From cbfd8f83de91cb0aa1a99cee4dfb7dcc511f8c21 Mon Sep 17 00:00:00 2001
From: lisyarus <lisyarus@gmail.com>
Date: Tue, 17 May 2022 18:22:17 +0300
Subject: [PATCH] Add util::key_error for use in key-value containers in place
 of std::out_of_range

---
 libs/util/include/psemek/util/key_error.hpp | 29 +++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 libs/util/include/psemek/util/key_error.hpp

diff --git a/libs/util/include/psemek/util/key_error.hpp b/libs/util/include/psemek/util/key_error.hpp
new file mode 100644
index 00000000..ee8dbd2d
--- /dev/null
+++ b/libs/util/include/psemek/util/key_error.hpp
@@ -0,0 +1,29 @@
+#pragma once
+
+#include <psemek/util/to_string.hpp>
+#include <psemek/util/type_name.hpp>
+
+#include <stdexcept>
+
+namespace psemek::util
+{
+
+	template <typename Key>
+	struct key_error
+		: std::out_of_range
+	{
+		key_error(Key const & key)
+			: std::out_of_range(to_string("unknown key ", key, " of type ", type_name<Key>()))
+			, key_(key)
+		{}
+
+		Key const & key() const noexcept
+		{
+			return key_;
+		}
+
+	private:
+		Key key_;
+	};
+
+}