FM / util

/usr/local/lib64/python3.6/site-packages/pyarrow/include/arrow/util/

/usr/local/lib64/python3.6/site-packages/pyarrow/include/arrow/util

Name	Size	Mode	Actions
algorithm.h	1229	0644	edit dl rm
aligned_storage.h	4302	0644	edit dl rm
align_util.h	2636	0644	edit dl rm
async_generator.h	64088	0644	edit dl rm
async_util.h	9633	0644	edit dl rm
atomic_shared_ptr.h	3640	0644	edit dl rm
base64.h	1098	0644	edit dl rm
basic_decimal.h	20334	0644	edit dl rm
benchmark_util.h	4584	0644	edit dl rm
bitmap.h	17463	0644	edit dl rm
bitmap_builders.h	1563	0644	edit dl rm
bitmap_generate.h	3563	0644	edit dl rm
bitmap_ops.h	9084	0644	edit dl rm
bitmap_reader.h	8347	0644	edit dl rm
bitmap_visit.h	3460	0644	edit dl rm
bitmap_writer.h	9360	0644	edit dl rm
bitset_stack.h	2789	0644	edit dl rm
bit_block_counter.h	19141	0644	edit dl rm
bit_run_reader.h	16599	0644	edit dl rm
bit_stream_utils.h	16986	0644	edit dl rm
bit_util.h	11568	0644	edit dl rm
bpacking.h	1175	0644	edit dl rm
bpacking64_default.h	195934	0644	edit dl rm
bpacking_avx2.h	1009	0644	edit dl rm
bpacking_avx512.h	1011	0644	edit dl rm
bpacking_default.h	103232	0644	edit dl rm
bpacking_neon.h	1009	0644	edit dl rm
bpacking_simd128_generated.h	98529	0644	edit dl rm
bpacking_simd256_generated.h	77475	0644	edit dl rm
bpacking_simd512_generated.h	67081	0644	edit dl rm
byte_stream_split.h	28784	0644	edit dl rm
cancel.h	2911	0644	edit dl rm
checked_cast.h	2076	0644	edit dl rm
compare.h	1981	0644	edit dl rm
compression.h	7367	0644	edit dl rm
concurrent_map.h	1775	0644	edit dl rm
config.h	1659	0644	edit dl rm
converter.h	14657	0644	edit dl rm
counting_semaphore.h	2251	0644	edit dl rm
cpu_info.h	4724	0644	edit dl rm
decimal.h	11687	0644	edit dl rm
delimiting.h	7335	0644	edit dl rm
dispatch.h	3235	0644	edit dl rm
double_conversion.h	1195	0644	edit dl rm
endian.h	8071	0644	edit dl rm
formatting.h	20612	0644	edit dl rm
functional.h	5612	0644	edit dl rm
future.h	36168	0644	edit dl rm
future_iterator.h	2517	0644	edit dl rm
hashing.h	30633	0644	edit dl rm
hash_util.h	1914	0644	edit dl rm
int_util.h	4284	0644	edit dl rm
io_util.h	10326	0644	edit dl rm
iterator.h	18123	0644	edit dl rm
key_value_metadata.h	3579	0644	edit dl rm
launder.h	1051	0644	edit dl rm
logging.h	9338	0644	edit dl rm
macros.h	7349	0644	edit dl rm
make_unique.h	1475	0644	edit dl rm
map.h	2476	0644	edit dl rm
math_constants.h	1106	0644	edit dl rm
memory.h	1566	0644	edit dl rm
mutex.h	1833	0644	edit dl rm
optional.h	1174	0644	edit dl rm
parallel.h	3616	0644	edit dl rm
pcg_random.h	1146	0644	edit dl rm
print.h	1725	0644	edit dl rm
queue.h	1017	0644	edit dl rm
range.h	4834	0644	edit dl rm
rle_encoding.h	31029	0644	edit dl rm
simd.h	1333	0644	edit dl rm
small_vector.h	14660	0644	edit dl rm
sort.h	2466	0644	edit dl rm
spaced.h	3567	0644	edit dl rm
stopwatch.h	1401	0644	edit dl rm
string.h	2570	0644	edit dl rm
string_builder.h	2446	0644	edit dl rm
string_view.h	1269	0644	edit dl rm
task_group.h	4362	0644	edit dl rm
tdigest.h	3052	0644	edit dl rm
test_common.h	2837	0644	edit dl rm
thread_pool.h	15338	0644	edit dl rm
time.h	2988	0644	edit dl rm
trie.h	7157	0644	edit dl rm
type_fwd.h	1409	0644	edit dl rm
type_traits.h	2894	0644	edit dl rm
ubsan.h	2777	0644	edit dl rm
unreachable.h	926	0644	edit dl rm
uri.h	3297	0644	edit dl rm
utf8.h	18780	0644	edit dl rm
value_parsing.h	27056	0644	edit dl rm
variant.h	13728	0644	edit dl rm
vector.h	5665	0644	edit dl rm
visibility.h	1463	0644	edit dl rm
windows_compatibility.h	1260	0644	edit dl rm
windows_fixup.h	1379	0644	edit dl rm

