_LIBCPP_INLINE_VISIBILITY constexpr explicit nullopt_t(__secret_tag, __secret_tag) noexcept {}
};
/* inline */ constexpr nullopt_t nullopt{nullopt_t::__secret_tag{}, nullopt_t::__secret_tag{}};
template <class _Tp, bool = is_trivially_destructible<_Tp>::value>
struct __optional_destruct_base;
template <class _Tp>
struct __optional_destruct_base<_Tp, false>
{
typedef _Tp value_type;
static_assert(is_object_v<value_type>,
"instantiation of optional with a non-object type is undefined behavior");
union
{
char __null_state_;
value_type __val_;
};
bool __engaged_;
_LIBCPP_INLINE_VISIBILITY
~__optional_destruct_base()
{
if (__engaged_)
__val_.~value_type();
}
_LIBCPP_INLINE_VISIBILITY
constexpr __optional_destruct_base() noexcept
: __null_state_(),
__engaged_(false) {}
template <class... _Args>
_LIBCPP_INLINE_VISIBILITY
constexpr explicit __optional_destruct_base(in_place_t, _Args&&... __args)
: __val_(_VSTD::forward<_Args>(__args)...),
__engaged_(true) {}
_LIBCPP_INLINE_VISIBILITY
void reset() noexcept
{
if (__engaged_)
{
__val_.~value_type();
__engaged_ = false;
}
}
};
template <class _Tp>
struct __optional_destruct_base<_Tp, true>
{
typedef _Tp value_type;
static_assert(is_object_v<value_type>,
"instantiation of optional with a non-object type is undefined behavior");
union
{
char __null_state_;
value_type __val_;
};
bool __engaged_;
_LIBCPP_INLINE_VISIBILITY
constexpr __optional_destruct_base() noexcept
: __null_state_(),
__engaged_(false) {}
template <class... _Args>
_LIBCPP_INLINE_VISIBILITY
constexpr explicit __optional_destruct_base(in_place_t, _Args&&... __args)
: __val_(_VSTD::forward<_Args>(__args)...),
__engaged_(true) {}
_LIBCPP_INLINE_VISIBILITY
void reset() noexcept
{
if (__engaged_)
{
__engaged_ = false;
}
}
};
template <class _Tp, bool = is_reference<_Tp>::value>
struct __optional_storage_base : __optional_destruct_base<_Tp>
{
using __base = __optional_destruct_base<_Tp>;
using value_type = _Tp;
using __base::__base;
_LIBCPP_INLINE_VISIBILITY
constexpr bool has_value() const noexcept
{
return this->__engaged_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr value_type& __get() & noexcept
{
return this->__val_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr const value_type& __get() const& noexcept
{
return this->__val_;
}
_LIBCPP_INLINE_VISIBILITY
constexpr value_type&& __get() && noexcept
{
return _VSTD::move(this->__val_);
}
_LIBCPP_INLINE_VISIBILITY
constexpr const value_type&& __get() const&& noexcept
{
return _VSTD::move(this->__val_);
}
template <class... _Args>
_LIBCPP_INLINE_VISIBILITY
void __construct(_Args&&... __args)
{
_LIBCPP_ASSERT(!has_value(), "__construct called for engaged __optional_storage");
::new((void*)_VSTD::addressof(this->__val_)) value_type(_VSTD::forward<_Args>(__args)...);
this->__engaged_ = true;
}
template <class _That>
_LIBCPP_INLINE_VISIBILITY
void __construct_from(_That&& __opt)
{
if (__opt.has_value())
__construct(_VSTD::forward<_That>(__opt).__get());
}
template <class _That>
_LIBCPP_INLINE_VISIBILITY
void __assign_from(_That&& __opt)
{
if (this->__engaged_ == __opt.has_value())
{
if (this->__engaged_)
this->__val_ = _VSTD::forward<_That>(__opt).__get();
}
else
{
if (this->__engaged_)
this->reset();
else
__construct(_VSTD::forward<_That>(__opt).__get());
}
}
};
// optional<T&> is currently required ill-formed, however it may to be in the
// future. For this reason it has already been implemented to ensure we can
// make the change in an ABI compatible manner.
