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duality-group / pyarrow python
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Version:
9.0.0 ▾
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// Vendored from git tag v3.2.0
// Copyright (c) 2014-2018 Martin Moene
//
// https://github.com/martinmoene/optional-lite
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#pragma once
#ifndef NONSTD_OPTIONAL_LITE_HPP
#define NONSTD_OPTIONAL_LITE_HPP
#define optional_lite_MAJOR 3
#define optional_lite_MINOR 2
#define optional_lite_PATCH 0
#define optional_lite_VERSION optional_STRINGIFY(optional_lite_MAJOR) "." optional_STRINGIFY(optional_lite_MINOR) "." optional_STRINGIFY(optional_lite_PATCH)
#define optional_STRINGIFY( x ) optional_STRINGIFY_( x )
#define optional_STRINGIFY_( x ) #x
// optional-lite configuration:
#define optional_OPTIONAL_DEFAULT 0
#define optional_OPTIONAL_NONSTD 1
#define optional_OPTIONAL_STD 2
#if !defined( optional_CONFIG_SELECT_OPTIONAL )
# define optional_CONFIG_SELECT_OPTIONAL ( optional_HAVE_STD_OPTIONAL ? optional_OPTIONAL_STD : optional_OPTIONAL_NONSTD )
#endif
// Control presence of exception handling (try and auto discover):
#ifndef optional_CONFIG_NO_EXCEPTIONS
# if defined(__cpp_exceptions) || defined(__EXCEPTIONS) || defined(_CPPUNWIND)
# define optional_CONFIG_NO_EXCEPTIONS 0
# else
# define optional_CONFIG_NO_EXCEPTIONS 1
# endif
#endif
// C++ language version detection (C++20 is speculative):
// Note: VC14.0/1900 (VS2015) lacks too much from C++14.
#ifndef optional_CPLUSPLUS
# if defined(_MSVC_LANG ) && !defined(__clang__)
# define optional_CPLUSPLUS (_MSC_VER == 1900 ? 201103L : _MSVC_LANG )
# else
# define optional_CPLUSPLUS __cplusplus
# endif
#endif
#define optional_CPP98_OR_GREATER ( optional_CPLUSPLUS >= 199711L )
#define optional_CPP11_OR_GREATER ( optional_CPLUSPLUS >= 201103L )
#define optional_CPP11_OR_GREATER_ ( optional_CPLUSPLUS >= 201103L )
#define optional_CPP14_OR_GREATER ( optional_CPLUSPLUS >= 201402L )
#define optional_CPP17_OR_GREATER ( optional_CPLUSPLUS >= 201703L )
#define optional_CPP20_OR_GREATER ( optional_CPLUSPLUS >= 202000L )
// C++ language version (represent 98 as 3):
#define optional_CPLUSPLUS_V ( optional_CPLUSPLUS / 100 - (optional_CPLUSPLUS > 200000 ? 2000 : 1994) )
// Use C++17 std::optional if available and requested:
#if optional_CPP17_OR_GREATER && defined(__has_include )
# if __has_include( <optional> )
# define optional_HAVE_STD_OPTIONAL 1
# else
# define optional_HAVE_STD_OPTIONAL 0
# endif
#else
# define optional_HAVE_STD_OPTIONAL 0
#endif
#define optional_USES_STD_OPTIONAL ( (optional_CONFIG_SELECT_OPTIONAL == optional_OPTIONAL_STD) || ((optional_CONFIG_SELECT_OPTIONAL == optional_OPTIONAL_DEFAULT) && optional_HAVE_STD_OPTIONAL) )
//
// in_place: code duplicated in any-lite, expected-lite, optional-lite, value-ptr-lite, variant-lite:
//
#ifndef nonstd_lite_HAVE_IN_PLACE_TYPES
#define nonstd_lite_HAVE_IN_PLACE_TYPES 1
// C++17 std::in_place in <utility>:
#if optional_CPP17_OR_GREATER
#include <utility>
namespace nonstd {
using std::in_place;
using std::in_place_type;
using std::in_place_index;
using std::in_place_t;
using std::in_place_type_t;
using std::in_place_index_t;
#define nonstd_lite_in_place_t( T) std::in_place_t
#define nonstd_lite_in_place_type_t( T) std::in_place_type_t<T>
#define nonstd_lite_in_place_index_t(K) std::in_place_index_t<K>
#define nonstd_lite_in_place( T) std::in_place_t{}
#define nonstd_lite_in_place_type( T) std::in_place_type_t<T>{}
#define nonstd_lite_in_place_index(K) std::in_place_index_t<K>{}
} // namespace nonstd
#else // optional_CPP17_OR_GREATER
#include <cstddef>
namespace nonstd {
namespace detail {
template< class T >
struct in_place_type_tag {};
template< std::size_t K >
struct in_place_index_tag {};
} // namespace detail
struct in_place_t {};
template< class T >
inline in_place_t in_place( detail::in_place_type_tag<T> /*unused*/ = detail::in_place_type_tag<T>() )
{
return in_place_t();
}
template< std::size_t K >
inline in_place_t in_place( detail::in_place_index_tag<K> /*unused*/ = detail::in_place_index_tag<K>() )
{
return in_place_t();
}
template< class T >
inline in_place_t in_place_type( detail::in_place_type_tag<T> /*unused*/ = detail::in_place_type_tag<T>() )
{
return in_place_t();
}
template< std::size_t K >
inline in_place_t in_place_index( detail::in_place_index_tag<K> /*unused*/ = detail::in_place_index_tag<K>() )
{
return in_place_t();
}
// mimic templated typedef:
#define nonstd_lite_in_place_t( T) nonstd::in_place_t(&)( nonstd::detail::in_place_type_tag<T> )
#define nonstd_lite_in_place_type_t( T) nonstd::in_place_t(&)( nonstd::detail::in_place_type_tag<T> )
#define nonstd_lite_in_place_index_t(K) nonstd::in_place_t(&)( nonstd::detail::in_place_index_tag<K> )
#define nonstd_lite_in_place( T) nonstd::in_place_type<T>
#define nonstd_lite_in_place_type( T) nonstd::in_place_type<T>
#define nonstd_lite_in_place_index(K) nonstd::in_place_index<K>
} // namespace nonstd
#endif // optional_CPP17_OR_GREATER
#endif // nonstd_lite_HAVE_IN_PLACE_TYPES
//
// Using std::optional:
//
#if optional_USES_STD_OPTIONAL
#include <optional>
namespace nonstd {
using std::optional;
using std::bad_optional_access;
using std::hash;
