basic_ifstream::basic_ifstream
'basic_ifstream' 형식의 개체를 생성합니다.
basic_ifstream( );
explicit basic_ifstream(
const char *_Filename,
ios_base::openmode _Mode = ios_base::in,
int _Prot = (int)ios_base::_Openprot
);
explicit basic_ifstream(
const wchar_t *_Filename,
ios_base::openmode _Mode = ios_base::in,
int _Prot = (int)ios_base::_Openprot
);
basic_ifstream(basic_ifstream&& right);
매개 변수
_Filename
The name of the file to open._Mode
One of the enumerations in ios_base::openmode._Prot
The default file opening protection, equivalent to the shflag parameter in _fsopen, _wfsopen.
설명
The first constructor initializes the base class by calling basic_istream(sb), where sb is the stored object of class basic_filebuf<Elem, Tr>. It also initializes sb by calling basic_filebuf<Elem, Tr>.
The second and third constructors initializes the base class by calling basic_istream(sb). It also initializes sb by calling basic_filebuf<Elem, Tr>, then sb.open(_Filename, _Mode | ios_base::in). If the latter function returns a null pointer, the constructor calls setstate(failbit).
The fourth constructor initializes the object with the contents of right, treated as an rvalue reference.
예제
The following example shows how to read in text from a file. To create the file, see the example for basic_ofstream::basic_ofstream.
// basic_ifstream_ctor.cpp
// compile with: /EHsc
#include <fstream>
#include <iostream>
using namespace std;
int main(int argc, char **argv)
{
ifstream ifs("basic_ifstream_ctor.txt");
if (!ifs.bad())
{
// Dump the contents of the file to cout.
cout << ifs.rdbuf();
ifs.close();
}
}
Input: basic_ifstream_ctor.txt
This is the contents of basic_ifstream_ctor.txt.
Output
This is the contents of basic_ifstream_ctor.txt.
요구 사항
Header: <fstream>
네임스페이스: std