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The following construct compiles when fstream.h header file is included; however fails with the new
header file:
#include
using namespace std;
int main() {
ifstream infile("input.dat", ios::in, filebuf::openprot);
The above ifstream constructor prototype is of the old non-ISO specification and it is not supported in the new ISO C++ Standard library:
ifstream(const char *name,
int mode=ios::in,
int prot=filebuf::openprot)
Section 27.8.1.5 of the ISO C++ Standard defines ifstream as a typedef of std::basic_ifstream<char>, which has the following specification:
template <class charT, class traits = char_traits<charT> >
class basic_ifstream {
explicit basic_ifstream(const char *s,
ios_base::openmode mode = ios_base::in);
Therefore, the three-parameter prototype is available only in the old fstream header file (fstream.h). To make the construct compile, remove the third parameter. For example,
#include <fstream>
using namespace std;
int main() {
ifstream infile("input.dat", ios::in);
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