- import libcxx - reduce targets to the one when compiled as a tools Change-Id: Iabb8427f80ff8e89463559a28bcb8b4f2bdbc496
252 lines
7 KiB
C++
252 lines
7 KiB
C++
#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
|