add error-handling functions

They are almost exact copies from my pdb-repo project at
https://github.com/egor-tensin/pdb-repo/tree/fa2afec5e7af45e7f1440b2d32c2a4e63dad6a62

I'm currently thinking about renaming it to winapi-debug BTW.

1 files changed, 35 insertions, 0 deletions

diff --git a/include/winapi/error.hpp b/include/winapi/error.hpp
new file mode 100644
index 0000000..4b3f1e0
--- /dev/null
+++ b/include/winapi/error.hpp
@@ -0,0 +1,35 @@
+// Copyright (c) 2020 Egor Tensin <Egor.Tensin@gmail.com>
+// This file is part of the "winapi-common" project.
+// For details, see https://github.com/egor-tensin/winapi-common.
+// Distributed under the MIT License.
+
+#pragma once
+
+#include <boost/config.hpp>
+
+#include <windows.h>
+
+#include <string>
+#include <system_error>
+
+namespace winapi {
+namespace error {
+
+class CategoryWindows : public std::error_category {
+public:
+    CategoryWindows() = default;
+
+    const char* name() const BOOST_NOEXCEPT_OR_NOTHROW { return "Windows"; }
+
+    std::string message(int) const;
+};
+
+inline const CategoryWindows& category_windows() {
+    static const CategoryWindows instance;
+    return instance;
+}
+
+std::system_error windows(DWORD code, const char* function);
+
+} // namespace error
+} // namespace winapi