template <class _Tp>
struct __optional_storage_base<_Tp, true>
{
using value_type = _Tp;
using __raw_type = remove_reference_t<_Tp>;
__raw_type* __value_;
template <class _Up>
static constexpr bool __can_bind_reference() {
using _RawUp = typename remove_reference<_Up>::type;
using _UpPtr = _RawUp*;
using _RawTp = typename remove_reference<_Tp>::type;
using _TpPtr = _RawTp*;
using _CheckLValueArg = integral_constant<bool,
(is_lvalue_reference<_Up>::value && is_convertible<_UpPtr, _TpPtr>::value)
|| is_same<_RawUp, reference_wrapper<_RawTp>>::value
|| is_same<_RawUp, reference_wrapper<typename remove_const<_RawTp>::type>>::value
>;
return (is_lvalue_reference<_Tp>::value && _CheckLValueArg::value)
|| (is_rvalue_reference<_Tp>::value && !is_lvalue_reference<_Up>::value &&
is_convertible<_UpPtr, _TpPtr>::value);
}
_LIBCPP_INLINE_VISIBILITY
constexpr __optional_storage_base() noexcept
: __value_(nullptr) {}
template <class _UArg>
_LIBCPP_INLINE_VISIBILITY
constexpr explicit __optional_storage_base(in_place_t, _UArg&& __uarg)
: __value_(_VSTD::addressof(__uarg))
{
static_assert(__can_bind_reference<_UArg>(),
"Attempted to construct a reference element in tuple from a "
"possible temporary");
}
_LIBCPP_INLINE_VISIBILITY
void reset() noexcept { __value_ = nullptr; }
_LIBCPP_INLINE_VISIBILITY
constexpr bool has_value() const noexcept
{ return __value_ != nullptr; }
_LIBCPP_INLINE_VISIBILITY
constexpr value_type& __get() const& noexcept
{ return *__value_; }
_LIBCPP_INLINE_VISIBILITY
constexpr value_type&& __get() const&& noexcept
{ return _VSTD::forward<value_type>(*__value_); }
template <class _UArg>
_LIBCPP_INLINE_VISIBILITY
void __construct(_UArg&& __val)
{
_LIBCPP_ASSERT(!has_value(), "__construct called for engaged __optional_storage");
static_assert(__can_bind_reference<_UArg>(),
"Attempted to construct a reference element in tuple from a "
"possible temporary");
__value_ = _VSTD::addressof(__val);
}
template <class _That>
_LIBCPP_INLINE_VISIBILITY
void __construct_from(_That&& __opt)
{
if (__opt.has_value())
__construct(_VSTD::forward<_That>(__opt).__get());
}
template <class _That>
_LIBCPP_INLINE_VISIBILITY
void __assign_from(_That&& __opt)
{
if (has_value() == __opt.has_value())
{
if (has_value())
*__value_ = _VSTD::forward<_That>(__opt).__get();
}
else
{
if (has_value())
reset();
else
__construct(_VSTD::forward<_That>(__opt).__get());
}
}
};
template <class _Tp, bool = is_trivially_copy_constructible<_Tp>::value>
struct __optional_copy_base : __optional_storage_base<_Tp>
{
using __optional_storage_base<_Tp>::__optional_storage_base;
};
template <class _Tp>
struct __optional_copy_base<_Tp, false> : __optional_storage_base<_Tp>
{
using __optional_storage_base<_Tp>::__optional_storage_base;
_LIBCPP_INLINE_VISIBILITY
__optional_copy_base() = default;
_LIBCPP_INLINE_VISIBILITY
__optional_copy_base(const __optional_copy_base& __opt)
{
this->__construct_from(__opt);
}
_LIBCPP_INLINE_VISIBILITY
__optional_copy_base(__optional_copy_base&&) = default;
_LIBCPP_INLINE_VISIBILITY
__optional_copy_base& operator=(const __optional_copy_base&) = default;
_LIBCPP_INLINE_VISIBILITY
__optional_copy_base& operator=(__optional_copy_base&&) = default;
};
template <class _Tp, bool = is_trivially_move_constructible<_Tp>::value>
struct __optional_move_base : __optional_copy_base<_Tp>
{
using __optional_copy_base<_Tp>::__optional_copy_base;
};
template <class _Tp>
struct __optional_move_base<_Tp, false> : __optional_copy_base<_Tp>