using std::nullopt;
using std::nullopt_t;
using std::operator==;
using std::operator!=;
using std::operator<;
using std::operator<=;
using std::operator>;
using std::operator>=;
using std::make_optional;
using std::swap;
}
#else // optional_USES_STD_OPTIONAL
#include <cassert>
#include <utility>
// optional-lite alignment configuration:
#ifndef optional_CONFIG_MAX_ALIGN_HACK
# define optional_CONFIG_MAX_ALIGN_HACK 0
#endif
#ifndef optional_CONFIG_ALIGN_AS
// no default, used in #if defined()
#endif
#ifndef optional_CONFIG_ALIGN_AS_FALLBACK
# define optional_CONFIG_ALIGN_AS_FALLBACK double
#endif
// Compiler warning suppression:
#if defined(__clang__)
# pragma clang diagnostic push
# pragma clang diagnostic ignored "-Wundef"
#elif defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wundef"
#elif defined(_MSC_VER )
# pragma warning( push )
#endif
// half-open range [lo..hi):
#define optional_BETWEEN( v, lo, hi ) ( (lo) <= (v) && (v) < (hi) )
// Compiler versions:
//
// MSVC++ 6.0 _MSC_VER == 1200 (Visual Studio 6.0)
// MSVC++ 7.0 _MSC_VER == 1300 (Visual Studio .NET 2002)
// MSVC++ 7.1 _MSC_VER == 1310 (Visual Studio .NET 2003)
// MSVC++ 8.0 _MSC_VER == 1400 (Visual Studio 2005)
// MSVC++ 9.0 _MSC_VER == 1500 (Visual Studio 2008)
// MSVC++ 10.0 _MSC_VER == 1600 (Visual Studio 2010)
// MSVC++ 11.0 _MSC_VER == 1700 (Visual Studio 2012)
// MSVC++ 12.0 _MSC_VER == 1800 (Visual Studio 2013)
// MSVC++ 14.0 _MSC_VER == 1900 (Visual Studio 2015)
// MSVC++ 14.1 _MSC_VER >= 1910 (Visual Studio 2017)
#if defined(_MSC_VER ) && !defined(__clang__)
# define optional_COMPILER_MSVC_VER (_MSC_VER )
# define optional_COMPILER_MSVC_VERSION (_MSC_VER / 10 - 10 * ( 5 + (_MSC_VER < 1900 ) ) )
#else
# define optional_COMPILER_MSVC_VER 0
# define optional_COMPILER_MSVC_VERSION 0
#endif
#define optional_COMPILER_VERSION( major, minor, patch ) ( 10 * (10 * (major) + (minor) ) + (patch) )
#if defined(__GNUC__) && !defined(__clang__)
# define optional_COMPILER_GNUC_VERSION optional_COMPILER_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__)
#else
# define optional_COMPILER_GNUC_VERSION 0
#endif
#if defined(__clang__)
# define optional_COMPILER_CLANG_VERSION optional_COMPILER_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__)
#else
# define optional_COMPILER_CLANG_VERSION 0
#endif
#if optional_BETWEEN(optional_COMPILER_MSVC_VERSION, 70, 140 )
# pragma warning( disable: 4345 ) // initialization behavior changed
#endif
#if optional_BETWEEN(optional_COMPILER_MSVC_VERSION, 70, 150 )
# pragma warning( disable: 4814 ) // in C++14 'constexpr' will not imply 'const'
#endif
// Presence of language and library features:
#define optional_HAVE(FEATURE) ( optional_HAVE_##FEATURE )
#ifdef _HAS_CPP0X
# define optional_HAS_CPP0X _HAS_CPP0X
#else
# define optional_HAS_CPP0X 0
#endif
// Unless defined otherwise below, consider VC14 as C++11 for optional-lite:
#if optional_COMPILER_MSVC_VER >= 1900
# undef optional_CPP11_OR_GREATER
# define optional_CPP11_OR_GREATER 1
#endif
#define optional_CPP11_90 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1500)
#define optional_CPP11_100 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1600)
#define optional_CPP11_110 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1700)
#define optional_CPP11_120 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1800)
#define optional_CPP11_140 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1900)
#define optional_CPP11_141 (optional_CPP11_OR_GREATER_ || optional_COMPILER_MSVC_VER >= 1910)
#define optional_CPP14_000 (optional_CPP14_OR_GREATER)
#define optional_CPP17_000 (optional_CPP17_OR_GREATER)
// Presence of C++11 language features:
#define optional_HAVE_CONSTEXPR_11 optional_CPP11_140
#define optional_HAVE_IS_DEFAULT optional_CPP11_140
#define optional_HAVE_NOEXCEPT optional_CPP11_140
#define optional_HAVE_NULLPTR optional_CPP11_100
#define optional_HAVE_REF_QUALIFIER optional_CPP11_140
// Presence of C++14 language features:
#define optional_HAVE_CONSTEXPR_14 optional_CPP14_000
// Presence of C++17 language features:
#define optional_HAVE_NODISCARD optional_CPP17_000
// Presence of C++ library features:
#define optional_HAVE_CONDITIONAL optional_CPP11_120
#define optional_HAVE_REMOVE_CV optional_CPP11_120
#define optional_HAVE_TYPE_TRAITS optional_CPP11_90
#define optional_HAVE_TR1_TYPE_TRAITS (!! optional_COMPILER_GNUC_VERSION )
#define optional_HAVE_TR1_ADD_POINTER (!! optional_COMPILER_GNUC_VERSION )
// C++ feature usage:
#if optional_HAVE( CONSTEXPR_11 )
# define optional_constexpr constexpr
#else
# define optional_constexpr /*constexpr*/
#endif
#if optional_HAVE( IS_DEFAULT )
# define optional_is_default = default;
#else
# define optional_is_default {}
#endif
#if optional_HAVE( CONSTEXPR_14 )
# define optional_constexpr14 constexpr
#else
# define optional_constexpr14 /*constexpr*/
#endif
#if optional_HAVE( NODISCARD )
# define optional_nodiscard [[nodiscard]]
#else
# define optional_nodiscard /*[[nodiscard]]*/
#endif
#if optional_HAVE( NOEXCEPT )
# define optional_noexcept noexcept
#else
# define optional_noexcept /*noexcept*/
#endif
#if optional_HAVE( NULLPTR )
# define optional_nullptr nullptr
#else
# define optional_nullptr NULL
#endif
#if optional_HAVE( REF_QUALIFIER )
