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#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;
};
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