{
using value_type = _Tp;
using __optional_copy_base<_Tp>::__optional_copy_base;
_LIBCPP_INLINE_VISIBILITY
__optional_move_base() = default;
_LIBCPP_INLINE_VISIBILITY
__optional_move_base(const __optional_move_base&) = default;
_LIBCPP_INLINE_VISIBILITY
__optional_move_base(__optional_move_base&& __opt)
noexcept(is_nothrow_move_constructible_v<value_type>)
{
this->__construct_from(_VSTD::move(__opt));
}
_LIBCPP_INLINE_VISIBILITY
__optional_move_base& operator=(const __optional_move_base&) = default;
_LIBCPP_INLINE_VISIBILITY
__optional_move_base& operator=(__optional_move_base&&) = default;
};
template <class _Tp, bool =
is_trivially_destructible<_Tp>::value &&
is_trivially_copy_constructible<_Tp>::value &&
is_trivially_copy_assignable<_Tp>::value>
struct __optional_copy_assign_base : __optional_move_base<_Tp>
{
using __optional_move_base<_Tp>::__optional_move_base;
};
template <class _Tp>
struct __optional_copy_assign_base<_Tp, false> : __optional_move_base<_Tp>
{
using __optional_move_base<_Tp>::__optional_move_base;
_LIBCPP_INLINE_VISIBILITY
__optional_copy_assign_base() = default;
_LIBCPP_INLINE_VISIBILITY
__optional_copy_assign_base(const __optional_copy_assign_base&) = default;
_LIBCPP_INLINE_VISIBILITY
__optional_copy_assign_base(__optional_copy_assign_base&&) = default;
_LIBCPP_INLINE_VISIBILITY
__optional_copy_assign_base& operator=(const __optional_copy_assign_base& __opt)
{
this->__assign_from(__opt);
return *this;
}
_LIBCPP_INLINE_VISIBILITY
__optional_copy_assign_base& operator=(__optional_copy_assign_base&&) = default;
};
template <class _Tp, bool =
is_trivially_destructible<_Tp>::value &&
is_trivially_move_constructible<_Tp>::value &&
is_trivially_move_assignable<_Tp>::value>
struct __optional_move_assign_base : __optional_copy_assign_base<_Tp>
{
using __optional_copy_assign_base<_Tp>::__optional_copy_assign_base;
};
template <class _Tp>
struct __optional_move_assign_base<_Tp, false> : __optional_copy_assign_base<_Tp>
{
using value_type = _Tp;
using __optional_copy_assign_base<_Tp>::__optional_copy_assign_base;
_LIBCPP_INLINE_VISIBILITY
__optional_move_assign_base() = default;
_LIBCPP_INLINE_VISIBILITY
__optional_move_assign_base(const __optional_move_assign_base& __opt) = default;
_LIBCPP_INLINE_VISIBILITY
__optional_move_assign_base(__optional_move_assign_base&&) = default;
_LIBCPP_INLINE_VISIBILITY
__optional_move_assign_base& operator=(const __optional_move_assign_base&) = default;
_LIBCPP_INLINE_VISIBILITY
__optional_move_assign_base& operator=(__optional_move_assign_base&& __opt)
noexcept(is_nothrow_move_assignable_v<value_type> &&
is_nothrow_move_constructible_v<value_type>)
{
this->__assign_from(_VSTD::move(__opt));
return *this;
}
};
template <class _Tp>
using __optional_sfinae_ctor_base_t = __sfinae_ctor_base<
is_copy_constructible<_Tp>::value,
is_move_constructible<_Tp>::value
>;
template <class _Tp>
using __optional_sfinae_assign_base_t = __sfinae_assign_base<
(is_copy_constructible<_Tp>::value && is_copy_assignable<_Tp>::value),
(is_move_constructible<_Tp>::value && is_move_assignable<_Tp>::value)
>;
template <class _Tp>
class optional
: private __optional_move_assign_base<_Tp>
, private __optional_sfinae_ctor_base_t<_Tp>
, private __optional_sfinae_assign_base_t<_Tp>
{
using __base = __optional_move_assign_base<_Tp>;
public:
using value_type = _Tp;
private:
// Disable the reference extension using this static assert.
