FM / util

/usr/local/lib64/python3.6/site-packages/torch/include/c10/util/

/usr/local/lib64/python3.6/site-packages/torch/include/c10/util

Name	Size	Mode	Actions
accumulate.h	4205	0644	edit dl rm
AlignOf.h	4835	0644	edit dl rm
Array.h	11354	0644	edit dl rm
ArrayRef.h	9058	0644	edit dl rm
Backtrace.h	364	0644	edit dl rm
BFloat16-inl.h	9222	0644	edit dl rm
BFloat16-math.h	5217	0644	edit dl rm
BFloat16.h	2372	0644	edit dl rm
Bitset.h	3414	0644	edit dl rm
C++17.h	13329	0644	edit dl rm
complex.h	17542	0644	edit dl rm
complex_math.h	10902	0644	edit dl rm
complex_utils.h	958	0644	edit dl rm
ConstexprCrc.h	6633	0644	edit dl rm
copysign.h	866	0644	edit dl rm
DeadlockDetection.h	1920	0644	edit dl rm
Deprecated.h	3579	0644	edit dl rm
either.h	6423	0644	edit dl rm
env.h	835	0644	edit dl rm
Exception.h	24723	0644	edit dl rm
ExclusivelyOwned.h	4759	0644	edit dl rm
Flags.h	10056	0644	edit dl rm
flat_hash_map.h	61655	0644	edit dl rm
FunctionRef.h	2301	0644	edit dl rm
Half-inl.h	8674	0644	edit dl rm
Half.h	18965	0644	edit dl rm
hash.h	5084	0644	edit dl rm
IdWrapper.h	2348	0644	edit dl rm
intrusive_ptr.h	35563	0644	edit dl rm
in_place.h	350	0644	edit dl rm
irange.h	2679	0644	edit dl rm
LeftRight.h	6016	0644	edit dl rm
llvmMathExtras.h	29168	0644	edit dl rm
Logging.h	11256	0644	edit dl rm
logging_is_google_glog.h	2031	0644	edit dl rm
logging_is_not_google_glog.h	8271	0644	edit dl rm
MathConstants.h	858	0644	edit dl rm
math_compat.h	7296	0644	edit dl rm
MaybeOwned.h	6689	0644	edit dl rm
Metaprogramming.h	15288	0644	edit dl rm
numa.h	696	0644	edit dl rm
Optional.h	35592	0644	edit dl rm
order_preserving_flat_hash_map.h	65482	0644	edit dl rm
overloaded.h	709	0644	edit dl rm
python_stub.h	56	0644	edit dl rm
qint8.h	472	0644	edit dl rm
qint32.h	319	0644	edit dl rm
quint4x2.h	366	0644	edit dl rm
quint8.h	320	0644	edit dl rm
Registry.h	12242	0644	edit dl rm
reverse_iterator.h	8796	0644	edit dl rm
ScopeExit.h	1345	0644	edit dl rm
signal_handler.h	3154	0644	edit dl rm
SmallBuffer.h	1243	0644	edit dl rm
SmallVector.h	34456	0644	edit dl rm
sparse_bitset.h	26511	0644	edit dl rm
StringUtil.h	4538	0644	edit dl rm
string_utils.h	3989	0644	edit dl rm
string_view.h	20189	0644	edit dl rm
tempfile.h	6029	0644	edit dl rm
ThreadLocal.h	3883	0644	edit dl rm
ThreadLocalDebugInfo.h	2603	0644	edit dl rm
thread_name.h	148	0644	edit dl rm
Type.h	607	0644	edit dl rm
TypeCast.h	6972	0644	edit dl rm
typeid.h	18793	0644	edit dl rm
TypeIndex.h	5251	0644	edit dl rm
TypeList.h	16901	0644	edit dl rm
TypeTraits.h	5368	0644	edit dl rm
Unicode.h	295	0644	edit dl rm
UniqueVoidPtr.h	4117	0644	edit dl rm
Unroll.h	667	0644	edit dl rm
variant.h	95182	0644	edit dl rm
win32-headers.h	858	0644	edit dl rm