Edit: /usr/local/lib64/python3.6/site-packages/pyarrow/include/arrow/util/variant.h (13728B)

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#pragma once

#include <cstddef>
#include <exception>
#include <type_traits>
#include <utility>

#include "arrow/util/macros.h"
#include "arrow/util/type_traits.h"

namespace arrow {
namespace util {

/// \brief a std::variant-like discriminated union
///
/// Simplifications from std::variant:
///
/// - Strictly defaultable. The first type of T... should be nothrow default constructible
/// and it will be used for default Variants.
///
/// - Never valueless_by_exception. std::variant supports a state outside those specified
/// by T... to which it can return in the event that a constructor throws. If a Variant
/// would become valueless_by_exception it will instead return to its default state.
///
/// - Strictly nothrow move constructible and assignable
///
/// - Less sophisticated type deduction. std::variant<bool, std::string>("hello") will
/// intelligently construct std::string while Variant<bool, std::string>("hello") will
/// construct bool.
///
/// - Either both copy constructible and assignable or neither (std::variant independently
/// enables copy construction and copy assignment). Variant is copy constructible if
/// each of T... is copy constructible and assignable.
///
/// - Slimmer interface; several members of std::variant are omitted.
///
/// - Throws no exceptions; if a bad_variant_access would be thrown Variant will instead
/// segfault (nullptr dereference).
///
/// - Mutable visit takes a pointer instead of mutable reference or rvalue reference,
/// which is more conformant with our code style.
template <typename... T>
class Variant;

namespace detail {

template <typename T, typename = void>
struct is_equality_comparable : std::false_type {};

template <typename T>
struct is_equality_comparable<
 T, typename std::enable_if<std::is_convertible<
 decltype(std::declval<T>() == std::declval<T>()), bool>::value>::type>
 : std::true_type {};

template <bool C, typename T, typename E>
using conditional_t = typename std::conditional<C, T, E>::type;

template <typename T>
struct type_constant {
 using type = T;
};

template <typename...>
struct first;

template <typename H, typename... T>
struct first<H, T...> {
 using type = H;
};

template <typename T>
using decay_t = typename std::decay<T>::type;

template <bool...>
struct all : std::true_type {};

template <bool H, bool... T>
struct all<H, T...> : conditional_t<H, all<T...>, std::false_type> {};

struct delete_copy_constructor {
 template <typename>
 struct type {
 type() = default;
 type(const type& other) = delete;
 type& operator=(const type& other) = delete;
 };
};

struct explicit_copy_constructor {
 template <typename Copyable>
 struct type {
 type() = default;
 type(const type& other) { static_cast<const Copyable&>(other).copy_to(this); }
 type& operator=(const type& other) {
 static_cast<Copyable*>(this)->destroy();
 static_cast<const Copyable&>(other).copy_to(this);
 return *this;
 }
 };
};

template <typename... T>
struct VariantStorage {
 VariantStorage() = default;
 VariantStorage(const VariantStorage&) {}
 VariantStorage& operator=(const VariantStorage&) { return *this; }
 VariantStorage(VariantStorage&&) noexcept {}
 VariantStorage& operator=(VariantStorage&&) noexcept { return *this; }
 ~VariantStorage() {
 static_assert(offsetof(VariantStorage, data_) == 0,
 "(void*)&VariantStorage::data_ == (void*)this");
 }

typename arrow::internal::aligned_union<0, T...>::type data_;
 uint8_t index_ = 0;
};

template <typename V, typename...>
struct VariantImpl;

template <typename... T>
struct VariantImpl<Variant<T...>> : VariantStorage<T...> {
 static void index_of() noexcept {}
 void destroy() noexcept {}
 void move_to(...) noexcept {}
 void copy_to(...) const {}

template <typename R, typename Visitor>
 [[noreturn]] R visit_const(Visitor&& visitor) const {
 std::terminate();
 }
 template <typename R, typename Visitor>
 [[noreturn]] R visit_mutable(Visitor&& visitor) {
 std::terminate();
 }
};

template <typename... M, typename H, typename... T>
struct VariantImpl<Variant<M...>, H, T...> : VariantImpl<Variant<M...>, T...> {
 using VariantType = Variant<M...>;
 using Impl = VariantImpl<VariantType, T...>;

static constexpr uint8_t kIndex = sizeof...(M) - sizeof...(T) - 1;

