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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#ifdef HAVE_CPP_STDLIB
# include "opentelemetry/std/unique_ptr.h"
#else
# include <cstddef>
# include <memory>
# include <type_traits>
# include <utility>
# include "opentelemetry/version.h"
OPENTELEMETRY_BEGIN_NAMESPACE
namespace nostd
{
namespace detail
{
template <class T>
struct unique_ptr_element_type
{
using type = T;
};
template <class T>
struct unique_ptr_element_type<T[]>
{
using type = T;
};
} // namespace detail
/**
* Provide a simplified port of std::unique_ptr that has ABI stability.
*
* Note: This implementation doesn't allow for a custom deleter.
*/
template <class T>
class unique_ptr
{
public:
using element_type = typename detail::unique_ptr_element_type<T>::type;
using pointer = element_type *;
unique_ptr() noexcept : ptr_{nullptr} {}
unique_ptr(std::nullptr_t) noexcept : ptr_{nullptr} {}
explicit unique_ptr(pointer ptr) noexcept : ptr_{ptr} {}
unique_ptr(unique_ptr &&other) noexcept : ptr_{other.release()} {}
template <class U,
typename std::enable_if<std::is_convertible<U *, pointer>::value>::type * = nullptr>
unique_ptr(unique_ptr<U> &&other) noexcept : ptr_{other.release()}
{}
template <class U,
typename std::enable_if<std::is_convertible<U *, pointer>::value>::type * = nullptr>
unique_ptr(std::unique_ptr<U> &&other) noexcept : ptr_{other.release()}
{}
~unique_ptr() { reset(); }
unique_ptr &operator=(unique_ptr &&other) noexcept
{
reset(other.release());
return *this;
}
unique_ptr &operator=(std::nullptr_t) noexcept
{
reset();
return *this;
}
template <class U,
typename std::enable_if<std::is_convertible<U *, pointer>::value>::type * = nullptr>
unique_ptr &operator=(unique_ptr<U> &&other) noexcept
{
reset(other.release());
return *this;
}
template <class U,
typename std::enable_if<std::is_convertible<U *, pointer>::value>::type * = nullptr>
unique_ptr &operator=(std::unique_ptr<U> &&other) noexcept
{
reset(other.release());
return *this;
}
operator std::unique_ptr<T>() &&noexcept { return std::unique_ptr<T>{release()}; }
operator bool() const noexcept { return ptr_ != nullptr; }
element_type &operator*() const noexcept { return *ptr_; }
pointer operator->() const noexcept { return get(); }
pointer get() const noexcept { return ptr_; }
void reset(pointer ptr = nullptr) noexcept
{
if (ptr_ != nullptr)
{
this->delete_ptr();
}
ptr_ = ptr;
}
pointer release() noexcept
{
auto result = ptr_;
ptr_ = nullptr;
return result;
}
void swap(unique_ptr &other) noexcept { std::swap(ptr_, other.ptr_); }
private:
pointer ptr_;
void delete_ptr() noexcept
{
if (std::is_array<T>::value)
{
delete[] ptr_;
}
else
{
delete ptr_;
}
}
};
template <class T1, class T2>
bool operator==(const unique_ptr<T1> &lhs, const unique_ptr<T2> &rhs) noexcept
{
return lhs.get() == rhs.get();
}
template <class T>
bool operator==(const unique_ptr<T> &lhs, std::nullptr_t) noexcept
{
return lhs.get() == nullptr;
}
template <class T>
bool operator==(std::nullptr_t, const unique_ptr<T> &rhs) noexcept
{
return nullptr == rhs.get();
}
template <class T1, class T2>
bool operator!=(const unique_ptr<T1> &lhs, const unique_ptr<T2> &rhs) noexcept
{
return lhs.get() != rhs.get();
}
template <class T>
bool operator!=(const unique_ptr<T> &lhs, std::nullptr_t) noexcept
{
return lhs.get() != nullptr;
}
template <class T>
bool operator!=(std::nullptr_t, const unique_ptr<T> &rhs) noexcept
{
return nullptr != rhs.get();
}
} // namespace nostd
OPENTELEMETRY_END_NAMESPACE
#endif
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