先把問題拋上來，如下：

下面是自己開始的第一遍的代碼（錯誤一大堆，沒關系，一個一個解決）

#include <iostream> #include <string> #include <map> #include <set> #include <vector> #include <memory> #include <sstream> #include "resultquery.h" #include "textquery.h" using namespace std;void runQueries(ifstream &infile) {TextQuery tq(infile);while(true){cout << "enter word to look for,or q to quit: ";string s;if(!(cin >> s) || s == "q")break;print(cout,tq.query(s)) << endl;} }TextQuery::TextQuery():lines(new vector<string>()){} TextQuery::TextQuery(ifstream &in){ string line; TextQuery::line_no no = 0;while(in >> line){istringstream i(line);string word;while(i >> word){if(!(li_no[word]))li_no[word].reset(new set<TextQuery::line_no>);elseli_no[word]->insert(no);}++ no;//累加行的值} }ResultQuery TextQuery::query(const string &s){ if(li_no.find(s) != li_no.end()){return ResultQuery(s,li_no[s]);} else{static shared_ptr<set<TextQuery::line_no>> nodata(new set<TextQuery::line_no>);return ResultQuery(s,nodata);} }ResultQuery::ResultQuery() = default; ResultQuery::ResultQuery(const string &s,shared_ptr<vector<string>> l,shared_ptr<set<TextQuery::line_no>> n;):word(s),numbers(n),file(l){}istream &print(istream &is,ResultQuery &rq){cout << rq.word<<" occurs " << file.size() << plural(file.size(),"time","s") << endl;for(auto i : rq.numbers)cout << "(line "<<i + 1 << ")" << file[i] << endl;} #ifndef TEXTQUERY_H #define TEXTQUERY_H#include <iostream> #include <string> #include <map> #include <set> #include <vector> #include <memory> #include <sstream> using namespace std; void runQueries(ifstream &); class ResultQuery; class TextQuery{public:using line_no = vector<string>::size_type line_no;TextQuery();TextQuery();ResultQuery query(const string &s)const;private:shared_ptr<vector<string>> lines;map<string,shared_ptr<set<line_no>>> li_no; }; string make_plural(int i,const string &s,const string & s1) {return (i > 1)?(s + s1):(s); }#endif

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#ifndef RESULTQUERY_H #define RESULTQUERY_H #include <iostream> #include <string> #include <map> #include <set> #include <vector> #include <memory> #include <sstream> using namespace std;class ResultQuery{friend istream &print(istream &,ResultQuery &);public:ResultQuery();ResultQuery(const string &,shared_ptr<vector<string>>,shared_ptr<set<TextQuery::line_no>>);private:string word;shared_ptr<set<TextQuery::line_no>> numbers;shared_ptr<vector<string>> file;};#endif

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#include <iostream> #include <string> #include <map> #include <set> #include <vector> #include <memory> #include <sstream> using namespace std;int main() {return 0; }

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總結

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