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 // Copyright 2017 The Abseil Authors.
 //
 // Licensed 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
 //
 //      https://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.
 
 #ifndef ABSL_CONTAINER_INTERNAL_TEST_INSTANCE_TRACKER_H_
 #define ABSL_CONTAINER_INTERNAL_TEST_INSTANCE_TRACKER_H_
 
 #include <cstdlib>
 #include <ostream>
 
 #include "absl/types/compare.h"
 
 namespace absl {
 ABSL_NAMESPACE_BEGIN
 namespace test_internal {
 
 // A type that counts number of occurrences of the type, the live occurrences of
 // the type, as well as the number of copies, moves, swaps, and comparisons that
 // have occurred on the type. This is used as a base class for the copyable,
 // copyable+movable, and movable types below that are used in actual tests. Use
 // InstanceTracker in tests to track the number of instances.
 class BaseCountedInstance {
  public:
   explicit BaseCountedInstance(int x) : value_(x) {
     ++num_instances_;
     ++num_live_instances_;
   }
   BaseCountedInstance(const BaseCountedInstance& x)
       : value_(x.value_), is_live_(x.is_live_) {
     ++num_instances_;
     if (is_live_) ++num_live_instances_;
     ++num_copies_;
   }
   BaseCountedInstance(BaseCountedInstance&& x)
       : value_(x.value_), is_live_(x.is_live_) {
     x.is_live_ = false;
     ++num_instances_;
     ++num_moves_;
   }
   ~BaseCountedInstance() {
     --num_instances_;
     if (is_live_) --num_live_instances_;
   }
 
   BaseCountedInstance& operator=(const BaseCountedInstance& x) {
     value_ = x.value_;
     if (is_live_) --num_live_instances_;
     is_live_ = x.is_live_;
     if (is_live_) ++num_live_instances_;
     ++num_copies_;
     return *this;
   }
   BaseCountedInstance& operator=(BaseCountedInstance&& x) {
     value_ = x.value_;
     if (is_live_) --num_live_instances_;
     is_live_ = x.is_live_;
     x.is_live_ = false;
     ++num_moves_;
     return *this;
   }
 
   bool operator==(const BaseCountedInstance& x) const {
     ++num_comparisons_;
     return value_ == x.value_;
   }
 
   bool operator!=(const BaseCountedInstance& x) const {
     ++num_comparisons_;
     return value_ != x.value_;
   }
 
   bool operator<(const BaseCountedInstance& x) const {
     ++num_comparisons_;
     return value_ < x.value_;
   }
 
   bool operator>(const BaseCountedInstance& x) const {
     ++num_comparisons_;
     return value_ > x.value_;
   }
 
   bool operator<=(const BaseCountedInstance& x) const {
     ++num_comparisons_;
     return value_ <= x.value_;
   }
 
   bool operator>=(const BaseCountedInstance& x) const {
     ++num_comparisons_;
     return value_ >= x.value_;
   }
 
   absl::weak_ordering compare(const BaseCountedInstance& x) const {
     ++num_comparisons_;
     return value_ < x.value_
                ? absl::weak_ordering::less
                : value_ == x.value_ ? absl::weak_ordering::equivalent
                                     : absl::weak_ordering::greater;
   }
 
   int value() const {
     if (!is_live_) std::abort();
     return value_;
   }
 
   friend std::ostream& operator<<(std::ostream& o,
                                   const BaseCountedInstance& v) {
     return o << "[value:" << v.value() << "]";
   }
 
   // Implementation of efficient swap() that counts swaps.
   static void SwapImpl(
       BaseCountedInstance& lhs,    // NOLINT(runtime/references)
       BaseCountedInstance& rhs) {  // NOLINT(runtime/references)
     using std::swap;
     swap(lhs.value_, rhs.value_);
     swap(lhs.is_live_, rhs.is_live_);
     ++BaseCountedInstance::num_swaps_;
   }
 
  private:
   friend class InstanceTracker;
 
   int value_;
 
   // Indicates if the value is live, ie it hasn't been moved away from.
   bool is_live_ = true;
 
   // Number of instances.
   static int num_instances_;
 
   // Number of live instances (those that have not been moved away from.)
   static int num_live_instances_;
 
   // Number of times that BaseCountedInstance objects were moved.
   static int num_moves_;
 
   // Number of times that BaseCountedInstance objects were copied.
   static int num_copies_;
 
   // Number of times that BaseCountedInstance objects were swapped.
   static int num_swaps_;
 
   // Number of times that BaseCountedInstance objects were compared.
   static int num_comparisons_;
 };
 
