#include<iostream>#include<new>using namespace std;class DebugDelete{public:    DebugDelete(ostream &s=cerr):os(s) {}    template <typename T>    void operator()(T *p) const    {        os<<"deleting unique_ptr "<<endl;        delete p;    }private:    ostream &os;};int main(){    double *p=new double;    DebugDelete d;    d(p);    int *ip=new int;    DebugDelete()(ip);    return 0;}

#ifndef TEXTQUERY_H#define TEXTQUERY_H#include<iostream>#include<string>#include<fstream>#include<vector>#include<memory>#include<map>#include<set>#include<new>#include"DebugDelete.h"using namespace std;class QueryResult;class TextQuery{public:    using line_no=vector<string>::size_type;    TextQuery(ifstream&);    QueryResult query(const string&) const;    ~TextQuery()    {        //DebugDelete()(new vector<string>);        cout<<"destructing...."<<endl;    }private:    shared_ptr<vector<string>> file;    map<string,shared_ptr<set<line_no>>> wm;};#endif // TEXTQUERY_H

#include"TextQuery.h"#include"QueryResult.h"#include<sstream>TextQuery::TextQuery(ifstream& is):file(new vector<string>,DebugDelete()){    string text;    while(getline(is,text))    {        file->push_back(text);        int n=file->size()-1;        string word;        istringstream line(text);        while(line>>word)        {            auto &lines=wm[word];            if(!lines)                lines.reset(new set<line_no>);            lines->insert(n);        }    }}QueryResult TextQuery::query(const string& sought) const{    static shared_ptr<set<line_no>> nodata(new set<line_no>);    auto loc=wm.find(sought);    if(loc!=wm.end())        return QueryResult(sought,loc->second,file);    else        return QueryResult(sought,nodata,file);}

#include<iostream>#include<new>using namespace std;class DebugDelete{public:    DebugDelete(ostream &s=cerr):os(s) {}    template <typename T>    void operator()(T *p) const    {        os<<"deleting shared_ptr "<<endl;        delete p;    }private:    ostream &os;};