static_assert(!is_same_v<value_type, in_place_t>,
"instantiation of optional with in_place_t is ill-formed");
static_assert(!is_same_v<__uncvref_t<value_type>, nullopt_t>,
"instantiation of optional with nullopt_t is ill-formed");
static_assert(!is_reference_v<value_type>,
"instantiation of optional with a reference type is ill-formed");
static_assert(is_destructible_v<value_type>,
"instantiation of optional with a non-destructible type is ill-formed");
// LWG2756: conditionally explicit conversion from _Up
struct _CheckOptionalArgsConstructor {
template <class _Up>
static constexpr bool __enable_implicit() {
return is_constructible_v<_Tp, _Up&&> &&
is_convertible_v<_Up&&, _Tp>;
}
template <class _Up>
static constexpr bool __enable_explicit() {
return is_constructible_v<_Tp, _Up&&> &&
!is_convertible_v<_Up&&, _Tp>;
}
};
template <class _Up>
using _CheckOptionalArgsCtor = conditional_t<
!is_same_v<decay_t<_Up>, in_place_t> &&
!is_same_v<decay_t<_Up>, optional>,
_CheckOptionalArgsConstructor,
__check_tuple_constructor_fail
>;
template <class _QualUp>
struct _CheckOptionalLikeConstructor {
template <class _Up, class _Opt = optional<_Up>>
using __check_constructible_from_opt = __lazy_or<
is_constructible<_Tp, _Opt&>,
is_constructible<_Tp, _Opt const&>,
is_constructible<_Tp, _Opt&&>,
is_constructible<_Tp, _Opt const&&>,
is_convertible<_Opt&, _Tp>,
is_convertible<_Opt const&, _Tp>,
is_convertible<_Opt&&, _Tp>,
is_convertible<_Opt const&&, _Tp>
>;
template <class _Up, class _Opt = optional<_Up>>
using __check_assignable_from_opt = __lazy_or<
is_assignable<_Tp&, _Opt&>,
is_assignable<_Tp&, _Opt const&>,
is_assignable<_Tp&, _Opt&&>,
is_assignable<_Tp&, _Opt const&&>
>;
template <class _Up, class _QUp = _QualUp>
static constexpr bool __enable_implicit() {
return is_convertible<_QUp, _Tp>::value &&
!__check_constructible_from_opt<_Up>::value;
}
template <class _Up, class _QUp = _QualUp>
static constexpr bool __enable_explicit() {
return !is_convertible<_QUp, _Tp>::value &&
!__check_constructible_from_opt<_Up>::value;
}
template <class _Up, class _QUp = _QualUp>
static constexpr bool __enable_assign() {
// Construction and assignability of _Qup to _Tp has already been
// checked.
