Describes an object that controls extraction of elements and encoded objects from a stream buffer of class basic_filebuf<Elem, Tr>, with elements of type Elem, whose character traits are determined by the class Tr.
For a list of all members of this type, see basic_ifstream Members.
template <class Elem, class Tr = char_traits<Elem> >
class basic_ifstream : public basic_istream<Elem, Tr>
Parameters
Elem
The basic element of the file buffer.Tr
The traits of the basic element of the file buffer (usually char_traits<Elem>).
Remarks
The object stores an object of class basic_filebuf<Elem, Tr>.
Example
The following example shows how to read in text from a file.
// basic_ifstream_class.cpp
// compile with: /EHsc
#include <fstream>
#include <iostream>
using namespace std;
int main(int argc, char **argv)
{
ifstream ifs("basic_ifstream_class.txt");
if (!ifs.bad())
{
// Dump the contents of the file to cout.
cout << ifs.rdbuf();
ifs.close();
}
}
Input: basic_ifstream_class.txt
This is the contents of basic_ifstream_class.txt.
Output
This is the contents of basic_ifstream_class.txt.
Requirements
Header: <fstream>
Namespace: std
See Also
Reference
Thread Safety in the Standard C++ Library