92 lines
2.0 KiB
C++
92 lines
2.0 KiB
C++
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#pragma once
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#include <libremidi/config.hpp>
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#include <boost/asio/ip/udp.hpp>
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#include <memory>
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namespace stdx
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{ /*
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class boost_system_error_domain : public error_domain
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{
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public:
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constexpr boost_system_error_domain() noexcept
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: error_domain{
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{1 - 0x3c223c0aa3cf45e5ULL, 1 - 0x80dac24345cfb9fcULL},
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default_error_resource_management_t<detail::exception_ptr_wrapper>{}}
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{
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}
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string_ref name() const noexcept override { return "boost::system_error domain"; }
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bool equivalent(const error& lhs, const error& rhs) const noexcept override { return false; }
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string_ref message(const error& e) const noexcept override {
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auto err = e.m_value;
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}
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[[noreturn]] void throw_exception(const error& e) const override
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{
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assert(e.domain() == *this);
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std::rethrow_exception(error_cast<detail::exception_ptr_wrapper>(e).get());
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}
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};
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*/
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}
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namespace libremidi
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{
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template <typename T>
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struct optionally_owned
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{
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public:
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explicit optionally_owned(T* maybe_existing)
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: storage{.ref = maybe_existing}
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{
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if (storage.ref)
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{
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ownership = unowned;
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return;
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}
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else
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{
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std::destroy_at(&storage.ref);
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std::construct_at<T>(reinterpret_cast<T*>(storage.object));
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ownership = owned;
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}
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}
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~optionally_owned()
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{
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if (is_owned())
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std::destroy_at(reinterpret_cast<T*>(storage.object));
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}
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T& get() noexcept { return *(is_owned() ? reinterpret_cast<T*>(&storage.object) : storage.ref); }
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const T& get() const noexcept
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{
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return *(is_owned() ? reinterpret_cast<T*>(&storage.object) : storage.ref);
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}
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optionally_owned(const optionally_owned&) = delete;
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optionally_owned(optionally_owned&&) noexcept = delete;
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optionally_owned& operator=(const optionally_owned&) = delete;
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optionally_owned& operator=(optionally_owned&&) noexcept = delete;
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bool is_owned() const noexcept { return ownership == owned; }
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private:
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union
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{
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alignas(T) unsigned char object[sizeof(T)];
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T* ref;
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} storage;
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enum
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{
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owned,
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unowned
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} ownership{};
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};
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}
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