// NOLINTNEXTLINE( bugprone-macro-parentheses )
# define optional_ref_qual &
# define optional_refref_qual &&
#else
# define optional_ref_qual /*&*/
# define optional_refref_qual /*&&*/
#endif
// additional includes:
#if optional_CONFIG_NO_EXCEPTIONS
// already included: <cassert>
#else
# include <stdexcept>
#endif
#if optional_CPP11_OR_GREATER
# include <functional>
#endif
#if optional_HAVE( INITIALIZER_LIST )
# include <initializer_list>
#endif
#if optional_HAVE( TYPE_TRAITS )
# include <type_traits>
#elif optional_HAVE( TR1_TYPE_TRAITS )
# include <tr1/type_traits>
#endif
// Method enabling
#if optional_CPP11_OR_GREATER
#define optional_REQUIRES_0(...) \
template< bool B = (__VA_ARGS__), typename std::enable_if<B, int>::type = 0 >
#define optional_REQUIRES_T(...) \
, typename = typename std::enable_if< (__VA_ARGS__), nonstd::optional_lite::detail::enabler >::type
#define optional_REQUIRES_R(R, ...) \
typename std::enable_if< (__VA_ARGS__), R>::type
#define optional_REQUIRES_A(...) \
, typename std::enable_if< (__VA_ARGS__), void*>::type = nullptr
#endif
//
// optional:
//
namespace nonstd { namespace optional_lite {
namespace std11 {
#if optional_CPP11_OR_GREATER
using std::move;
#else
template< typename T > T & move( T & t ) { return t; }
#endif
#if optional_HAVE( CONDITIONAL )
using std::conditional;
#else
template< bool B, typename T, typename F > struct conditional { typedef T type; };
template< typename T, typename F > struct conditional<false, T, F> { typedef F type; };
#endif // optional_HAVE_CONDITIONAL
} // namespace std11
#if optional_CPP11_OR_GREATER
/// type traits C++17:
namespace std17 {
#if optional_CPP17_OR_GREATER
using std::is_swappable;
using std::is_nothrow_swappable;
#elif optional_CPP11_OR_GREATER
namespace detail {
using std::swap;
struct is_swappable
{
template< typename T, typename = decltype( swap( std::declval<T&>(), std::declval<T&>() ) ) >
static std::true_type test( int /*unused*/ );
template< typename >
static std::false_type test(...);
};
struct is_nothrow_swappable
{
// wrap noexcept(expr) in separate function as work-around for VC140 (VS2015):
template< typename T >
static constexpr bool satisfies()
{
return noexcept( swap( std::declval<T&>(), std::declval<T&>() ) );
}
template< typename T >
static auto test( int /*unused*/ ) -> std::integral_constant<bool, satisfies<T>()>{}
template< typename >
static auto test(...) -> std::false_type;
};
} // namespace detail
// is [nothow] swappable:
template< typename T >
struct is_swappable : decltype( detail::is_swappable::test<T>(0) ){};
template< typename T >
struct is_nothrow_swappable : decltype( detail::is_nothrow_swappable::test<T>(0) ){};
#endif // optional_CPP17_OR_GREATER
} // namespace std17
/// type traits C++20:
namespace std20 {
template< typename T >
struct remove_cvref
{
typedef typename std::remove_cv< typename std::remove_reference<T>::type >::type type;
};
} // namespace std20
#endif // optional_CPP11_OR_GREATER
/// class optional
template< typename T >
class optional;
namespace detail {
// for optional_REQUIRES_T
#if optional_CPP11_OR_GREATER
enum class enabler{};
#endif
// C++11 emulation:
struct nulltype{};
template< typename Head, typename Tail >
struct typelist
{
typedef Head head;
typedef Tail tail;
};
#if optional_CONFIG_MAX_ALIGN_HACK
// Max align, use most restricted type for alignment:
#define optional_UNIQUE( name ) optional_UNIQUE2( name, __LINE__ )
#define optional_UNIQUE2( name, line ) optional_UNIQUE3( name, line )
#define optional_UNIQUE3( name, line ) name ## line
#define optional_ALIGN_TYPE( type ) \
type optional_UNIQUE( _t ); struct_t< type > optional_UNIQUE( _st )
template< typename T >
struct struct_t { T _; };
union max_align_t
{
optional_ALIGN_TYPE( char );
optional_ALIGN_TYPE( short int );
optional_ALIGN_TYPE( int );
optional_ALIGN_TYPE( long int );
optional_ALIGN_TYPE( float );
optional_ALIGN_TYPE( double );
optional_ALIGN_TYPE( long double );
optional_ALIGN_TYPE( char * );
optional_ALIGN_TYPE( short int * );
optional_ALIGN_TYPE( int * );
optional_ALIGN_TYPE( long int * );
optional_ALIGN_TYPE( float * );
optional_ALIGN_TYPE( double * );
optional_ALIGN_TYPE( long double * );
optional_ALIGN_TYPE( void * );
#ifdef HAVE_LONG_LONG
optional_ALIGN_TYPE( long long );
#endif
struct Unknown;
Unknown ( * optional_UNIQUE(_) )( Unknown );
Unknown * Unknown::* optional_UNIQUE(_);
Unknown ( Unknown::* optional_UNIQUE(_) )( Unknown );
struct_t< Unknown ( * )( Unknown) > optional_UNIQUE(_);
struct_t< Unknown * Unknown::* > optional_UNIQUE(_);
struct_t< Unknown ( Unknown::* )(Unknown) > optional_UNIQUE(_);
};
#undef optional_UNIQUE
#undef optional_UNIQUE2
#undef optional_UNIQUE3
#undef optional_ALIGN_TYPE
#elif defined( optional_CONFIG_ALIGN_AS ) // optional_CONFIG_MAX_ALIGN_HACK
// Use user-specified type for alignment:
#define optional_ALIGN_AS( unused ) \
optional_CONFIG_ALIGN_AS
#else // optional_CONFIG_MAX_ALIGN_HACK
// Determine POD type to use for alignment:
#define optional_ALIGN_AS( to_align ) \
typename type_of_size< alignment_types, alignment_of< to_align >::value >::type
template< typename T >
struct alignment_of;
template< typename T >
struct alignment_of_hack
{
char c;
T t;
alignment_of_hack();
};
