c++ primer 第五版 StrBlob类(p404)

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Strblob.h

#include <vector>#include <string>#include <memory>class StrBlob{public:    typedef std::vector<std::string>::size_type size_type;    StrBlob();    StrBlob(std::initializer_list<std::string> il);    size_type size() const {return data->size();}    bool empty() const {return data->empty();};    void push_back(const std::string& t) { data->push_back(t);};    void pop_back();    std::string& front();    std::string& back();private:    std::shared_ptr<std::vector<std::string>> data;    void check(size_type i, const std::string &msg) const;};

StrBlob.cpp

#include "StrBlob.h"#include <exception>StrBlob::StrBlob():data(std::make_shared<std::vector<std::string>>()){}StrBlob::StrBlob(std::initializer_list<std::string> il):    data(std::make_shared<std::vector<std::string>>(il)){}void StrBlob::check(size_type i, const std::string &msg) const{    if(i >= data->size())        throw std::out_of_range(msg);}std::string& StrBlob::front(){    check(0, "front on empty StrBlob");    return data->front();}std::string& StrBlob::back(){    check(0, "back on empty StrBlob");    return data->back();}void StrBlob::pop_back(){    check(0, "pop_back on empty StrBlob");    return data->pop_back();}

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