return !__check_constructible_from_opt<_Up>::value &&
!__check_assignable_from_opt<_Up>::value;
}
};
template <class _Up, class _QualUp>
using _CheckOptionalLikeCtor = conditional_t<
__lazy_and<
__lazy_not<is_same<_Up, _Tp>>,
is_constructible<_Tp, _QualUp>
>::value,
_CheckOptionalLikeConstructor<_QualUp>,
__check_tuple_constructor_fail
>;
template <class _Up, class _QualUp>
using _CheckOptionalLikeAssign = conditional_t<
__lazy_and<
__lazy_not<is_same<_Up, _Tp>>,
is_constructible<_Tp, _QualUp>,
is_assignable<_Tp&, _QualUp>
>::value,
_CheckOptionalLikeConstructor<_QualUp>,
__check_tuple_constructor_fail
>;
public:
_LIBCPP_INLINE_VISIBILITY constexpr optional() noexcept {}
_LIBCPP_INLINE_VISIBILITY constexpr optional(const optional&) = default;
_LIBCPP_INLINE_VISIBILITY constexpr optional(optional&&) = default;
_LIBCPP_INLINE_VISIBILITY constexpr optional(nullopt_t) noexcept {}
template <class... _Args, class = enable_if_t<
is_constructible_v<value_type, _Args...>>
>
_LIBCPP_INLINE_VISIBILITY
constexpr explicit optional(in_place_t, _Args&&... __args)
: __base(in_place, _VSTD::forward<_Args>(__args)...) {}
template <class _Up, class... _Args, class = enable_if_t<
is_constructible_v<value_type, initializer_list<_Up>&, _Args...>>
>
_LIBCPP_INLINE_VISIBILITY
constexpr explicit optional(in_place_t, initializer_list<_Up> __il, _Args&&... __args)
: __base(in_place, __il, _VSTD::forward<_Args>(__args)...) {}
template <class _Up = value_type, enable_if_t<
_CheckOptionalArgsCtor<_Up>::template __enable_implicit<_Up>()
, int> = 0>
_LIBCPP_INLINE_VISIBILITY
constexpr optional(_Up&& __v)
: __base(in_place, _VSTD::forward<_Up>(__v)) {}
template <class _Up, enable_if_t<
_CheckOptionalArgsCtor<_Up>::template __enable_explicit<_Up>()
, int> = 0>
_LIBCPP_INLINE_VISIBILITY
constexpr explicit optional(_Up&& __v)
: __base(in_place, _VSTD::forward<_Up>(__v)) {}
// LWG2756: conditionally explicit conversion from const optional<_Up>&
template <class _Up, enable_if_t<
_CheckOptionalLikeCtor<_Up, _Up const&>::template __enable_implicit<_Up>()
, int> = 0>
_LIBCPP_INLINE_VISIBILITY
optional(const optional<_Up>& __v)
{
this->__construct_from(__v);
}
template <class _Up, enable_if_t<
_CheckOptionalLikeCtor<_Up, _Up const&>::template __enable_explicit<_Up>()
, int> = 0>
_LIBCPP_INLINE_VISIBILITY
explicit optional(const optional<_Up>& __v)
{
this->__construct_from(__v);
}
// LWG2756: conditionally explicit conversion from optional<_Up>&&
template <class _Up, enable_if_t<
_CheckOptionalLikeCtor<_Up, _Up &&>::template __enable_implicit<_Up>()
, int> = 0>
_LIBCPP_INLINE_VISIBILITY
optional(optional<_Up>&& __v)
{
this->__construct_from(_VSTD::move(__v));
}
template <class _Up, enable_if_t<
_CheckOptionalLikeCtor<_Up, _Up &&>::template __enable_explicit<_Up>()
, int> = 0>
_LIBCPP_INLINE_VISIBILITY
explicit optional(optional<_Up>&& __v)
{
this->__construct_from(_VSTD::move(__v));
}
_LIBCPP_INLINE_VISIBILITY
optional& operator=(nullopt_t) noexcept
{
reset();
return *this;
}
_LIBCPP_INLINE_VISIBILITY optional& operator=(const optional&) = default;
_LIBCPP_INLINE_VISIBILITY optional& operator=(optional&&) = default;
// LWG2756
template <class _Up = value_type,
class = enable_if_t
<__lazy_and<
integral_constant<bool,
!is_same_v<decay_t<_Up>, optional> &&
!(is_same_v<_Up, value_type> && is_scalar_v<value_type>)
>,
is_constructible<value_type, _Up>,
is_assignable<value_type&, _Up>
>::value>
>
_LIBCPP_INLINE_VISIBILITY
optional&
operator=(_Up&& __v)
{
if (this->has_value())
this->__get() = _VSTD::forward<_Up>(__v);
else
this->__construct(_VSTD::forward<_Up>(__v));
return *this;
}
// LWG2756
template <class _Up, enable_if_t<
_CheckOptionalLikeAssign<_Up, _Up const&>::template __enable_assign<_Up>()
, int> = 0>
_LIBCPP_INLINE_VISIBILITY
optional&
operator=(const optional<_Up>& __v)
{
this->__assign_from(__v);
