Re: [Boost-users] Suggestion for boost`s smart pointers

Sohail Somani wrote:

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-----Original Message----- From: boost-users-bounces@lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of mark cox Sent: Tuesday, November 28, 2006 2:37 PM To: boost-users@lists.boost.org Subject: Re: [Boost-users] Suggestion for boost`s smart pointers

wow, this seems like a great idea, a scoped_ptr with deleter would be v.useful. mark

I've been thinking something like (just something I hacked together just now). Not sure if there is a nicer way.

#include <string> #include <cstdio> #include <iostream>

template<typename T> struct DeletingDeleter { DeletingDeleter(T * p) { delete p; std::cout << "DeletingDeleter" << std::endl; } };

struct FileCloser { FileCloser(FILE * f) { std::cout << "Closing file" << std::endl; fclose(f); } };

template struct scoped_ptr { scoped_ptr():p_(0){} scoped_ptr(T * p):p_(p){} ~scoped_ptr() { Deleter d(p_); } T * get() {return p_;} // regular stuff private: T * p_; };

typedef scoped_ptr file_ptr;

int main() { scoped_ptr<int> a; // maintain old interface scoped_ptr<int> b(new int(5)); file_ptr p(fopen("myfile.txt","w")); fprintf(p.get(),"Hello world!\n"); } sorry for such late response, i think you should also consider Andrei and Petru's ScopeGuard from http://www.ddj.com/dept/cpp/184403758