Re: compile error about auto_ptr
On Feb 23, 7:11 pm, George <Geo...@discussions.microsoft.com> wrote:
I am confused to read what the compiler says. Could anyone explain what it=
means?
[Code]
#include <memory>
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main( )
{
int i = 0;
vector<auto_ptr<int>> vc;
for (i = 0; i < 5; i ++) // 0 1 2 3 4
{
auto_ptr<int> pi (new int(i));
vc.push_back (pi);
}
return 0;}
[/Code]
1>Compiling...
1>main.cpp
1>d:\program files\microsoft visual studio 9.0\vc\include\vector(1209) :
error C2558: class 'std::auto_ptr<_Ty>' : no copy constructor available or=
copy constructor is declared 'explicit'
1> with
1> [
1> _Ty=int
1> ]
1> d:\program files\microsoft visual studio
9.0\vc\include\vector(1158) : while compiling class template member functi=
on
'void
std::vector<_Ty>::_Insert_n(std::_Vector_const_iterator<_Ty,_Alloc>,unsign=
e=ADd
int,const _Ty &)'
1> with
1> [
1> _Ty=std::auto_ptr<int>,
1> _Alloc=std::allocator<std::auto_ptr<int>>
1> ]
1> d:\visual studio
2008\projects\test_autoptr1\test_autoptr1\main.cpp(11) : see reference to
class template instantiation 'std::vector<_Ty>' being compiled
1> with
1> [
1> _Ty=std::auto_ptr<int>
1> ]
1>d:\program files\microsoft visual studio 9.0\vc\include\vector(1233) :
error C2558: class 'std::auto_ptr<_Ty>' : no copy constructor available or=
copy constructor is declared 'explicit'
1> with
1> [
1> _Ty=int
1> ]
What are you confused about? The compiler error says that there is a
problem related to copy constructor of auto_ptr. See <memory> header
for your compiler (code for auto_ptr should be there) about how the
copy constructor is written and why it is a problem with your code.
Basically, you cannot use auto_ptr with standard containers. See this
for more details : http://www.gotw.ca/publications/using_auto_ptr_effectivel=
y.htm