template< size_t A, size_t S >
struct alignment_logic
{
enum { value = A < S ? A : S };
};
template< typename T >
struct alignment_of
{
enum { value = alignment_logic<
sizeof( alignment_of_hack<T> ) - sizeof(T), sizeof(T) >::value };
};
template< typename List, size_t N >
struct type_of_size
{
typedef typename std11::conditional<
N == sizeof( typename List::head ),
typename List::head,
typename type_of_size<typename List::tail, N >::type >::type type;
};
template< size_t N >
struct type_of_size< nulltype, N >
{
typedef optional_CONFIG_ALIGN_AS_FALLBACK type;
};
template< typename T>
struct struct_t { T _; };
#define optional_ALIGN_TYPE( type ) \
typelist< type , typelist< struct_t< type >
struct Unknown;
typedef
optional_ALIGN_TYPE( char ),
optional_ALIGN_TYPE( short ),
optional_ALIGN_TYPE( int ),
optional_ALIGN_TYPE( long), optional_ALIGN_TYPE(float), optional_ALIGN_TYPE(double),
optional_ALIGN_TYPE(long double),
optional_ALIGN_TYPE(char*), optional_ALIGN_TYPE(short*), optional_ALIGN_TYPE(int*),
optional_ALIGN_TYPE(long*), optional_ALIGN_TYPE(float*), optional_ALIGN_TYPE(double*),
optional_ALIGN_TYPE(long double*),
optional_ALIGN_TYPE(Unknown (*)(Unknown)), optional_ALIGN_TYPE(Unknown* Unknown::*),
optional_ALIGN_TYPE(Unknown (Unknown::*)(Unknown)),
nulltype >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> alignment_types;
#undef optional_ALIGN_TYPE
#endif // optional_CONFIG_MAX_ALIGN_HACK
/// C++03 constructed union to hold value.
template <typename T>
union storage_t {
// private:
// template< typename > friend class optional;
typedef T value_type;
storage_t() optional_is_default
explicit storage_t(value_type const& v) {
construct_value(v);
}
void construct_value(value_type const& v) { ::new (value_ptr()) value_type(v); }
#if optional_CPP11_OR_GREATER
explicit storage_t(value_type&& v) { construct_value(std::move(v)); }
void construct_value(value_type&& v) { ::new (value_ptr()) value_type(std::move(v)); }
template <class... Args>
void emplace(Args&&... args) {
::new (value_ptr()) value_type(std::forward<Args>(args)...);
}
template <class U, class... Args>
void emplace(std::initializer_list<U> il, Args&&... args) {
::new (value_ptr()) value_type(il, std::forward<Args>(args)...);
}
#endif
void destruct_value() { value_ptr()->~T(); }
optional_nodiscard value_type const* value_ptr() const { return as<value_type>(); }
value_type* value_ptr() { return as<value_type>(); }
optional_nodiscard value_type const& value() const optional_ref_qual {
return *value_ptr();
}
value_type& value() optional_ref_qual { return *value_ptr(); }
#if optional_CPP11_OR_GREATER
optional_nodiscard value_type const&& value() const optional_refref_qual {
return std::move(value());
}
value_type&& value() optional_refref_qual { return std::move(value()); }
#endif
#if optional_CPP11_OR_GREATER
using aligned_storage_t =
typename std::aligned_storage<sizeof(value_type), alignof(value_type)>::type;
aligned_storage_t data;
#elif optional_CONFIG_MAX_ALIGN_HACK
typedef struct {
unsigned char data[sizeof(value_type)];
} aligned_storage_t;
max_align_t hack;
aligned_storage_t data;
#else
typedef optional_ALIGN_AS(value_type) align_as_type;
typedef struct {
align_as_type data[1 + (sizeof(value_type) - 1) / sizeof(align_as_type)];
} aligned_storage_t;
aligned_storage_t data;
#undef optional_ALIGN_AS
#endif // optional_CONFIG_MAX_ALIGN_HACK
optional_nodiscard void* ptr() optional_noexcept { return &data; }
optional_nodiscard void const* ptr() const optional_noexcept { return &data; }
template <typename U>
optional_nodiscard U* as() {
return reinterpret_cast<U*>(ptr());
}
template <typename U>
optional_nodiscard U const* as() const {
return reinterpret_cast<U const*>(ptr());
}
};
} // namespace detail
/// disengaged state tag
struct nullopt_t {
struct init {};
explicit optional_constexpr nullopt_t(init /*unused*/) optional_noexcept {}
};
#if optional_HAVE(CONSTEXPR_11)
constexpr nullopt_t nullopt{nullopt_t::init{}};
#else
// extra parenthesis to prevent the most vexing parse:
const nullopt_t nullopt((nullopt_t::init()));
#endif
/// optional access error
#if !optional_CONFIG_NO_EXCEPTIONS
class bad_optional_access : public std::logic_error {
public:
explicit bad_optional_access() : logic_error("bad optional access") {}
};
#endif // optional_CONFIG_NO_EXCEPTIONS
/// optional
template <typename T>
class optional {
private:
template <typename>
friend class optional;
typedef void (optional::*safe_bool)() const;
public:
typedef T value_type;
// x.x.3.1, constructors
// 1a - default construct
optional_constexpr optional() optional_noexcept : has_value_(false), contained() {}
// 1b - construct explicitly empty
// NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
optional_constexpr optional(nullopt_t /*unused*/) optional_noexcept : has_value_(false),
contained() {}
// 2 - copy-construct
optional_constexpr14 optional(
optional const& other
#if optional_CPP11_OR_GREATER
optional_REQUIRES_A(true || std::is_copy_constructible<T>::value)
#endif
)
: has_value_(other.has_value()) {
if (other.has_value()) {
contained.construct_value(other.contained.value());
}
}
#if optional_CPP11_OR_GREATER
// 3 (C++11) - move-construct from optional
optional_constexpr14 optional(
