C + + Why Ifstream do not use new, run out of delete

Just starting from C # to C + +, there are a lot of things that don't understand, like this code below:

#include <fstream>
#include <iostream>

int main () {
using namespace Std;
Ifstream file;
Basic_ifstream <wchar_t> Wfile;
char c;
Open and close with a basic_filebuf
File.rdbuf ()->open ("Basic_filebuf_close.txt", ios::in);
File >> C;
cout << c << Endl;
File.rdbuf ()->close ();

Open/close directly
File.Open ("Iotest.txt");
File >> C;
cout << c << Endl;
File.close ();

Open a file with a wide character name
Wfile.open (L "Iotest.txt");

Open and close a nonexistent with a basic_filebuf
File.rdbuf ()->open ("Ziotest.txt", ios::in);
cout << file.fail () << Endl;
File.rdbuf ()->close ();

Open/close directly
File.Open ("Ziotest.txt");
cout << file.fail () << Endl;
File.close ();
}

Below is my chat record with Daniel, the question untie. (There is a Daniel to help answer the question feeling is cool ah!) ）

Skyline Wolf 2014/8/11 9:35:42Have 2 questions
Ifstream file;
File.Open ("Iotest.txt");
File.close ();
1. Can I call the file method without new?
2. When you're done, call File.close () and end up without delete.

Daniel 2014/8/11 9:33:55
Think about it yourself. What does new do?

Skyline Wolf 2014/8/11 9:35:42
New is used to create objects that allocate memory space on the heap. You mean this ifstream is a template, so you don't have to?
9:36:22
Daniel 2014/8/11 9:36:22
The understanding of new is right. This object is declared on the stack.

Skyline Wolf 2014/8/11 9:38:19
What you're saying is that if an object is just a reputation in front of you, then this famous variable is allocated on the stack. If you have a reputation, use new to allocate it on the heap. Is that so?
9:38:40
Daniel 2014/8/11 9:38:40
Yes

Daniel 2014/8/11 9:39:09
The object on the stack is not delete.

Skyline Wolf 2014/8/11 9:39:15
Well, the second question is clear. The first question is still a mystery,

Skyline Wolf 2014/8/11 9:39:37
Objects on the stack don't have to delete I know that.

Skyline Wolf 2014/8/11 9:40:16
Oh, isn't C + + using the default constructor?

Skyline Wolf 2014/8/11 9:40:38
The object was initialized before the call
9:41:46
Daniel 2014/8/11 9:41:46
Yes
You set a breakpoint in the constructor to see

Skyline Wolf 2014/8/11 9:43:01
3Q, clear. Well, this debugging method is very good.