Re: implementations of new

From:

"Le Chaud Lapin" <jaibuduvin@gmail.com>

Newsgroups:

comp.lang.c++.moderated

Date:

Wed, 4 Apr 2007 12:58:17 CST

Message-ID:

<1175703556.988165.304040@w1g2000hsg.googlegroups.com>

On Apr 4, 11:50 am, "Lance Diduck" <lancedid...@nyc.rr.com> wrote:

On Apr 4, 5:58 am, "Ivan Novick" <ivan.d.nov...@gmail.com> wrote:> Hi,

Since there is a thread running concurrently about the implications of
virtual destructors, I thought I would point out that the code below
requires that the destructor of the base object be virtual. If the
destructor is not virtual, there will be a run-time error when delete
expression is invoked against at pointer whose static type is the base
type but dynamic type is the derived type.

template<class T>
void ::pseudo_delete(T*_p){
    MostDerivedType * mdt=mostderived_cast<MostDerivedType>(_p);
    mdt->~MostDerivedType();
    if(overloaded_delete_operator<MostDerivedType>::value)
       overloaded_delete_operator<MostDerivedType>::Scope::delete(_p);
    else
       // mdt is "leftmost" pointer
     ::operator delete(mdt);

}

-Le Chaud Lapin-

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