<commit_before>//===- llvm/ADT/OwningPtr.h - Smart ptr that owns the pointee ---*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines and implements the OwningPtr class.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_OWNING_PTR_H
#define LLVM_ADT_OWNING_PTR_H

#include "llvm/Support/Compiler.h"
#include <cassert>
#include <cstddef>

namespace llvm {

/// OwningPtr smart pointer - OwningPtr mimics a built-in pointer except that it
/// guarantees deletion of the object pointed to, either on destruction of the
/// OwningPtr or via an explicit reset().  Once created, ownership of the
/// pointee object can be taken away from OwningPtr by using the take method.
template<class T>
class OwningPtr {
  OwningPtr(OwningPtr const &) LLVM_DELETED_FUNCTION;
  OwningPtr &operator=(OwningPtr const &) LLVM_DELETED_FUNCTION;
  T *Ptr;
public:
  explicit OwningPtr(T *P = 0) : Ptr(P) {}

  ~OwningPtr() {
    delete Ptr;
  }

  /// reset - Change the current pointee to the specified pointer.  Note that
  /// calling this with any pointer (including a null pointer) deletes the
  /// current pointer.
  void reset(T *P = 0) {
    if (P == Ptr) return;
    T *Tmp = Ptr;
    Ptr = P;
    delete Tmp;
  }

  /// take - Reset the owning pointer to null and return its pointer.  This does
  /// not delete the pointer before returning it.
  T *take() {
    T *Tmp = Ptr;
    Ptr = 0;
    return Tmp;
  }

  T &operator*() const {
    assert(Ptr && "Cannot dereference null pointer");
    return *Ptr;
  }

  T *operator->() const { return Ptr; }
  T *get() const { return Ptr; }
  operator bool() const { return Ptr != 0; }
  bool operator!() const { return Ptr == 0; }

  void swap(OwningPtr &RHS) {
    T *Tmp = RHS.Ptr;
    RHS.Ptr = Ptr;
    Ptr = Tmp;
  }
};

template<class T>
inline void swap(OwningPtr<T> &a, OwningPtr<T> &b) {
  a.swap(b);
}

/// OwningArrayPtr smart pointer - OwningArrayPtr provides the same
///  functionality as OwningPtr, except that it works for array types.
template<class T>
class OwningArrayPtr {
  OwningArrayPtr(OwningArrayPtr const &) LLVM_DELETED_FUNCTION;
  OwningArrayPtr &operator=(OwningArrayPtr const &) LLVM_DELETED_FUNCTION;
  T *Ptr;
public:
  explicit OwningArrayPtr(T *P = 0) : Ptr(P) {}

  ~OwningArrayPtr() {
    delete [] Ptr;
  }

  /// reset - Change the current pointee to the specified pointer.  Note that
  /// calling this with any pointer (including a null pointer) deletes the
  /// current pointer.
  void reset(T *P = 0) {
    if (P == Ptr) return;
    T *Tmp = Ptr;
    Ptr = P;
    delete [] Tmp;
  }

  /// take - Reset the owning pointer to null and return its pointer.  This does
  /// not delete the pointer before returning it.
  T *take() {
    T *Tmp = Ptr;
    Ptr = 0;
    return Tmp;
  }

  T &operator[](std::ptrdiff_t i) const {
    assert(Ptr && "Cannot dereference null pointer");
    return Ptr[i];
  }
<commit_msg>Add move constructors for OwningPtr and OwningArrayPtr.<commit_after>//===- llvm/ADT/OwningPtr.h - Smart ptr that owns the pointee ---*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines and implements the OwningPtr class.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_ADT_OWNING_PTR_H
#define LLVM_ADT_OWNING_PTR_H

#include "llvm/Support/Compiler.h"
#include <cassert>
#include <cstddef>

namespace llvm {

/// OwningPtr smart pointer - OwningPtr mimics a built-in pointer except that it
/// guarantees deletion of the object pointed to, either on destruction of the
/// OwningPtr or via an explicit reset().  Once created, ownership of the
/// pointee object can be taken away from OwningPtr by using the take method.
template<class T>
class OwningPtr {
  OwningPtr(OwningPtr const &) LLVM_DELETED_FUNCTION;
  OwningPtr &operator=(OwningPtr const &) LLVM_DELETED_FUNCTION;
  T *Ptr;
public:
  explicit OwningPtr(T *P = 0) : Ptr(P) {}

#if LLVM_USE_RVALUE_REFERENCES
  OwningPtr(OwningPtr &&Other) : Ptr(Other.take()) {}

  OwningPtr &operator=(OwningPtr &&Other) {
    reset(Other.take());
    return *this;
  }
#endif

  ~OwningPtr() {
    delete Ptr;
  }

  /// reset - Change the current pointee to the specified pointer.  Note that
  /// calling this with any pointer (including a null pointer) deletes the
  /// current pointer.
  void reset(T *P = 0) {
    if (P == Ptr) return;
    T *Tmp = Ptr;
    Ptr = P;
    delete Tmp;
  }

  /// take - Reset the owning pointer to null and return its pointer.  This does
  /// not delete the pointer before returning it.
  T *take() {
    T *Tmp = Ptr;
    Ptr = 0;
    return Tmp;
  }

  T &operator*() const {
    assert(Ptr && "Cannot dereference null pointer");
    return *Ptr;
  }

  T *operator->() const { return Ptr; }
  T *get() const { return Ptr; }
  operator bool() const { return Ptr != 0; }
  bool operator!() const { return Ptr == 0; }

  void swap(OwningPtr &RHS) {
    T *Tmp = RHS.Ptr;
    RHS.Ptr = Ptr;
    Ptr = Tmp;
  }
};

template<class T>
inline void swap(OwningPtr<T> &a, OwningPtr<T> &b) {
  a.swap(b);
}

/// OwningArrayPtr smart pointer - OwningArrayPtr provides the same
///  functionality as OwningPtr, except that it works for array types.
template<class T>
class OwningArrayPtr {
  OwningArrayPtr(OwningArrayPtr const &) LLVM_DELETED_FUNCTION;
  OwningArrayPtr &operator=(OwningArrayPtr const &) LLVM_DELETED_FUNCTION;
  T *Ptr;
public:
  explicit OwningArrayPtr(T *P = 0) : Ptr(P) {}

#if LLVM_USE_RVALUE_REFERENCES
  OwningArrayPtr(OwningArrayPtr &&Other) : Ptr(Other.take()) {}

  OwningArrayPtr &operator=(OwningArrayPtr &&Other) {
    reset(Other.take());
    return *this;
  }
#endif

  ~OwningArrayPtr() {
    delete [] Ptr;
  }

  /// reset - Change the current pointee to the specified pointer.  Note that
  /// calling this with any pointer (including a null pointer) deletes the
  /// current pointer.
  void reset(T *P = 0) {
    if (P == Ptr) return;
    T *Tmp = Ptr;
    Ptr = P;
    delete [] Tmp;
  }

  /// take - Reset the owning pointer to null and return its pointer.  This does
  /// not delete the pointer before returning it.
  T *take() {
    T *Tmp = Ptr;
    Ptr = 0;
    return Tmp;
  }

  T &operator[](std::ptrdiff_t i) const {
    assert(Ptr && "Cannot dereference null pointer");
    return Ptr[i];
  }

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