VariantImpl() = default;

using VariantImpl<VariantType, T...>::VariantImpl;
 using Impl::operator=;
 using Impl::index_of;

explicit VariantImpl(H value) {
    new (this) H(std::move(value));
    this->index_ = kIndex;
  }

VariantImpl& operator=(H value) {
 static_cast<VariantType*>(this)->destroy();
 new (this) H(std::move(value));
 this->index_ = kIndex;
 return *this;
 }

H& cast_this() { return *reinterpret_cast<H*>(this); }
 const H& cast_this() const { return *reinterpret_cast<const H*>(this); }

void move_to(VariantType* target) noexcept {
    if (this->index_ == kIndex) {
      new (target) H(std::move(cast_this()));
      target->index_ = kIndex;
    } else {
      Impl::move_to(target);
    }
  }

// Templated to avoid instantiation in case H is not copy constructible
 template <typename Void>
 void copy_to(Void* generic_target) const {
 const auto target = static_cast<VariantType*>(generic_target);
 try {
 if (this->index_ == kIndex) {
 new (target) H(cast_this());
 target->index_ = kIndex;
 } else {
 Impl::copy_to(target);
 }
 } catch (...) {
 target->construct_default();
 throw;
 }
 }

void destroy() noexcept {
 if (this->index_ == kIndex) {
 if (!std::is_trivially_destructible<H>::value) {
 cast_this().~H();
 }
 } else {
 Impl::destroy();
 }
 }

static constexpr std::integral_constant<uint8_t, kIndex> index_of(
 const type_constant<H>&) {
 return {};
 }

template <typename R, typename Visitor>
 R visit_const(Visitor&& visitor) const {
 if (this->index_ == kIndex) {
 return std::forward<Visitor>(visitor)(cast_this());
 }
 return Impl::template visit_const<R>(std::forward<Visitor>(visitor));
 }

template <typename R, typename Visitor>
 R visit_mutable(Visitor&& visitor) {
 if (this->index_ == kIndex) {
 return std::forward<Visitor>(visitor)(&cast_this());
 }
 return Impl::template visit_mutable<R>(std::forward<Visitor>(visitor));
 }
};

}  // namespace detail

template <typename... T>
class Variant : detail::VariantImpl<Variant<T...>, T...>,
 detail::conditional_t<
 detail::all<(std::is_copy_constructible<T>::value &&
 std::is_copy_assignable<T>::value)...>::value,
 detail::explicit_copy_constructor,
 detail::delete_copy_constructor>::template type<Variant<T...>> {
 template <typename U>
 static constexpr uint8_t index_of() {
 return Impl::index_of(detail::type_constant{});
 }

using Impl = detail::VariantImpl<Variant<T...>, T...>;

public:
 using default_type = typename util::detail::first<T...>::type;

Variant() noexcept { construct_default(); }

Variant(const Variant& other) = default;
  Variant& operator=(const Variant& other) = default;
  Variant& operator=(Variant&& other) noexcept {
    this->destroy();
    other.move_to(this);
    return *this;
  }

using Impl::Impl;
  using Impl::operator=;

Variant(Variant&& other) noexcept { other.move_to(this); }

~Variant() {
    static_assert(offsetof(Variant, data_) == 0, "(void*)&Variant::data_ == (void*)this");
    this->destroy();
  }

/// \brief Return the zero-based type index of the value held by the variant
  uint8_t index() const noexcept { return this->index_; }

/// \brief Get a const pointer to the value held by the variant
 ///
 /// If the type given as template argument doesn't match, a null pointer is returned.
 template <typename U, uint8_t I = index_of()>
 const U* get() const noexcept {
 return index() == I ? reinterpret_cast<const U*>(this) : NULLPTR;
 }

