Name
basic_ifstream class template — Class template for file input streams
Synopsis
template <class charT, class traits = char_traits<charT> > class basic_ifstream : public basic_istream<charT,traits> { public: typedef charT char_type; typedef typename traits::int_type int_type; typedef typename traits::pos_type pos_type; typedef typename traits::off_type off_type; typedef traits traits_type; basic_ifstream( ); explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in); basic_filebuf<charT,traits>* rdbuf( ) const; bool is_open( ); void open(const char* s, ios_base::openmode mode = ios_base::in); void open(const char* s, ios_base::open_mode mode); void close( ); };
The basic_ifstream
class
template supports reading from named files using a basic_filebuf<charT
, traits>
object. (See <istream>
for a description of the
base-class template, basic_istream
.) In the following member
function descriptions, the file buffer object is assumed to be a
private data member with the name
buf
:
-
basic_ifstream
( )
Initializes the base class with
basic_istream(&
buf
)
and initializesbuf
with its default constructor.explicit
basic_ifstream
(const
char*
filename, ios_base::openmode
mode
=
ios_base::in)
Initializes the base class and
buf
, then callsopen(filename
,mode)
. Ifopen
returns a null pointer, the constructor callssetstate(failbit)
.basic_filebuf<charT
,traits>*
rdbuf
( )
const
Returns
&
buf
.bool
is_open
( )
Returns
rdbuf( )->is_open( )
.void
open
(const
char*
filename, ...
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