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#pragma once
#include "asl/integers.hpp"
#include "asl/string_view.hpp"
namespace asl
{
// @Todo Make status with formatting
enum class status_code : uint8_t
{
ok = 0,
unknown = 1,
internal = 2,
runtime = 3,
invalid_argument = 4,
};
class status
{
void* m_payload{};
static constexpr void* status_to_payload(status_code code)
{
return code == status_code::ok
? nullptr
: bit_cast<void*>((static_cast<uintptr_t>(code) << 1) | 1);
}
static constexpr status_code payload_to_status(void* payload)
{
return static_cast<status_code>(bit_cast<uintptr_t>(payload) >> 1);
}
constexpr bool is_inline() const
{
return m_payload == nullptr || (bit_cast<uintptr_t>(m_payload) & 1) != 0;
}
constexpr status_code code_inline() const
{
ASL_ASSERT(is_inline());
if (m_payload == nullptr)
{
return status_code::ok;
}
return payload_to_status(m_payload);
}
status_code code_internal() const;
string_view message_internal() const;
void ref();
void unref();
public:
constexpr status() = default;
constexpr ~status()
{
if (!is_inline()) { unref(); }
}
explicit constexpr status(status_code code)
: m_payload{status_to_payload(code)}
{}
status(status_code code, string_view msg);
constexpr status(const status& other)
: m_payload{other.m_payload}
{
if (!is_inline()) { ref(); }
}
constexpr status(status&& other)
: m_payload{exchange(other.m_payload, nullptr)}
{}
constexpr status& operator=(const status& other)
{
if (&other != this)
{
if (!is_inline()) { unref(); }
m_payload = other.m_payload;
if (!is_inline()) { ref(); }
}
return *this;
}
constexpr status& operator=(status&& other)
{
if (&other != this)
{
swap(m_payload, other.m_payload);
}
return *this;
}
constexpr bool ok() const
{
return m_payload == nullptr || code() == status_code::ok;
}
// NOLINTNEXTLINE(*-explicit-conversions)
constexpr operator bool() const { return ok(); }
constexpr status_code code() const
{
return is_inline() ? code_inline() : code_internal();
}
constexpr string_view message() const
{
if (!is_inline())
{
return message_internal();
}
return {};
}
};
} // namespace asl
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