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// Copyright (c) 2020 Egor Tensin <egor@tensin.name>
// This file is part of the "winapi-common" project.
// For details, see https://github.com/egor-tensin/winapi-common
// Distributed under the MIT License.
/**
* @file
* @brief Make `std::system_error` work with `GetLastError()`.
*/
#pragma once
#include <windows.h>
#include <cstdint>
#include <format>
#include <stdexcept>
#include <string>
#include <system_error>
namespace winapi::error {
class CategoryWindows : public std::error_category {
public:
CategoryWindows() = default;
const char* name() const noexcept {
return "Windows";
}
std::string message(int32_t) const;
};
inline const CategoryWindows& category_windows() {
static const CategoryWindows instance;
return instance;
}
/**
* Build a `std::system_error` from the value of `GetLastError()`.
* @param code Value of `GetLastError()`.
* @param function Name of the function that failed, like "CreateFile".
*/
std::system_error windows(DWORD code, const char* function);
template <typename Ret>
std::runtime_error custom(Ret ret, const char* function) {
return std::runtime_error{std::format("Function {} failed with error code {}", function, ret)};
}
} // namespace winapi::error
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