unique_handle.hpp

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// SPDX-License-Identifier: LGPL-2.1-or-later
#pragma once
 
#include <utility>
 
namespace sshpp::detail {
 
template <class Handle, class Deleter>
class UniqueHandle {
public:
    UniqueHandle() = default;
    explicit UniqueHandle(Handle h) noexcept : h_(h) {}
 
    UniqueHandle(UniqueHandle&& o) noexcept : h_(std::exchange(o.h_, Handle{})) {}
    UniqueHandle& operator=(UniqueHandle&& o) noexcept {
        if (this != &o) {
            reset();
            h_ = std::exchange(o.h_, Handle{});
        }
        return *this;
    }
 
    UniqueHandle(const UniqueHandle&)            = delete;
    UniqueHandle& operator=(const UniqueHandle&) = delete;
 
    ~UniqueHandle() { reset(); }
 
    Handle get() const noexcept { return h_; }
    explicit operator bool() const noexcept { return h_ != Handle{}; }
 
    [[nodiscard]] Handle release() noexcept { return std::exchange(h_, Handle{}); }
 
    void reset(Handle h = Handle{}) noexcept {
        if (h_ != Handle{}) {
            Deleter{}(h_);
        }
        h_ = h;
    }
 
private:
    Handle h_{};
};
 
} // namespace sshpp::detail