return *this;
}
// LWG2756
template <class _Up, enable_if_t<
_CheckOptionalLikeCtor<_Up, _Up &&>::template __enable_assign<_Up>()
, int> = 0>
_LIBCPP_INLINE_VISIBILITY
optional&
operator=(optional<_Up>&& __v)
{
this->__assign_from(_VSTD::move(__v));
return *this;
}
template <class... _Args,
class = enable_if_t
<
is_constructible_v<value_type, _Args...>
>
>
_LIBCPP_INLINE_VISIBILITY
_Tp &
emplace(_Args&&... __args)
{
reset();
this->__construct(_VSTD::forward<_Args>(__args)...);
return this->__get();
}
template <class _Up, class... _Args,
class = enable_if_t
<
is_constructible_v<value_type, initializer_list<_Up>&, _Args...>
>
>
_LIBCPP_INLINE_VISIBILITY
_Tp &
emplace(initializer_list<_Up> __il, _Args&&... __args)
{
reset();
this->__construct(__il, _VSTD::forward<_Args>(__args)...);
return this->__get();
}
_LIBCPP_INLINE_VISIBILITY
void swap(optional& __opt)
noexcept(is_nothrow_move_constructible_v<value_type> &&
is_nothrow_swappable_v<value_type>)
{
if (this->has_value() == __opt.has_value())
{
using _VSTD::swap;
if (this->has_value())
swap(this->__get(), __opt.__get());
}
else
{
if (this->has_value())
{
__opt.__construct(_VSTD::move(this->__get()));
reset();
}
else
{
this->__construct(_VSTD::move(__opt.__get()));
__opt.reset();
}
}
}
_LIBCPP_INLINE_VISIBILITY
constexpr
add_pointer_t<value_type const>
operator->() const
{
_LIBCPP_ASSERT(this->has_value(), "optional operator-> called for disengaged value");
#ifndef _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF
return _VSTD::addressof(this->__get());
#else
return __operator_arrow(__has_operator_addressof<value_type>{}, this->__get());
#endif
}
_LIBCPP_INLINE_VISIBILITY
constexpr
add_pointer_t<value_type>
operator->()
{
_LIBCPP_ASSERT(this->has_value(), "optional operator-> called for disengaged value");
#ifndef _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF
return _VSTD::addressof(this->__get());
#else
return __operator_arrow(__has_operator_addressof<value_type>{}, this->__get());
#endif
}
_LIBCPP_INLINE_VISIBILITY
constexpr
const value_type&
operator*() const&
{
_LIBCPP_ASSERT(this->has_value(), "optional operator* called for disengaged value");
return this->__get();
}
_LIBCPP_INLINE_VISIBILITY
constexpr
value_type&
operator*() &
{
_LIBCPP_ASSERT(this->has_value(), "optional operator* called for disengaged value");
return this->__get();
}
_LIBCPP_INLINE_VISIBILITY
constexpr
value_type&&
operator*() &&
{
_LIBCPP_ASSERT(this->has_value(), "optional operator* called for disengaged value");
return _VSTD::move(this->__get());
}
_LIBCPP_INLINE_VISIBILITY
constexpr
const value_type&&
operator*() const&&
{
_LIBCPP_ASSERT(this->has_value(), "optional operator* called for disengaged value");
return _VSTD::move(this->__get());
}
_LIBCPP_INLINE_VISIBILITY
constexpr explicit operator bool() const noexcept { return has_value(); }
using __base::has_value;
using __base::__get;
_LIBCPP_INLINE_VISIBILITY
constexpr value_type const& value() const&
{
if (!this->has_value())
__throw_bad_optional_access();
return this->__get();
}
_LIBCPP_INLINE_VISIBILITY
constexpr value_type& value() &
{
if (!this->has_value())
__throw_bad_optional_access();
return this->__get();
}
_LIBCPP_INLINE_VISIBILITY
constexpr value_type&& value() &&
{
if (!this->has_value())
__throw_bad_optional_access();
return _VSTD::move(this->__get());
}
_LIBCPP_INLINE_VISIBILITY
constexpr value_type const&& value() const&&
{
if (!this->has_value())
__throw_bad_optional_access();
return _VSTD::move(this->__get());
}
template <class _Up>
_LIBCPP_INLINE_VISIBILITY
constexpr value_type value_or(_Up&& __v) const&
{
static_assert(is_copy_constructible_v<value_type>,
"optional<T>::value_or: T must be copy constructible");
static_assert(is_convertible_v<_Up, value_type>,
"optional<T>::value_or: U must be convertible to T");
return this->has_value() ? this->__get() :
