problem with vector

[vivmen]

Hi all
i am trying following code

class myc
{
	static int i;
public:
	myc()
	{
		cout<<++i<<" ctor \n";
	}
	~myc()
	{
		cout<<--i<<" dtor \n";
	}
};

int myc::i = 0;

int main()
{
	{
		vector<myc> vec(5);
	}
	return 0;
}

output
on vs 2010

1 ctor
0 dtor
1 ctor
0 dtor
1 ctor
0 dtor
1 ctor
0 dtor
1 ctor
0 dtor
-1 dtor
-2 dtor
-3 dtor
-4 dtor
-5 dtor
Press any key to continue . . .

on rhel linux

1 base ctor
0 base dtor
-1 base dtor
-2 base dtor
-3 base dtor
-4 base dtor
-5 base dtor

why distructor went up to -5 , (when i have pointer in my class which get deleted in distructor my code fails.)

i think it should create 5 objects of myc & destroy them at end.

thanks in advance.

[kbw]

You need to add counters to the copy constructor.

[vivmen]

ok here is output after adding copy construcor

1 ctor
2 copy ctor
3 copy ctor
4 copy ctor
5 copy ctor
6 copy ctor
5 dtor
4 dtor
3 dtor
2 dtor
1 dtor
0 dtor

Press any key to continue.

but why copy constructor i think as i am creating 5 objects in vector there should be 5 constructor and 5 distructor

[cire]

http://www.cplusplus.com/reference/stl/vector/vector/

explicit vector ( size_type n, const T& value= T(), const Allocator& = Allocator() );
Repetitive sequence constructor: Initializes the vector with its content set to a repetition, n times, of copies of value.

One temporary constructed and bound to value. 5 copies constructed in the vector.

[ne555]

http://en.cppreference.com/w/cpp/container/vector/vector
explicit vector( size_type count ); //C++11
constructs the container with count value-initialized (default constructed, for classes) instances of T. No copies are made.

[vivmen]

as per statement

explicit vector ( size_type n, const T& value= T(), const Allocator& = Allocator() );
Repetitive sequence constructor: Initializes the vector with its content set to a repetition, n times, of copies of value.

the output of rhel linux is correct construct one object and made 5 copies.

but what about vs 2010 ? i think it use c++ 11

[kbw]

VS Release build will produce a more reasonable log.

[vivmen]

contact microsoft.
well lets see their view.
here is link


http://social.msdn.microsoft.com/Forums/en-US/vclanguage/thread/3c2060af-b747-4d1b-a3d9-be7ddcc4690d/