From: Ilya Sokolov (fal_delivery_at_[hidden])
Date: 2006-11-30 12:16:00
Sohail Somani wrote:
>>-----Original Message-----
>>From: boost-users-bounces_at_[hidden]
>>[mailto:boost-users-bounces_at_[hidden]] On Behalf Of mark cox
>>Sent: Tuesday, November 28, 2006 2:37 PM
>>To: boost-users_at_[hidden]
>>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<typename T, typename Deleter=DeletingDeleter<T> >
> 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,FileCloser> 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