#include <memory>
#include <string>

class SendableMsg {
public:
	using Ptr = std::shared_ptr<SendableMsg>;

	virtual ~SendableMsg() = default;

	virtual const void *data() = 0;
	virtual size_t size() = 0;
};

class StringSendMsg : public SendableMsg {
public:
	explicit StringSendMsg(const char *buffer, size_t len) :
			mMsg(buffer, len) {}

	explicit StringSendMsg(const std::string &buffer) :
			mMsg(buffer) {}

	explicit StringSendMsg(std::string &&buffer) :
			mMsg(std::move(buffer)) {}

	const void *data() override {
		return static_cast<const void *>(mMsg.data());
	}
	size_t size() override {
		return mMsg.size();
	}

private:
	std::string mMsg;
};

static SendableMsg::Ptr MakeStringMsg(const char *buffer, size_t len) {
	return std::make_shared<StringSendMsg>(buffer, len);
}

static SendableMsg::Ptr MakeStringMsg(const std::string &buffer) {
	return std::make_shared<StringSendMsg>(buffer);
}

static SendableMsg::Ptr MakeStringMsg(std::string &&buffer) {
	return std::make_shared<StringSendMsg>(std::move(buffer));
}