basic_ifstream Constructor

Creates a file stream for input.

  basic_ifstream();
  explicit basic_ifstream
     (const char *s, ios_base::openmode mode = ios_base::in);

Remarks

The constructor creates a stream for file input. It is overloaded to either create and initialize when called or to simply create a class and be opened using the open() member function. The default opening mode is ios::in. See basic_filebuf::open() for valid open mode settings.

See basic_ifstream::open for legal opening modes.

See Also

basic_ifstream::open() for overloaded form usage.

Listing: Example of basic_ifstream::basic_ifstream() constructor usage:

// The ewl-test file contains:
// CodeWarrior "Software at Work"

#include <iostream>
#include <fstream>
#include <cstdlib>

char inFile[] = "ewl-test";

int main()
{
using namespace std;
   ifstream in(inFile, ios::in);

      if(!in.is_open()) 
         {cout << "can't open input file"; exit(1);}

   char c ='\0';
   while(in.good())
   {
      if(c) cout << c;
      in.get(c);
   }

   in.close();
   return 0;
}

Result:

  CodeWarrior "Software at Work"