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// Copyright 2017 Elias Kosunen
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file is a part of scnlib:
// https://github.com/eliaskosunen/scnlib
#ifndef SCN_UTIL_UNIQUE_PTR_H
#define SCN_UTIL_UNIQUE_PTR_H
#include "../detail/fwd.h"
#include <type_traits>
namespace scn {
SCN_BEGIN_NAMESPACE
namespace detail {
/**
* `std::unique_ptr` implementation with [[clang::trivial_abi]], without
* including `<memory>`
*/
template <typename T>
class SCN_TRIVIAL_ABI unique_ptr {
public:
using element_type = T;
using pointer = T*;
constexpr unique_ptr() noexcept = default;
constexpr unique_ptr(std::nullptr_t) noexcept {}
constexpr explicit unique_ptr(pointer p) noexcept : m_ptr(p) {}
template <
typename U,
typename std::enable_if<
std::is_convertible<U*, pointer>::value>::type* = nullptr>
SCN_CONSTEXPR14 unique_ptr(unique_ptr<U>&& u) noexcept
: m_ptr(SCN_MOVE(u.get()))
{
u.reset();
}
unique_ptr(const unique_ptr&) = delete;
unique_ptr& operator=(const unique_ptr&) = delete;
SCN_CONSTEXPR14 unique_ptr(unique_ptr&& p) noexcept
: m_ptr(SCN_MOVE(p.m_ptr))
{
p.m_ptr = nullptr;
}
unique_ptr& operator=(unique_ptr&& p) noexcept
{
delete m_ptr;
m_ptr = p.m_ptr;
p.m_ptr = nullptr;
return *this;
}
~unique_ptr() noexcept
{
SCN_CLANG_PUSH_IGNORE_UNDEFINED_TEMPLATE
delete m_ptr;
SCN_CLANG_POP_IGNORE_UNDEFINED_TEMPLATE
}
constexpr explicit operator bool() const noexcept
{
return get() != nullptr;
}
constexpr pointer get() const noexcept
{
return m_ptr;
}
constexpr pointer operator->() const noexcept
{
return m_ptr;
}
constexpr typename std::add_lvalue_reference<T>::type operator*()
const
{
return *m_ptr;
}
SCN_CONSTEXPR14 void reset()
{
m_ptr = nullptr;
}
private:
pointer m_ptr{nullptr};
};
template <typename T, typename... Args>
unique_ptr<T> make_unique(Args&&... a)
{
SCN_CLANG_PUSH_IGNORE_UNDEFINED_TEMPLATE
return unique_ptr<T>(new T(SCN_FWD(a)...));
SCN_CLANG_POP_IGNORE_UNDEFINED_TEMPLATE
}
} // namespace detail
SCN_END_NAMESPACE
} // namespace scn
#endif
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