[boost] [smart_ptr] shared_ptr<T> T destructor required even if a deleter function is provided

28 Sep 2008

      Hello,

I have compiled the example Preventing delete px.get()and every thing is OK 
until we use the reset function because shared_ptr<X> request that the 
destructor of X must be public even if a deleter function is provided. I'm 
wondering if this is a BUG on the smart pointer library

Next follows the trace:

../../../boost/checked_delete.hpp: In function `void 
boost::checked_delete(T*) [
with T = X]':
../../../boost/detail/shared_count.hpp:91:   instantiated from 
`boost::detail::s
hared_count::shared_count(Y*) [with Y = X]'
../../../boost/shared_ptr.hpp:173:   instantiated from `boost::shared_ptr< 
<temp
late-parameter-1-1> >::shared_ptr(Y*) [with Y = X, T = X]'
../../../boost/shared_ptr.hpp:394:   instantiated from `void 
boost::shared_ptr<
<template-parameter-1-1> >::reset(Y*) [with Y = X, T = X]'
test_shared_ptr.cpp:37:   instantiated from here
test_shared_ptr.cpp:13: error: `X::~X()' is private
../../../boost/checked_delete.hpp:34: error: within this context

And here it is the source code

#include <boost/shared_ptr.hpp>
using namespace boost;
class X {
private:
    ~X(){};
    class deleter;
    friend class deleter;
    class deleter  {
    public:
        void operator()(X * p) { delete p; }
    };
public:
    static shared_ptr<X> create()   {
        shared_ptr<X> px(new X, X::deleter());
        return px;
    }
};

int main () {
    shared_ptr<X> ptr = X::create();
    ptr.reset(X::create().get());
    return 0;
}

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Vicente Juan Botet Escribá

[boost] [smart_ptr] shared_ptr<T> T destructor required even if a deleter function is provided

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