1 files changed, 41 insertions, 0 deletions
diff --git a/src/util/optstr.h b/src/util/optstr.h
new file mode 100644
index 0000000..f8a0b4c
--- /dev/null
+++ b/src/util/optstr.h
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+#ifndef INKSCAPE_UTIL_OPTSTR_H
+#define INKSCAPE_UTIL_OPTSTR_H
+/*
+ * Author: PBS <pbs3141@gmail.com>
+ * Copyright (C) 2022 Authors
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include <string>
+#include <optional>
+
+namespace Inkscape {
+namespace Util {
+
+inline bool equal(std::optional<std::string> const &a, char const *b)
+{
+    return a && b ? *a == b : !a && !b;
+}
+
+inline auto to_opt(char const *s)
+{
+    return s ? std::make_optional<std::string>(s) : std::nullopt;
+}
+
+inline auto to_cstr(std::optional<std::string> const &s)
+{
+    return s ? s->c_str() : nullptr;
+}
+
+inline bool assign(std::optional<std::string> &a, char const *b)
+{
+    if (equal(a, b)) return false;
+    a = to_opt(b);
+    return true;
+}
+
+} // namespace Util
+} // namespace Inkscape
+
+#endif // INKSCAPE_UTIL_OPTSTR_H