optional&& other optional_REQUIRES_A(true || std::is_move_constructible<T>::value)
// NOLINTNEXTLINE( performance-noexcept-move-constructor )
) noexcept(std::is_nothrow_move_constructible<T>::value)
: has_value_(other.has_value()) {
if (other.has_value()) {
contained.construct_value(std::move(other.contained.value()));
}
}
// 4a (C++11) - explicit converting copy-construct from optional
template <typename U>
explicit optional(optional<U> const& other optional_REQUIRES_A(
std::is_constructible<T, U const&>::value &&
!std::is_constructible<T, optional<U>&>::value &&
!std::is_constructible<T, optional<U>&&>::value &&
!std::is_constructible<T, optional<U> const&>::value &&
!std::is_constructible<T, optional<U> const&&>::value &&
!std::is_convertible<optional<U>&, T>::value &&
!std::is_convertible<optional<U>&&, T>::value &&
!std::is_convertible<optional<U> const&, T>::value &&
!std::is_convertible<optional<U> const&&, T>::value &&
!std::is_convertible<U const&, T>::value /*=> explicit */
))
: has_value_(other.has_value()) {
if (other.has_value()) {
contained.construct_value(T{other.contained.value()});
}
}
#endif // optional_CPP11_OR_GREATER
// 4b (C++98 and later) - non-explicit converting copy-construct from optional
template <typename U>
// NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
optional(
optional<U> const& other
#if optional_CPP11_OR_GREATER
optional_REQUIRES_A(std::is_constructible<T, U const&>::value &&
!std::is_constructible<T, optional<U>&>::value &&
!std::is_constructible<T, optional<U>&&>::value &&
!std::is_constructible<T, optional<U> const&>::value &&
!std::is_constructible<T, optional<U> const&&>::value &&
!std::is_convertible<optional<U>&, T>::value &&
!std::is_convertible<optional<U>&&, T>::value &&
!std::is_convertible<optional<U> const&, T>::value &&
!std::is_convertible<optional<U> const&&, T>::value &&
std::is_convertible<U const&, T>::value /*=> non-explicit */
)
#endif // optional_CPP11_OR_GREATER
)
: has_value_(other.has_value()) {
if (other.has_value()) {
contained.construct_value(other.contained.value());
}
}
#if optional_CPP11_OR_GREATER
// 5a (C++11) - explicit converting move-construct from optional
template <typename U>
explicit optional(optional<U>&& other optional_REQUIRES_A(
std::is_constructible<T, U&&>::value &&
!std::is_constructible<T, optional<U>&>::value &&
!std::is_constructible<T, optional<U>&&>::value &&
!std::is_constructible<T, optional<U> const&>::value &&
!std::is_constructible<T, optional<U> const&&>::value &&
!std::is_convertible<optional<U>&, T>::value &&
!std::is_convertible<optional<U>&&, T>::value &&
!std::is_convertible<optional<U> const&, T>::value &&
!std::is_convertible<optional<U> const&&, T>::value &&
!std::is_convertible<U&&, T>::value /*=> explicit */
))
: has_value_(other.has_value()) {
if (other.has_value()) {
contained.construct_value(T{std::move(other.contained.value())});
}
}
// 5a (C++11) - non-explicit converting move-construct from optional
template <typename U>
// NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
optional(optional<U>&& other optional_REQUIRES_A(
std::is_constructible<T, U&&>::value &&
!std::is_constructible<T, optional<U>&>::value &&
!std::is_constructible<T, optional<U>&&>::value &&
!std::is_constructible<T, optional<U> const&>::value &&
!std::is_constructible<T, optional<U> const&&>::value &&
!std::is_convertible<optional<U>&, T>::value &&
!std::is_convertible<optional<U>&&, T>::value &&
!std::is_convertible<optional<U> const&, T>::value &&
!std::is_convertible<optional<U> const&&, T>::value &&
std::is_convertible<U&&, T>::value /*=> non-explicit */
))
: has_value_(other.has_value()) {
if (other.has_value()) {
contained.construct_value(std::move(other.contained.value()));
}
}
// 6 (C++11) - in-place construct
template <
typename... Args optional_REQUIRES_T(std::is_constructible<T, Args&&...>::value)>
optional_constexpr explicit optional(nonstd_lite_in_place_t(T), Args&&... args)
: has_value_(true), contained(T(std::forward<Args>(args)...)) {}
// 7 (C++11) - in-place construct, initializer-list
template <typename U,
typename... Args optional_REQUIRES_T(
std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value)>
optional_constexpr explicit optional(nonstd_lite_in_place_t(T),
std::initializer_list<U> il, Args&&... args)
: has_value_(true), contained(T(il, std::forward<Args>(args)...)) {}
// 8a (C++11) - explicit move construct from value
template <typename U = value_type>
optional_constexpr explicit optional(U&& value optional_REQUIRES_A(
std::is_constructible<T, U&&>::value &&
!std::is_same<typename std20::remove_cvref<U>::type,
nonstd_lite_in_place_t(U)>::value &&
!std::is_same<typename std20::remove_cvref<U>::type, optional<T> >::value &&
!std::is_convertible<U&&, T>::value /*=> explicit */
))
: has_value_(true), contained(T{std::forward<U>(value)}) {}
// 8b (C++11) - non-explicit move construct from value
template <typename U = value_type>
// NOLINTNEXTLINE( google-explicit-constructor, hicpp-explicit-conversions )
optional_constexpr optional(U&& value optional_REQUIRES_A(
std::is_constructible<T, U&&>::value &&
!std::is_same<typename std20::remove_cvref<U>::type,
nonstd_lite_in_place_t(U)>::value &&
!std::is_same<typename std20::remove_cvref<U>::type, optional<T> >::value &&
