X-Git-Url: https://git.stg.codes/stg.git/blobdiff_plain/4271ab433cd55bbd2612292bcf39e4dc3d7274f1..0907aa4037b12b6b88ee24495d4577a064d4f8db:/projects/sgconf/utils.h

diff --git a/projects/sgconf/utils.h b/projects/sgconf/utils.h
new file mode 100644
index 00000000..6168cbf2
--- /dev/null
+++ b/projects/sgconf/utils.h
@@ -0,0 +1,45 @@
+#pragma once
+
+#include "stg/common.h"
+#include "stg/optional.h"
+
+#include <string>
+#include <map>
+
+namespace SGCONF
+{
+
+template <typename T>
+inline
+void MaybeSet(const std::map<std::string, std::string> & options, const std::string & name, STG::Optional<T> & res)
+{
+std::map<std::string, std::string>::const_iterator it(options.find(name));
+if (it == options.end())
+    return;
+T value;
+if (str2x(it->second, value) < 0)
+    return;
+res = value;
+}
+
+template <typename T, typename F>
+inline
+void MaybeSet(const std::map<std::string, std::string> & options, const std::string & name, T & res, F conv)
+{
+std::map<std::string, std::string>::const_iterator it(options.find(name));
+if (it == options.end())
+    return;
+conv(it->second, res);
+}
+
+template <>
+inline
+void MaybeSet<std::string>(const std::map<std::string, std::string> & options, const std::string & name, STG::Optional<std::string> & res)
+{
+std::map<std::string, std::string>::const_iterator it(options.find(name));
+if (it == options.end())
+    return;
+res = it->second;
+}
+
+} // namespace SGCONF