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-rw-r--r--lib/msgException.h23
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/msgException.h b/lib/msgException.h
new file mode 100644
index 0000000..660738d
--- /dev/null
+++ b/lib/msgException.h
@@ -0,0 +1,23 @@
+#pragma once
+
+#include <optional>
+#include <string>
+
+template<typename BaseException> class MsgException : public BaseException {
+protected:
+ using BaseException::BaseException;
+ [[nodiscard]] virtual std::string getMsg() const noexcept = 0;
+
+public:
+ [[nodiscard]] const char *
+ what() const noexcept override
+ {
+ if (!msg) {
+ msg.emplace(getMsg());
+ }
+ return msg->c_str();
+ }
+
+private:
+ mutable std::optional<std::string> msg;
+};