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#ifndef ADHOCUTIL_HANDLE_H
#define ADHOCUTIL_HANDLE_H
#include "c++11Helpers.h"
#include <utility>
namespace AdHoc {
/// A unique_ptr like construct for non-pointer objects.
/// Implements RAII.
template<typename T, typename D> class Handle {
public:
/// Constructs a Handle that owns t, to be tidied with d
Handle(T t, D d) noexcept : inst(std::move(t)), deleter(std::move(d)), owning(true) { }
/// Constructs a Handle that takes over ownership of h
Handle(Handle && h) noexcept : inst(std::move(h.inst)), deleter(std::move(h.deleter)), owning(h.owning)
{
h.owning = false;
}
~Handle()
{
if (owning) {
deleter(inst);
}
}
/// Standard special members
SPECIAL_MEMBERS_COPY(Handle, delete);
/// Takes over ownership of h
Handle &
operator=(Handle && h) noexcept
{
if (owning) {
deleter(inst);
}
inst = std::move(h.inst);
deleter = std::move(h.deleter);
owning = h.owning;
h.owning = false;
return *this;
}
/// Returns a reference to the managed object.
[[nodiscard]] T &
get() noexcept
{
return inst;
}
/// Returns a const reference to the managed object.
[[nodiscard]] const T &
get() const noexcept
{
return inst;
}
/// Returns a pointer to the managed object.
[[nodiscard]] T *
operator->() noexcept
{
return inst;
}
/// Returns a const pointer to the managed object.
[[nodiscard]] const T *
operator->() const noexcept
{
return inst;
}
/// Returns a reference to the managed object.
[[nodiscard]] T &
operator*() noexcept
{
return inst;
}
/// Returns a const reference to the managed object.
[[nodiscard]] const T &
operator*() const noexcept
{
return inst;
}
/// Returns a reference to the managed object.
// NOLINTNEXTLINE(hicpp-explicit-conversions)
operator T &() noexcept
{
return inst;
}
/// Returns a const reference to the managed object.
// NOLINTNEXTLINE(hicpp-explicit-conversions)
operator const T &() const noexcept
{
return inst;
}
private:
T inst;
D deleter;
bool owning;
};
template<typename T, typename D, typename... Args>
Handle<T, D>
make_handle(D && d, Args &&... args)
{
return {T(std::forward<Args>(args)...), std::forward<D>(d)};
}
}
#endif
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