std::is_convertible<U&&, T>::value /*=> non-explicit */
))
: has_value_(true), contained(std::forward<U>(value)) {}
#else // optional_CPP11_OR_GREATER
// 8 (C++98)
optional(value_type const& value) : has_value_(true), contained(value) {}
#endif // optional_CPP11_OR_GREATER
// x.x.3.2, destructor
~optional() {
if (has_value()) {
contained.destruct_value();
}
}
// x.x.3.3, assignment
// 1 (C++98and later) - assign explicitly empty
optional& operator=(nullopt_t /*unused*/) optional_noexcept {
reset();
return *this;
}
// 2 (C++98and later) - copy-assign from optional
#if optional_CPP11_OR_GREATER
// NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature,
// misc-unconventional-assign-operator )
optional_REQUIRES_R(optional&, true
// std::is_copy_constructible<T>::value
// && std::is_copy_assignable<T>::value
)
operator=(optional const& other) noexcept(
std::is_nothrow_move_assignable<T>::value&&
std::is_nothrow_move_constructible<T>::value)
#else
optional& operator=(optional const& other)
#endif
{
if ((has_value() == true) && (other.has_value() == false)) {
reset();
} else if ((has_value() == false) && (other.has_value() == true)) {
initialize(*other);
} else if ((has_value() == true) && (other.has_value() == true)) {
contained.value() = *other;
}
return *this;
}
#if optional_CPP11_OR_GREATER
// 3 (C++11) - move-assign from optional
// NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature,
// misc-unconventional-assign-operator )
optional_REQUIRES_R(optional&, true
// std::is_move_constructible<T>::value
// && std::is_move_assignable<T>::value
)
operator=(optional&& other) noexcept {
if ((has_value() == true) && (other.has_value() == false)) {
reset();
} else if ((has_value() == false) && (other.has_value() == true)) {
initialize(std::move(*other));
} else if ((has_value() == true) && (other.has_value() == true)) {
contained.value() = std::move(*other);
}
return *this;
}
// 4 (C++11) - move-assign from value
template <typename U = T>
// NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature,
// misc-unconventional-assign-operator )
optional_REQUIRES_R(
optional&,
std::is_constructible<T, U>::value&& std::is_assignable<T&, U>::value &&
!std::is_same<typename std20::remove_cvref<U>::type,
nonstd_lite_in_place_t(U)>::value &&
!std::is_same<typename std20::remove_cvref<U>::type, optional<T> >::value &&
!(std::is_scalar<T>::value &&
std::is_same<T, typename std::decay<U>::type>::value))
operator=(U&& value) {
if (has_value()) {
contained.value() = std::forward<U>(value);
} else {
initialize(T(std::forward<U>(value)));
}
return *this;
}
#else // optional_CPP11_OR_GREATER
// 4 (C++98) - copy-assign from value
template <typename U /*= T*/>
optional& operator=(U const& value) {
if (has_value())
contained.value() = value;
else
initialize(T(value));
return *this;
}
#endif // optional_CPP11_OR_GREATER
// 5 (C++98 and later) - converting copy-assign from optional
template <typename U>
#if optional_CPP11_OR_GREATER
// NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature,
// misc-unconventional-assign-operator )
optional_REQUIRES_R(optional&,
std::is_constructible<T, U const&>::value&&
std::is_assignable<T&, U const&>::value &&
!std::is_constructible<T, optional<U>&>::value &&
!std::is_constructible<T, optional<U>&&>::value &&
!std::is_constructible<T, optional<U> const&>::value &&
!std::is_constructible<T, optional<U> const&&>::value &&
!std::is_convertible<optional<U>&, T>::value &&
!std::is_convertible<optional<U>&&, T>::value &&
!std::is_convertible<optional<U> const&, T>::value &&
!std::is_convertible<optional<U> const&&, T>::value &&
!std::is_assignable<T&, optional<U>&>::value &&
!std::is_assignable<T&, optional<U>&&>::value &&
!std::is_assignable<T&, optional<U> const&>::value &&
!std::is_assignable<T&, optional<U> const&&>::value)
#else
optional&
#endif // optional_CPP11_OR_GREATER
operator=(optional<U> const& other) {
return *this = optional(other);
}
#if optional_CPP11_OR_GREATER
// 6 (C++11) - converting move-assign from optional
template <typename U>
// NOLINTNEXTLINE( cppcoreguidelines-c-copy-assignment-signature,
// misc-unconventional-assign-operator )
optional_REQUIRES_R(
optional&, std::is_constructible<T, U>::value&& std::is_assignable<T&, U>::value &&
!std::is_constructible<T, optional<U>&>::value &&
!std::is_constructible<T, optional<U>&&>::value &&
!std::is_constructible<T, optional<U> const&>::value &&
!std::is_constructible<T, optional<U> const&&>::value &&
!std::is_convertible<optional<U>&, T>::value &&
!std::is_convertible<optional<U>&&, T>::value &&
!std::is_convertible<optional<U> const&, T>::value &&
!std::is_convertible<optional<U> const&&, T>::value &&
!std::is_assignable<T&, optional<U>&>::value &&
!std::is_assignable<T&, optional<U>&&>::value &&
!std::is_assignable<T&, optional<U> const&>::value &&
!std::is_assignable<T&, optional<U> const&&>::value)
operator=(optional<U>&& other) {
return *this = optional(std::move(other));
}
// 7 (C++11) - emplace
template <
typename... Args optional_REQUIRES_T(std::is_constructible<T, Args&&...>::value)>
T& emplace(Args&&... args) {
*this = nullopt;
contained.emplace(std::forward<Args>(args)...);
has_value_ = true;
return contained.value();
}