static_cast<value_type>(_VSTD::forward<_Up>(__v));
}
template <class _Up>
_LIBCPP_INLINE_VISIBILITY
constexpr value_type value_or(_Up&& __v) &&
{
static_assert(is_move_constructible_v<value_type>,
"optional<T>::value_or: T must be move constructible");
static_assert(is_convertible_v<_Up, value_type>,
"optional<T>::value_or: U must be convertible to T");
return this->has_value() ? _VSTD::move(this->__get()) :
static_cast<value_type>(_VSTD::forward<_Up>(__v));
}
using __base::reset;
private:
template <class _Up>
_LIBCPP_INLINE_VISIBILITY
static _Up*
__operator_arrow(true_type, _Up& __x)
{
return _VSTD::addressof(__x);
}
template <class _Up>
_LIBCPP_INLINE_VISIBILITY
static constexpr _Up*
__operator_arrow(false_type, _Up& __x)
{
return &__x;
}
};
// Comparisons between optionals
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() ==
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator==(const optional<_Tp>& __x, const optional<_Up>& __y)
{
if (static_cast<bool>(__x) != static_cast<bool>(__y))
return false;
if (!static_cast<bool>(__x))
return true;
return *__x == *__y;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() !=
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator!=(const optional<_Tp>& __x, const optional<_Up>& __y)
{
if (static_cast<bool>(__x) != static_cast<bool>(__y))
return true;
if (!static_cast<bool>(__x))
return false;
return *__x != *__y;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator<(const optional<_Tp>& __x, const optional<_Up>& __y)
{
if (!static_cast<bool>(__y))
return false;
if (!static_cast<bool>(__x))
return true;
return *__x < *__y;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator>(const optional<_Tp>& __x, const optional<_Up>& __y)
{
if (!static_cast<bool>(__x))
return false;
if (!static_cast<bool>(__y))
return true;
return *__x > *__y;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <=
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator<=(const optional<_Tp>& __x, const optional<_Up>& __y)
{
if (!static_cast<bool>(__x))
return true;
if (!static_cast<bool>(__y))
return false;
return *__x <= *__y;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >=
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator>=(const optional<_Tp>& __x, const optional<_Up>& __y)
{
if (!static_cast<bool>(__y))
return true;
if (!static_cast<bool>(__x))
return false;
return *__x >= *__y;
}
// Comparisons with nullopt
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator==(const optional<_Tp>& __x, nullopt_t) noexcept
{
return !static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator==(nullopt_t, const optional<_Tp>& __x) noexcept
{
return !static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator!=(const optional<_Tp>& __x, nullopt_t) noexcept
{
return static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator!=(nullopt_t, const optional<_Tp>& __x) noexcept
{
return static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator<(const optional<_Tp>&, nullopt_t) noexcept
{
return false;
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator<(nullopt_t, const optional<_Tp>& __x) noexcept
{
return static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator<=(const optional<_Tp>& __x, nullopt_t) noexcept
{
return !static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator<=(nullopt_t, const optional<_Tp>&) noexcept
{
return true;
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator>(const optional<_Tp>& __x, nullopt_t) noexcept
{
return static_cast<bool>(__x);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator>(nullopt_t, const optional<_Tp>&) noexcept
{
return false;
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator>=(const optional<_Tp>&, nullopt_t) noexcept
{
return true;
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
bool
