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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <memory>
// unique_ptr
// Example move-only deleter
#ifndef DELETER_H
#define DELETER_H
#include <type_traits>
#include <utility>
#include <cassert>
template <class T>
class Deleter
{
int state_;
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
Deleter(const Deleter&);
Deleter& operator=(const Deleter&);
#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Deleter(Deleter&);
Deleter& operator=(Deleter&);
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
public:
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
Deleter(Deleter&& r) : state_(r.state_) {r.state_ = 0;}
Deleter& operator=(Deleter&& r)
{
state_ = r.state_;
r.state_ = 0;
return *this;
}
#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
operator std::__rv<Deleter>() {return std::__rv<Deleter>(*this);}
Deleter(std::__rv<Deleter> r) : state_(r->state_) {r->state_ = 0;}
Deleter& operator=(std::__rv<Deleter> r)
{
state_ = r->state_;
r->state_ = 0;
return *this;
}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Deleter() : state_(0) {}
explicit Deleter(int s) : state_(s) {}
~Deleter() {assert(state_ >= 0); state_ = -1;}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class U>
Deleter(Deleter<U>&& d,
typename std::enable_if<!std::is_same<U, T>::value>::type* = 0)
: state_(d.state()) {d.set_state(0);}
private:
template <class U>
Deleter(const Deleter<U>& d,
typename std::enable_if<!std::is_same<U, T>::value>::type* = 0);
#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class U>
Deleter(Deleter<U> d,
typename std::enable_if<!std::is_same<U, T>::value>::type* = 0)
: state_(d.state()) {}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
public:
int state() const {return state_;}
void set_state(int i) {state_ = i;}
void operator()(T* p) {delete p;}
};
template <class T>
class Deleter<T[]>
{
int state_;
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
Deleter(const Deleter&);
Deleter& operator=(const Deleter&);
#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Deleter(Deleter&);
Deleter& operator=(Deleter&);
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
public:
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
Deleter(Deleter&& r) : state_(r.state_) {r.state_ = 0;}
Deleter& operator=(Deleter&& r)
{
state_ = r.state_;
r.state_ = 0;
return *this;
}
#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
operator std::__rv<Deleter>() {return std::__rv<Deleter>(*this);}
Deleter(std::__rv<Deleter> r) : state_(r->state_) {r->state_ = 0;}
Deleter& operator=(std::__rv<Deleter> r)
{
state_ = r->state_;
r->state_ = 0;
return *this;
}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
Deleter() : state_(0) {}
explicit Deleter(int s) : state_(s) {}
~Deleter() {assert(state_ >= 0); state_ = -1;}
int state() const {return state_;}
void set_state(int i) {state_ = i;}
void operator()(T* p) {delete [] p;}
};
template <class T>
void
swap(Deleter<T>& x, Deleter<T>& y)
{
Deleter<T> t(std::move(x));
x = std::move(y);
y = std::move(t);
}
template <class T>
class CDeleter
{
int state_;
public:
CDeleter() : state_(0) {}
explicit CDeleter(int s) : state_(s) {}
~CDeleter() {assert(state_ >= 0); state_ = -1;}
template <class U>
CDeleter(const CDeleter<U>& d)
: state_(d.state()) {}
int state() const {return state_;}
void set_state(int i) {state_ = i;}
void operator()(T* p) {delete p;}
};
template <class T>
class CDeleter<T[]>
{
int state_;
public:
CDeleter() : state_(0) {}
explicit CDeleter(int s) : state_(s) {}
~CDeleter() {assert(state_ >= 0); state_ = -1;}
int state() const {return state_;}
void set_state(int i) {state_ = i;}
void operator()(T* p) {delete [] p;}
};
template <class T>
void
swap(CDeleter<T>& x, CDeleter<T>& y)
{
CDeleter<T> t(std::move(x));
x = std::move(y);
y = std::move(t);
}
#endif // DELETER_H
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