spdlog/include/c11log/log_exception.h

#pragma once
#include <sstream>
#include <iostream>

namespace c11log
{
	class log_exception :public std::exception
	{
	public:
		log_exception() : _oss(), _msg()
		{}

		virtual ~log_exception()
		{}

		explicit log_exception(const std::string& msg) :_oss(msg, std::ostringstream::ate), _msg(msg)
		{}

		log_exception(const log_exception &other) :_oss(other._oss.str()), _msg(other._msg)
		{}

		log_exception& operator=(const log_exception& other)
		{
			_oss.str(other._oss.str());
			_msg = other._msg;
			return *this;
		}

		virtual const char* what() const throw () override
		{
			return _msg.c_str();
		}

		template<typename T>
		log_exception& operator<<(const T& what)
		{
			_oss << what;
			_msg = _oss.str();
			return *this;
		}

	private:
		std::ostringstream _oss;
		std::string _msg;
	};
}