/// \brief Get a pointer to the value held by the variant
 ///
 /// If the type given as template argument doesn't match, a null pointer is returned.
 template <typename U, uint8_t I = index_of()>
 U* get() noexcept {
 return index() == I ? reinterpret_cast<U*>(this) : NULLPTR;
 }

/// \brief Replace the value held by the variant
 ///
 /// The intended type must be given as a template argument.
 /// The value is constructed in-place using the given function arguments.
 template <typename U, typename... A, uint8_t I = index_of()>
 void emplace(A&&... args) {
 try {
 this->destroy();
 new (this) U(std::forward<A>(args)...);
 this->index_ = I;
 } catch (...) {
 construct_default();
 throw;
 }
 }

template <typename U, typename E, typename... A, uint8_t I = index_of()>
 void emplace(std::initializer_list<E> il, A&&... args) {
 try {
 this->destroy();
 new (this) U(il, std::forward<A>(args)...);
 this->index_ = I;
 } catch (...) {
 construct_default();
 throw;
 }
 }

/// \brief Swap with another variant's contents
  void swap(Variant& other) noexcept {  // NOLINT google-runtime-references
    Variant tmp = std::move(other);
    other = std::move(*this);
    *this = std::move(tmp);
  }

using Impl::visit_const;
  using Impl::visit_mutable;

private:
  void construct_default() noexcept {
    new (this) default_type();
    this->index_ = 0;
  }

template <typename V>
 friend struct detail::explicit_copy_constructor::type;

template <typename V, typename...>
 friend struct detail::VariantImpl;
};

/// \brief Call polymorphic visitor on a const variant's value
///
/// The visitor will receive a const reference to the value held by the variant.
/// It must define overloads for each possible variant type.
/// The overloads should all return the same type (no attempt
/// is made to find a generalized return type).
template <typename Visitor, typename... T,
 typename R = decltype(std::declval<Visitor&&>()(
 std::declval<const typename Variant<T...>::default_type&>()))>
R visit(Visitor&& visitor, const util::Variant<T...>& v) {
 return v.template visit_const<R>(std::forward<Visitor>(visitor));
}

/// \brief Call polymorphic visitor on a non-const variant's value
///
/// The visitor will receive a pointer to the value held by the variant.
/// It must define overloads for each possible variant type.
/// The overloads should all return the same type (no attempt
/// is made to find a generalized return type).
template <typename Visitor, typename... T,
 typename R = decltype(std::declval<Visitor&&>()(
 std::declval<typename Variant<T...>::default_type*>()))>
R visit(Visitor&& visitor, util::Variant<T...>* v) {
 return v->template visit_mutable<R>(std::forward<Visitor>(visitor));
}

/// \brief Get a const reference to the value held by the variant
///
/// If the type given as template argument doesn't match, behavior is undefined
/// (a null pointer will be dereferenced).
template <typename U, typename... T>
const U& get(const Variant<T...>& v) {
 return *v.template get();
}

/// \brief Get a reference to the value held by the variant
///
/// If the type given as template argument doesn't match, behavior is undefined
/// (a null pointer will be dereferenced).
template <typename U, typename... T>
U& get(Variant<T...>& v) {
 return *v.template get();
}

/// \brief Get a const pointer to the value held by the variant
///
/// If the type given as template argument doesn't match, a nullptr is returned.
template <typename U, typename... T>
const U* get_if(const Variant<T...>* v) {
 return v->template get();
}

/// \brief Get a pointer to the value held by the variant
///
/// If the type given as template argument doesn't match, a nullptr is returned.
template <typename U, typename... T>
U* get_if(Variant<T...>* v) {
 return v->template get();
}

namespace detail {

template <typename... T>
struct VariantsEqual {
 template <typename U>
 bool operator()(const U& r) const {
 return get(l_) == r;
 }
 const Variant<T...>& l_;
};

}  // namespace detail

template <typename... T, typename = typename std::enable_if<detail::all<
 detail::is_equality_comparable<T>::value...>::value>>
bool operator==(const Variant<T...>& l, const Variant<T...>& r) {
 if (l.index() != r.index()) return false;
 return visit(detail::VariantsEqual<T...>{l}, r);
}

template <typename... T>
auto operator!=(const Variant<T...>& l, const Variant<T...>& r) -> decltype(l == r) {
 return !(l == r);
}

/// \brief Return whether the variant holds a value of the given type
template <typename U, typename... T>
bool holds_alternative(const Variant<T...>& v) {
 return v.template get();
}

}  // namespace util
}  // namespace arrow

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