// 8 (C++11) - emplace, initializer-list
template <typename U,
typename... Args optional_REQUIRES_T(
std::is_constructible<T, std::initializer_list<U>&, Args&&...>::value)>
T& emplace(std::initializer_list<U> il, Args&&... args) {
*this = nullopt;
contained.emplace(il, std::forward<Args>(args)...);
has_value_ = true;
return contained.value();
}
#endif // optional_CPP11_OR_GREATER
// x.x.3.4, swap
void swap(optional& other)
#if optional_CPP11_OR_GREATER
noexcept(std::is_nothrow_move_constructible<T>::value&&
std17::is_nothrow_swappable<T>::value)
#endif
{
using std::swap;
if ((has_value() == true) && (other.has_value() == true)) {
swap(**this, *other);
} else if ((has_value() == false) && (other.has_value() == true)) {
initialize(std11::move(*other));
other.reset();
} else if ((has_value() == true) && (other.has_value() == false)) {
other.initialize(std11::move(**this));
reset();
}
}
// x.x.3.5, observers
optional_constexpr value_type const* operator->() const {
return assert(has_value()), contained.value_ptr();
}
optional_constexpr14 value_type* operator->() {
return assert(has_value()), contained.value_ptr();
}
optional_constexpr value_type const& operator*() const optional_ref_qual {
return assert(has_value()), contained.value();
}
optional_constexpr14 value_type& operator*() optional_ref_qual {
return assert(has_value()), contained.value();
}
#if optional_HAVE(REF_QUALIFIER) && \
(!optional_COMPILER_GNUC_VERSION || optional_COMPILER_GNUC_VERSION >= 490)
optional_constexpr value_type const&& operator*() const optional_refref_qual {
return std::move(**this);
}
optional_constexpr14 value_type&& operator*() optional_refref_qual {
return std::move(**this);
}
#endif
#if optional_CPP11_OR_GREATER
optional_constexpr explicit operator bool() const optional_noexcept {
return has_value();
}
#else
optional_constexpr operator safe_bool() const optional_noexcept {
return has_value() ? &optional::this_type_does_not_support_comparisons : 0;
}
#endif
// NOLINTNEXTLINE( modernize-use-nodiscard )
/*optional_nodiscard*/ optional_constexpr bool has_value() const optional_noexcept {
return has_value_;
}
// NOLINTNEXTLINE( modernize-use-nodiscard )
/*optional_nodiscard*/ optional_constexpr14 value_type const& value() const
optional_ref_qual {
#if optional_CONFIG_NO_EXCEPTIONS
assert(has_value());
#else
if (!has_value()) {
throw bad_optional_access();
}
#endif
return contained.value();
}
optional_constexpr14 value_type& value() optional_ref_qual {
#if optional_CONFIG_NO_EXCEPTIONS
assert(has_value());
#else
if (!has_value()) {
throw bad_optional_access();
}
#endif
return contained.value();
}
#if optional_HAVE(REF_QUALIFIER) && \
(!optional_COMPILER_GNUC_VERSION || optional_COMPILER_GNUC_VERSION >= 490)
// NOLINTNEXTLINE( modernize-use-nodiscard )
/*optional_nodiscard*/ optional_constexpr value_type const&& value() const
optional_refref_qual {
return std::move(value());
}
optional_constexpr14 value_type&& value() optional_refref_qual {
return std::move(value());
}
#endif
#if optional_CPP11_OR_GREATER
template <typename U>
optional_constexpr value_type value_or(U&& v) const optional_ref_qual {
return has_value() ? contained.value() : static_cast<T>(std::forward<U>(v));
}
template <typename U>
optional_constexpr14 value_type value_or(U&& v) optional_refref_qual {
return has_value() ? std::move(contained.value())
: static_cast<T>(std::forward<U>(v));
}
#else
template <typename U>
optional_constexpr value_type value_or(U const& v) const {
return has_value() ? contained.value() : static_cast<value_type>(v);
}
#endif // optional_CPP11_OR_GREATER
// x.x.3.6, modifiers
void reset() optional_noexcept {
if (has_value()) {
contained.destruct_value();
}
has_value_ = false;
}
private:
void this_type_does_not_support_comparisons() const {}
template <typename V>
void initialize(V const& value) {
assert(!has_value());
contained.construct_value(value);
has_value_ = true;
}
#if optional_CPP11_OR_GREATER
template <typename V>
void initialize(V&& value) {
assert(!has_value());
contained.construct_value(std::move(value));
has_value_ = true;
}
#endif
private:
bool has_value_;
detail::storage_t<value_type> contained;
};
// Relational operators
template <typename T, typename U>
inline optional_constexpr bool operator==(optional<T> const& x, optional<U> const& y) {
return bool(x) != bool(y) ? false : !bool(x) ? true : *x == *y;
}
template <typename T, typename U>
inline optional_constexpr bool operator!=(optional<T> const& x, optional<U> const& y) {
return !(x == y);
}
template <typename T, typename U>
inline optional_constexpr bool operator<(optional<T> const& x, optional<U> const& y) {
return (!y) ? false : (!x) ? true : *x < *y;
}
template <typename T, typename U>
inline optional_constexpr bool operator>(optional<T> const& x, optional<U> const& y) {
return (y < x);
}
template <typename T, typename U>
inline optional_constexpr bool operator<=(optional<T> const& x, optional<U> const& y) {
return !(y < x);
}
template <typename T, typename U>
inline optional_constexpr bool operator>=(optional<T> const& x, optional<U> const& y) {
return !(x < y);
}
// Comparison with nullopt
template <typename T>
inline optional_constexpr bool operator==(optional<T> const& x,
nullopt_t /*unused*/) optional_noexcept {
return (!x);
