CODEWITHSUNDEEP
c++iostl
Tyrel Van Niekerk
Tyrel Van Niekerk

Reputation: 1712

C++ operator << calling ::ostream instead of std::ostream

I have searched high and low, but have not found an answer, so please excuse if this is a duplicate.

I have some very old C++ code that I am trying to lightly convert into this millennium. The code still compiles in Visual Studio 6 and needs to continue doing so, but I am also trying to get it working in Visual Studio 2017. I have done this before, but with many changes to the header files etc., this time I am trying a more measured approach.

The code already uses a mix of stl and non-stl, old and new io headers etc., so it's a mess waiting to explode.

As a simple start, I just replaced iostream.h with iostream to see what would happen. I got some compiler errors where the code had ::ostream in it, so changing that to std::ostream fixed that issue. Next I get an issue with an overloaded << operator, all of the bits in there are using std::iostream, but it seems that the << commands are trying to use ostream instead (or basic_ostream).

What am I missing? I assume I have to change out some more header files that are importing the old io classes.

inline std::ostream& operator<<(std::ostream& os, const PrinterInfo& pi)
{
    os << pi.Idx() << ": " << pi.Name() << ", "
            << PrinterInfo::MapPrinterType(pi.GetPrinterType()) << ", "
            << PrinterInfo::MapPaperType(pi.GetPaperType()) << ", "
            << PrinterInfo::MapPrintFormat(pi.GetPrintFormat()) << ", "
            << PrinterInfo::MapRasType(pi.GetRasType()) << ", "
            << PrinterInfo::MapNPS(pi.NPS()) << ", "
            << "dpx = " << pi.Duplex() << ", "
            << "tray = " << pi.Tray2() << ", "
            << "port = " << pi.PortNo();

    return os;
}

The PrinterInfo class has an override for the << operator as well:

    inline std::ostream& operator<<(std::ostream& os, const PrinterOption& po)
{
    os << "(" << po.Installed() << ", " << po.Enabled() << ")";
    return os;
}

Upvotes: 1

Views: 410

Answers (1)

Christos Karamoustos
Christos Karamoustos

Reputation: 97

I dont know if that is the case but if you implement the body of a function INSIDE the class header file remove the inline keyword, i had a similar problem and i waste 2-3 whole days and a lot of recoding to realise this...

Upvotes: 1

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