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Re: auto_ptr gcc version 3.3.1 (cygming special) problem
- From: Rolf Campbell <Endlisnis at mailc dot net>
- To: cygwin at cygwin dot com
- Date: Wed, 07 Jan 2004 23:20:09 -0500
- Subject: Re: auto_ptr gcc version 3.3.1 (cygming special) problem
- References: <3FFCD90C.6000905@terra.com.br>
#1) This is not a cygwin issue, so it's off-topic here.
#2) This is not even really a gcc issue, it's a C++ issue.
#3) The problem is that you are trying to use static_cast too much. It
should only be used for built-in types (int, float, various pointers).
The older gcc seemed to allow incorrect use of static_cast, the new one
requires you to use it right.
Just remove the static casts, and away we are:
int main(int argc, char *argv[])
{
A a(1);
auto_ptr<B> b = auto_ptr<B>(a.getB());
A a2(2);
auto_ptr<B> b2 = auto_ptr<B>(a2.getB());
cin.get();
return 0;
}
Or even:
int main(int argc, char *argv[])
{
A a(1);
auto_ptr<B> b(a.getB());
A a2(2);
auto_ptr<B> b2(a2.getB());
cin.get();
return 0;
}
Marcelo Rezende Módolo wrote:
Hi,
I am not shure that this is a error , but it is very strange...
//autoPtr.cpp
#include <iostream>
#include <memory>
using namespace std;
class B {
public:
B(int cid) : cid_(cid) { cout << "B(" << cid_ << ")\n"; }
~B() { cout << "~B(" << cid_ << ")\n"; }
private:
int cid_; };
class A {
public:
A(int cid) : cid_(cid) { cout << "A(" << cid_ << ")\n"; }
~A() { cout << "~A(" << cid_ << ")\n"; } B* getB() { return new
B(cid_); }
private:
int cid_; };
int main(int argc, char *argv[])
{
A a(1);
auto_ptr<B> b = static_cast< auto_ptr<B> >(a.getB());
A a2(2);
auto_ptr<B> b2 = static_cast< auto_ptr<B> >(a2.getB());
cin.get();
return 0;
}
If I compile this file with gcc version 3.2.3 (mingw special 20030504-1)
no errors ocur (g++ -o autoPtr autoPtr.cpp).
But if I try to compile using gcc version 3.3.1 (cygming special), with
the same command line (g++ -o autoPtr autoPtr.cpp),
this errors ocur:
autoPtr.cpp: In function `int main(int, char**)':
autoPtr.cpp:26: error: invalid static_cast from type `B*' to type `
std::auto_ptr<B>'
autoPtr.cpp:29: error: invalid static_cast from type `B*' to type `
std::auto_ptr<B>'
what is the problem??
thanks,
marcelo
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