【C++ Primer | 12】动态内存与智能指针

#ifndef MY_STRBLOB_H
#define MY_STRBLOB_H
#include<iostream>
#include<vector>
#include<memory>
#include<initializer_list>
using namespace std;

class StrBlob
{
public:
	typedef vector<string>::size_type size_type;
	StrBlob();
	StrBlob(initializer_list<string> il);

	size_type size() const { return data->size(); }
	bool empty()const { return data->empty(); }
	void push_back(const string &t) { data->push_back(t); }
	void pop_back();
	string& front();
	string back();
private:
	shared_ptr<vector<string>> data;
	void check(size_type i, const string &msg) const;
};

StrBlob::StrBlob(): data(make_shared<vector<string>>()) {}

StrBlob::StrBlob(initializer_list<string> il): data(make_shared<vector<string>>(il)) {}

void StrBlob::check(size_type i, const string &msg) const
{
	if (i >= data->size())
		throw out_of_range();

}
void StrBlob::pop_back()
{
	check(0, "pop_back on empty StrBlob");
	data->pop_back();
}

string& StrBlob::front()
{
	check(0, "front on empty StrBlob");
	return data->front();
}

string& StrBlob::back()
{
	check(0, "back on empty StrBlob")；
		return data->back();
}
#endif