}
template <typename T>
inline optional_constexpr bool operator==(nullopt_t /*unused*/,
optional<T> const& x) optional_noexcept {
return (!x);
}
template <typename T>
inline optional_constexpr bool operator!=(optional<T> const& x,
nullopt_t /*unused*/) optional_noexcept {
return bool(x);
}
template <typename T>
inline optional_constexpr bool operator!=(nullopt_t /*unused*/,
optional<T> const& x) optional_noexcept {
return bool(x);
}
template <typename T>
inline optional_constexpr bool operator<(optional<T> const& /*unused*/,
nullopt_t /*unused*/) optional_noexcept {
return false;
}
template <typename T>
inline optional_constexpr bool operator<(nullopt_t /*unused*/,
optional<T> const& x) optional_noexcept {
return bool(x);
}
template <typename T>
inline optional_constexpr bool operator<=(optional<T> const& x,
nullopt_t /*unused*/) optional_noexcept {
return (!x);
}
template <typename T>
inline optional_constexpr bool operator<=(
nullopt_t /*unused*/, optional<T> const& /*unused*/) optional_noexcept {
return true;
}
template <typename T>
inline optional_constexpr bool operator>(optional<T> const& x,
nullopt_t /*unused*/) optional_noexcept {
return bool(x);
}
template <typename T>
inline optional_constexpr bool operator>(
nullopt_t /*unused*/, optional<T> const& /*unused*/) optional_noexcept {
return false;
}
template <typename T>
inline optional_constexpr bool operator>=(optional<T> const& /*unused*/,
nullopt_t /*unused*/) optional_noexcept {
return true;
}
template <typename T>
inline optional_constexpr bool operator>=(nullopt_t /*unused*/,
optional<T> const& x) optional_noexcept {
return (!x);
}
// Comparison with T
template <typename T, typename U>
inline optional_constexpr bool operator==(optional<T> const& x, U const& v) {
return bool(x) ? *x == v : false;
}
template <typename T, typename U>
inline optional_constexpr bool operator==(U const& v, optional<T> const& x) {
return bool(x) ? v == *x : false;
}
template <typename T, typename U>
inline optional_constexpr bool operator!=(optional<T> const& x, U const& v) {
return bool(x) ? *x != v : true;
}
template <typename T, typename U>
inline optional_constexpr bool operator!=(U const& v, optional<T> const& x) {
return bool(x) ? v != *x : true;
}
template <typename T, typename U>
inline optional_constexpr bool operator<(optional<T> const& x, U const& v) {
return bool(x) ? *x < v : true;
}
template <typename T, typename U>
inline optional_constexpr bool operator<(U const& v, optional<T> const& x) {
return bool(x) ? v < *x : false;
}
template <typename T, typename U>
inline optional_constexpr bool operator<=(optional<T> const& x, U const& v) {
return bool(x) ? *x <= v : true;
}
template <typename T, typename U>
inline optional_constexpr bool operator<=(U const& v, optional<T> const& x) {
return bool(x) ? v <= *x : false;
}
template <typename T, typename U>
inline optional_constexpr bool operator>(optional<T> const& x, U const& v) {
return bool(x) ? *x > v : false;
}
template <typename T, typename U>
inline optional_constexpr bool operator>(U const& v, optional<T> const& x) {
return bool(x) ? v > *x : true;
}
template <typename T, typename U>
inline optional_constexpr bool operator>=(optional<T> const& x, U const& v) {
return bool(x) ? *x >= v : false;
}
template <typename T, typename U>
inline optional_constexpr bool operator>=(U const& v, optional<T> const& x) {
return bool(x) ? v >= *x : true;
}
// Specialized algorithms
template <typename T
#if optional_CPP11_OR_GREATER
optional_REQUIRES_T(
std::is_move_constructible<T>::value&& std17::is_swappable<T>::value)
#endif
>
void swap(optional<T>& x, optional<T>& y)
#if optional_CPP11_OR_GREATER
noexcept(noexcept(x.swap(y)))
#endif
{
x.swap(y);
}
#if optional_CPP11_OR_GREATER
template <typename T>
optional_constexpr optional<typename std::decay<T>::type> make_optional(T&& value) {
return optional<typename std::decay<T>::type>(std::forward<T>(value));
}
template <typename T, typename... Args>
optional_constexpr optional<T> make_optional(Args&&... args) {
return optional<T>(nonstd_lite_in_place(T), std::forward<Args>(args)...);
}
template <typename T, typename U, typename... Args>
optional_constexpr optional<T> make_optional(std::initializer_list<U> il,
Args&&... args) {
return optional<T>(nonstd_lite_in_place(T), il, std::forward<Args>(args)...);
}
#else
template <typename T>
optional<T> make_optional(T const& value) {
return optional<T>(value);
}
#endif // optional_CPP11_OR_GREATER
} // namespace optional_lite
using optional_lite::bad_optional_access;
using optional_lite::nullopt;
using optional_lite::nullopt_t;
using optional_lite::optional;
using optional_lite::make_optional;
} // namespace nonstd
#if optional_CPP11_OR_GREATER
// specialize the std::hash algorithm:
namespace std {
template <class T>
struct hash<nonstd::optional<T> > {
public:
std::size_t operator()(nonstd::optional<T> const& v) const optional_noexcept {
return bool(v) ? std::hash<T>{}(*v) : 0;
}
};
} // namespace std
#endif // optional_CPP11_OR_GREATER
#if defined(__clang__)
#pragma clang diagnostic pop
#elif defined(__GNUC__)
#pragma GCC diagnostic pop
#elif defined(_MSC_VER)
#pragma warning(pop)
#endif
#endif // optional_USES_STD_OPTIONAL
#endif // NONSTD_OPTIONAL_LITE_HPP