 // Helper to track the BaseCountedInstance instance counters. Expects that the
 // number of instances and live_instances are the same when it is constructed
 // and when it is destructed.
 class InstanceTracker {
  public:
   InstanceTracker()
       : start_instances_(BaseCountedInstance::num_instances_),
         start_live_instances_(BaseCountedInstance::num_live_instances_) {
     ResetCopiesMovesSwaps();
   }
   ~InstanceTracker() {
     if (instances() != 0) std::abort();
     if (live_instances() != 0) std::abort();
   }
 
   // Returns the number of BaseCountedInstance instances both containing valid
   // values and those moved away from compared to when the InstanceTracker was
   // constructed
   int instances() const {
     return BaseCountedInstance::num_instances_ - start_instances_;
   }
 
   // Returns the number of live BaseCountedInstance instances compared to when
   // the InstanceTracker was constructed
   int live_instances() const {
     return BaseCountedInstance::num_live_instances_ - start_live_instances_;
   }
 
   // Returns the number of moves on BaseCountedInstance objects since
   // construction or since the last call to ResetCopiesMovesSwaps().
   int moves() const { return BaseCountedInstance::num_moves_ - start_moves_; }
 
   // Returns the number of copies on BaseCountedInstance objects since
   // construction or the last call to ResetCopiesMovesSwaps().
   int copies() const {
     return BaseCountedInstance::num_copies_ - start_copies_;
   }
 
   // Returns the number of swaps on BaseCountedInstance objects since
   // construction or the last call to ResetCopiesMovesSwaps().
   int swaps() const { return BaseCountedInstance::num_swaps_ - start_swaps_; }
 
   // Returns the number of comparisons on BaseCountedInstance objects since
   // construction or the last call to ResetCopiesMovesSwaps().
   int comparisons() const {
     return BaseCountedInstance::num_comparisons_ - start_comparisons_;
   }
 
   // Resets the base values for moves, copies, comparisons, and swaps to the
   // current values, so that subsequent Get*() calls for moves, copies,
   // comparisons, and swaps will compare to the situation at the point of this
   // call.
   void ResetCopiesMovesSwaps() {
     start_moves_ = BaseCountedInstance::num_moves_;
     start_copies_ = BaseCountedInstance::num_copies_;
     start_swaps_ = BaseCountedInstance::num_swaps_;
     start_comparisons_ = BaseCountedInstance::num_comparisons_;
   }
 
  private:
   int start_instances_;
   int start_live_instances_;
   int start_moves_;
   int start_copies_;
   int start_swaps_;
   int start_comparisons_;
 };
 
 // Copyable, not movable.
 class CopyableOnlyInstance : public BaseCountedInstance {
  public:
   explicit CopyableOnlyInstance(int x) : BaseCountedInstance(x) {}
   CopyableOnlyInstance(const CopyableOnlyInstance& rhs) = default;
   CopyableOnlyInstance& operator=(const CopyableOnlyInstance& rhs) = default;
 
   friend void swap(CopyableOnlyInstance& lhs, CopyableOnlyInstance& rhs) {
     BaseCountedInstance::SwapImpl(lhs, rhs);
   }
 
   static bool supports_move() { return false; }
 };
 
 // Copyable and movable.
 class CopyableMovableInstance : public BaseCountedInstance {
  public:
   explicit CopyableMovableInstance(int x) : BaseCountedInstance(x) {}
   CopyableMovableInstance(const CopyableMovableInstance& rhs) = default;
   CopyableMovableInstance(CopyableMovableInstance&& rhs) = default;
   CopyableMovableInstance& operator=(const CopyableMovableInstance& rhs) =
       default;
   CopyableMovableInstance& operator=(CopyableMovableInstance&& rhs) = default;
 
   friend void swap(CopyableMovableInstance& lhs, CopyableMovableInstance& rhs) {
     BaseCountedInstance::SwapImpl(lhs, rhs);
   }
 
   static bool supports_move() { return true; }
 };
 
 // Only movable, not default-constructible.
 class MovableOnlyInstance : public BaseCountedInstance {
  public:
   explicit MovableOnlyInstance(int x) : BaseCountedInstance(x) {}
   MovableOnlyInstance(MovableOnlyInstance&& other) = default;
   MovableOnlyInstance& operator=(MovableOnlyInstance&& other) = default;
 
   friend void swap(MovableOnlyInstance& lhs, MovableOnlyInstance& rhs) {
     BaseCountedInstance::SwapImpl(lhs, rhs);
   }
 
   static bool supports_move() { return true; }
 };
 
 }  // namespace test_internal
 ABSL_NAMESPACE_END
 }  // namespace absl
 
 #endif  // ABSL_CONTAINER_INTERNAL_TEST_INSTANCE_TRACKER_H_

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