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  • Problem

    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);

    Resolving The Problem

    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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