operator>=(nullopt_t, const optional<_Tp>& __x) noexcept
{
return !static_cast<bool>(__x);
}
// Comparisons with T
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() ==
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator==(const optional<_Tp>& __x, const _Up& __v)
{
return static_cast<bool>(__x) ? *__x == __v : false;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() ==
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator==(const _Tp& __v, const optional<_Up>& __x)
{
return static_cast<bool>(__x) ? __v == *__x : false;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() !=
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator!=(const optional<_Tp>& __x, const _Up& __v)
{
return static_cast<bool>(__x) ? *__x != __v : true;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() !=
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator!=(const _Tp& __v, const optional<_Up>& __x)
{
return static_cast<bool>(__x) ? __v != *__x : true;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator<(const optional<_Tp>& __x, const _Up& __v)
{
return static_cast<bool>(__x) ? *__x < __v : true;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator<(const _Tp& __v, const optional<_Up>& __x)
{
return static_cast<bool>(__x) ? __v < *__x : false;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <=
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator<=(const optional<_Tp>& __x, const _Up& __v)
{
return static_cast<bool>(__x) ? *__x <= __v : true;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() <=
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator<=(const _Tp& __v, const optional<_Up>& __x)
{
return static_cast<bool>(__x) ? __v <= *__x : false;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator>(const optional<_Tp>& __x, const _Up& __v)
{
return static_cast<bool>(__x) ? *__x > __v : false;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator>(const _Tp& __v, const optional<_Up>& __x)
{
return static_cast<bool>(__x) ? __v > *__x : true;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >=
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator>=(const optional<_Tp>& __x, const _Up& __v)
{
return static_cast<bool>(__x) ? *__x >= __v : false;
}
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY constexpr
enable_if_t<
is_convertible_v<decltype(_VSTD::declval<const _Tp&>() >=
_VSTD::declval<const _Up&>()), bool>,
bool
>
operator>=(const _Tp& __v, const optional<_Up>& __x)
{
return static_cast<bool>(__x) ? __v >= *__x : true;
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
enable_if_t<
is_move_constructible_v<_Tp> && is_swappable_v<_Tp>,
void
>
swap(optional<_Tp>& __x, optional<_Tp>& __y) noexcept(noexcept(__x.swap(__y)))
{
__x.swap(__y);
}
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY constexpr
optional<decay_t<_Tp>> make_optional(_Tp&& __v)
{
return optional<decay_t<_Tp>>(_VSTD::forward<_Tp>(__v));
}
template <class _Tp, class... _Args>
_LIBCPP_INLINE_VISIBILITY constexpr
optional<_Tp> make_optional(_Args&&... __args)
{
return optional<_Tp>(in_place, _VSTD::forward<_Args>(__args)...);
}
template <class _Tp, class _Up, class... _Args>
_LIBCPP_INLINE_VISIBILITY constexpr
optional<_Tp> make_optional(initializer_list<_Up> __il, _Args&&... __args)
{
return optional<_Tp>(in_place, __il, _VSTD::forward<_Args>(__args)...);
}
template <class _Tp>
struct _LIBCPP_TEMPLATE_VIS hash<
__enable_hash_helper<optional<_Tp>, remove_const_t<_Tp>>
>
{
typedef optional<_Tp> argument_type;
typedef size_t result_type;
_LIBCPP_INLINE_VISIBILITY
result_type operator()(const argument_type& __opt) const
{
return static_cast<bool>(__opt) ? hash<remove_const_t<_Tp>>()(*__opt) : 0;
}
};
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_STD_VER > 14
_LIBCPP_POP_MACROS
#endif // _LIBCPP_OPTIONAL
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