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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.
//
//===----------------------------------------------------------------------===//
#ifndef MIN_ALLOCATOR_H
#define MIN_ALLOCATOR_H
#if __cplusplus >= 201103L
#include <memory>
template <class T> class min_pointer;
template <class T> class min_pointer<const T>;
template <> class min_pointer<void>;
template <> class min_pointer<const void>;
template <class T> class min_allocator;
template <>
class min_pointer<const void>
{
const void* ptr_;
public:
min_pointer() noexcept = default;
min_pointer(std::nullptr_t) : ptr_(nullptr) {}
template <class T>
min_pointer(min_pointer<T> p) : ptr_(p.ptr_) {}
explicit operator bool() const {return ptr_ != nullptr;}
friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
template <class U> friend class min_pointer;
};
template <>
class min_pointer<void>
{
void* ptr_;
public:
min_pointer() noexcept = default;
min_pointer(std::nullptr_t) : ptr_(nullptr) {}
template <class T,
class = typename std::enable_if
<
!std::is_const<T>::value
>::type
>
min_pointer(min_pointer<T> p) : ptr_(p.ptr_) {}
explicit operator bool() const {return ptr_ != nullptr;}
friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
template <class U> friend class min_pointer;
};
template <class T>
class min_pointer
{
T* ptr_;
explicit min_pointer(T* p) : ptr_(p) {}
public:
min_pointer() noexcept = default;
min_pointer(std::nullptr_t) : ptr_(nullptr) {}
explicit min_pointer(min_pointer<void> p) : ptr_(static_cast<T*>(p.ptr_)) {}
explicit operator bool() const {return ptr_ != nullptr;}
typedef std::ptrdiff_t difference_type;
typedef T& reference;
typedef T* pointer;
typedef T value_type;
typedef std::random_access_iterator_tag iterator_category;
reference operator*() const {return *ptr_;}
pointer operator->() const {return ptr_;}
min_pointer& operator++() {++ptr_; return *this;}
min_pointer operator++(int) {min_pointer tmp(*this); ++ptr_; return tmp;}
min_pointer& operator--() {--ptr_; return *this;}
min_pointer operator--(int) {min_pointer tmp(*this); --ptr_; return tmp;}
min_pointer& operator+=(difference_type n) {ptr_ += n; return *this;}
min_pointer& operator-=(difference_type n) {ptr_ -= n; return *this;}
min_pointer operator+(difference_type n) const
{
min_pointer tmp(*this);
tmp += n;
return tmp;
}
friend min_pointer operator+(difference_type n, min_pointer x)
{
return x + n;
}
min_pointer operator-(difference_type n) const
{
min_pointer tmp(*this);
tmp -= n;
return tmp;
}
friend difference_type operator-(min_pointer x, min_pointer y)
{
return x.ptr_ - y.ptr_;
}
reference operator[](difference_type n) const {return ptr_[n];}
friend bool operator< (min_pointer x, min_pointer y) {return x.ptr_ < y.ptr_;}
friend bool operator> (min_pointer x, min_pointer y) {return y < x;}
friend bool operator<=(min_pointer x, min_pointer y) {return !(y < x);}
friend bool operator>=(min_pointer x, min_pointer y) {return !(x < y);}
static min_pointer pointer_to(T& t) {return min_pointer(std::addressof(t));}
friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
template <class U> friend class min_pointer;
template <class U> friend class min_allocator;
};
template <class T>
class min_pointer<const T>
{
const T* ptr_;
explicit min_pointer(const T* p) : ptr_(p) {}
public:
min_pointer() noexcept = default;
min_pointer(std::nullptr_t) : ptr_(nullptr) {}
min_pointer(min_pointer<T> p) : ptr_(p.ptr_) {}
explicit min_pointer(min_pointer<const void> p) : ptr_(static_cast<const T*>(p.ptr_)) {}
explicit operator bool() const {return ptr_ != nullptr;}
typedef std::ptrdiff_t difference_type;
typedef const T& reference;
typedef const T* pointer;
typedef const T value_type;
typedef std::random_access_iterator_tag iterator_category;
reference operator*() const {return *ptr_;}
pointer operator->() const {return ptr_;}
min_pointer& operator++() {++ptr_; return *this;}
min_pointer operator++(int) {min_pointer tmp(*this); ++ptr_; return tmp;}
min_pointer& operator--() {--ptr_; return *this;}
min_pointer operator--(int) {min_pointer tmp(*this); --ptr_; return tmp;}
min_pointer& operator+=(difference_type n) {ptr_ += n; return *this;}
min_pointer& operator-=(difference_type n) {ptr_ -= n; return *this;}
min_pointer operator+(difference_type n) const
{
min_pointer tmp(*this);
tmp += n;
return tmp;
}
friend min_pointer operator+(difference_type n, min_pointer x)
{
return x + n;
}
min_pointer operator-(difference_type n) const
{
min_pointer tmp(*this);
tmp -= n;
return tmp;
}
friend difference_type operator-(min_pointer x, min_pointer y)
{
return x.ptr_ - y.ptr_;
}
reference operator[](difference_type n) const {return ptr_[n];}
friend bool operator< (min_pointer x, min_pointer y) {return x.ptr_ < y.ptr_;}
friend bool operator> (min_pointer x, min_pointer y) {return y < x;}
friend bool operator<=(min_pointer x, min_pointer y) {return !(y < x);}
friend bool operator>=(min_pointer x, min_pointer y) {return !(x < y);}
static min_pointer pointer_to(const T& t) {return min_pointer(std::addressof(t));}
friend bool operator==(min_pointer x, min_pointer y) {return x.ptr_ == y.ptr_;}
friend bool operator!=(min_pointer x, min_pointer y) {return !(x == y);}
template <class U> friend class min_pointer;
};
template <class T>
inline
bool
operator==(min_pointer<T> x, std::nullptr_t)
{
return !static_cast<bool>(x);
}
template <class T>
inline
bool
operator==(std::nullptr_t, min_pointer<T> x)
{
return !static_cast<bool>(x);
}
template <class T>
inline
bool
operator!=(min_pointer<T> x, std::nullptr_t)
{
return static_cast<bool>(x);
}
template <class T>
inline
bool
operator!=(std::nullptr_t, min_pointer<T> x)
{
return static_cast<bool>(x);
}
template <class T>
class min_allocator
{
public:
typedef T value_type;
typedef min_pointer<T> pointer;
min_allocator() = default;
template <class U>
min_allocator(min_allocator<U>) {}
pointer allocate(std::ptrdiff_t n)
{
return pointer(static_cast<T*>(::operator new(n*sizeof(T))));
}
void deallocate(pointer p, std::ptrdiff_t)
{
return ::operator delete(p.ptr_);
}
friend bool operator==(min_allocator, min_allocator) {return true;}
friend bool operator!=(min_allocator x, min_allocator y) {return !(x == y);}
};
#endif // __cplusplus >= 201103L
#endif // MIN_ALLOCATOR_H
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