hresult_error_intf.hpp

// Copyright Take Vos 2024.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "../macros.hpp"
#include "win32_error_intf.hpp"
#include <Windows.h>
#include <errhandlingapi.h>
#include <system_error>
 
hi_export_module(hikogui.win32 : win32_error_intf);
 
hi_export namespace hi { inline namespace v1 {
 
enum class hresult_error : int32_t {
    ok = S_OK,
    unspecified_error = E_FAIL,
    invalid_argument = E_INVALIDARG,
};
 
}} // namespace hi::v1
 
hi_export template<>
struct std::is_error_code_enum<hi::hresult_error> : std::true_type {};
 
hi_export namespace hi { inline namespace v1 {
 
struct hresult_error_category : std::error_category {
    char const *name() const noexcept override
    {
        return "hresult";
    }
 
    std::string message(int code) const override;
 
    bool equivalent(int code, std::error_condition const & condition) const noexcept override
    {
        switch (static_cast<hi::hresult_error>(code)) {
        case hi::hresult_error::invalid_argument:
            return condition == std::errc::invalid_argument;
        default:
            return false;
        };
    }
};
 
inline auto global_hresult_error_category = hresult_error_category{};
 
[[nodiscard]] inline std::error_code make_error_code(hresult_error code) noexcept
{
    return {static_cast<int>(code), global_hresult_error_category};
}
 
[[nodiscard]] inline hresult_error to_win32_error(win32_error code) noexcept
{
    return static_cast<hresult_error>(__HRESULT_FROM_WIN32(static_cast<DWORD>(code)));
}
 
}}