Edit: /usr/local/lib64/python3.6/site-packages/torch/include/c10/util/MaybeOwned.h (6689B)

#pragma once

#include <c10/macros/Macros.h>
#include <c10/util/Exception.h>
#include <c10/util/in_place.h>

#include <type_traits>

namespace c10 {

/// Traits class describing how to borrow from T.  As a synopsis, here
/// is how we might implement borrowing from an arbitrary type T using
/// a raw pointer to const:
///
/// template <typename T>
/// struct MaybeOwnedTraits {
///   using owned_type = T;
///   using borrow_type = const T*;
///
///   static borrow_type createBorrow(const owned_type& from) {
///     return &from;
///   }
///
///   static void assignBorrow(borrow_type& lhs, borrow_type rhs) {
///     lhs = rhs;
///   }
///
///   static void destroyBorrow(borrow_type& toDestroy) {}
///
///   static const owned_type& referenceFromBorrow(const borrow_type& borrow) {
///     return *borrow;
///   }
///
///   static const owned_type* pointerFromBorrow(const borrow_type& borrow) {
///     return borrow;
///   }
///
///   static bool debugBorrowIsValid(const borrow_type& borrow) {
///     return borrow != nullptr;
///   }
/// };
///
/// (This implementation is not in use because MaybeOwned is an unsafe
/// abstraction and we don't want to encourage it widely, just for
/// skipping reference counting in critical paths.)
///
/// For examples that are in use, see intrusive_ptr.h and TensorBody.h.
template <typename T>
struct MaybeOwnedTraits;

/// A smart pointer around either a borrowed or owned T. When
/// constructed with borrowed(), the caller MUST ensure that the
/// borrowed-from argument outlives this MaybeOwned<T>. Compare to
/// Rust's std::borrow::Cow
/// (https://doc.rust-lang.org/std/borrow/enum.Cow.html), but note
/// that it is probably not suitable for general use because C++ has
/// no borrow checking. Included here to support
/// Tensor::expect_contiguous.
template <typename T>
class MaybeOwned final {
  using borrow_type = typename MaybeOwnedTraits<T>::borrow_type;
  using owned_type = typename MaybeOwnedTraits<T>::owned_type;

bool isBorrowed_;
  union {
    borrow_type borrow_;
    owned_type own_;
  };

/// Don't use this; use borrowed() instead.
  explicit MaybeOwned(const owned_type& t)
      : isBorrowed_(true), borrow_(MaybeOwnedTraits<T>::createBorrow(t)) {}

/// Don't use this; use owned() instead.
  explicit MaybeOwned(T&& t) noexcept(
      std::is_nothrow_move_constructible<T>::value)
      : isBorrowed_(false), own_(std::move(t)) {}

/// Don't use this; use owned() instead.
  template <class... Args>
  explicit MaybeOwned(in_place_t, Args&&... args)
      : isBorrowed_(false), own_(std::forward<Args>(args)...) {}

public:
  explicit MaybeOwned() : isBorrowed_(true), borrow_() {}

// Copying a borrow yields another borrow of the original, as with a
  // T*. Copying an owned T yields another owned T for safety: no
  // chains of borrowing by default! (Note you could get that behavior
  // with MaybeOwned<T>::borrowed(*rhs) if you wanted it.)
  MaybeOwned(const MaybeOwned& rhs) : isBorrowed_(rhs.isBorrowed_) {
    if (C10_LIKELY(rhs.isBorrowed_)) {
      MaybeOwnedTraits<T>::assignBorrow(borrow_, rhs.borrow_);
    } else {
      new (&own_) T(rhs.own_);
    }
  }

MaybeOwned& operator=(const MaybeOwned& rhs) {
    if (this == &rhs) {
      return *this;
    }
    if (C10_UNLIKELY(!isBorrowed_)) {
      if (rhs.isBorrowed_) {
        own_.~T();
        MaybeOwnedTraits<T>::assignBorrow(borrow_, rhs.borrow_);
        isBorrowed_ = true;
      } else {
        own_ = rhs.own_;
      }
    } else {
      if (C10_LIKELY(rhs.isBorrowed_)) {
        MaybeOwnedTraits<T>::assignBorrow(borrow_, rhs.borrow_);
      } else {
        MaybeOwnedTraits<T>::destroyBorrow(borrow_);
        new (&own_) T(rhs.own_);
        isBorrowed_ = false;
      }
    }
    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(isBorrowed_ == rhs.isBorrowed_);
    return *this;
  }

