Name
ifstream class — Input file stream
Synopsis
typedef basic_ifstream<char> ifstream;
The ifstream
class is a
specialization of the basic_ifstream
template for char
characters. Example 13-9 shows a simple use
of the ifstream
and ofstream
classes.
Example
#include <cstdlib> #include <fstream> #include <cstdio> // For perror( ) #include <iostream> // For cerr int main(int argc, char** argv) { if (argc != 3) { std::cerr << "usage: copy FROM TO\n"; return EXIT_FAILURE; } // Open the input file. std::ifstream in(argv[1]); if (! in) { std::perror(argv[1]); return EXIT_FAILURE; } // Open the output file. std::ofstream out(argv[2]); if (! out) { std::perror(argv[2]); return EXIT_FAILURE; } // Copy the input to the output, one character at a time. char c; while (in.get(c)) out.put(c); out.close( ); // Make sure the output was written. if (! out) { std::perror(argv[2]); return EXIT_FAILURE; } }
See Also
basic_ifstream class
template, wifstream
class, istream
in <istream>
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