MaybeOwned(MaybeOwned&& rhs) noexcept(
      std::is_nothrow_move_constructible<T>::value)
      : isBorrowed_(rhs.isBorrowed_) {
    if (C10_LIKELY(rhs.isBorrowed_)) {
      MaybeOwnedTraits<T>::assignBorrow(borrow_, rhs.borrow_);
    } else {
      new (&own_) T(std::move(rhs.own_));
    }
  }

MaybeOwned& operator=(MaybeOwned&& rhs) noexcept(
      std::is_nothrow_move_assignable<T>::value) {
    if (this == &rhs) {
      return *this;
    }
    if (C10_UNLIKELY(!isBorrowed_)) {
      if (rhs.isBorrowed_) {
        own_.~T();
        MaybeOwnedTraits<T>::assignBorrow(borrow_, rhs.borrow_);
        isBorrowed_ = true;
      } else {
        own_ = std::move(rhs.own_);
      }
    } else {
      if (C10_LIKELY(rhs.isBorrowed_)) {
        MaybeOwnedTraits<T>::assignBorrow(borrow_, rhs.borrow_);
      } else {
        MaybeOwnedTraits<T>::destroyBorrow(borrow_);
        new (&own_) T(std::move(rhs.own_));
        isBorrowed_ = false;
      }
    }
    TORCH_INTERNAL_ASSERT_DEBUG_ONLY(isBorrowed_ == rhs.isBorrowed_);
    return *this;
  }

static MaybeOwned borrowed(const T& t) {
    return MaybeOwned(t);
  }

static MaybeOwned owned(T&& t) noexcept(
      std::is_nothrow_move_constructible<T>::value) {
    return MaybeOwned(std::move(t));
  }

template <class... Args>
  static MaybeOwned owned(in_place_t, Args&&... args) {
    return MaybeOwned(in_place, std::forward<Args>(args)...);
  }

~MaybeOwned() {
    if (C10_UNLIKELY(!isBorrowed_)) {
      own_.~T();
    } else {
      MaybeOwnedTraits<T>::destroyBorrow(borrow_);
    }
  }

// This is an implementation detail!  You should know what you're doing
  // if you are testing this.  If you just want to guarantee ownership move
  // this into a T
  bool unsafeIsBorrowed() const {
    return isBorrowed_;
  }

const T& operator*() const& {
    if (isBorrowed_) {
      TORCH_INTERNAL_ASSERT_DEBUG_ONLY(
          MaybeOwnedTraits<T>::debugBorrowIsValid(borrow_));
    }
    return C10_LIKELY(isBorrowed_)
        ? MaybeOwnedTraits<T>::referenceFromBorrow(borrow_)
        : own_;
  }

const T* operator->() const {
    if (isBorrowed_) {
      TORCH_INTERNAL_ASSERT_DEBUG_ONLY(
          MaybeOwnedTraits<T>::debugBorrowIsValid(borrow_));
    }
    return C10_LIKELY(isBorrowed_)
        ? MaybeOwnedTraits<T>::pointerFromBorrow(borrow_)
        : &own_;
  }

// If borrowed, copy the underlying T. If owned, move from
  // it. borrowed/owned state remains the same, and either we
  // reference the same borrow as before or we are an owned moved-from
  // T.
  T operator*() && {
    if (isBorrowed_) {
      TORCH_INTERNAL_ASSERT_DEBUG_ONLY(
          MaybeOwnedTraits<T>::debugBorrowIsValid(borrow_));
      return MaybeOwnedTraits<T>::referenceFromBorrow(borrow_);
    } else {
      return std::move(own_);
    }
  }
};

} // namespace c10

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