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From: "ethouris at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/104343] New: Too many arguments error reported for a
 variadic-argument function if std::endl is passed
Date: Wed, 02 Feb 2022 13:19:12 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104343

            Bug ID: 104343
           Summary: Too many arguments error reported for a
                    variadic-argument function if std::endl is passed
           Product: gcc
           Version: 7.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ethouris at gmail dot com
  Target Milestone: ---

I have the following definition (requires `<string>` and `<stringstream>`):

```
template <class Stream>
inline Stream& Print(Stream& in) { return in;}

template <class Stream, class Arg1, class... Args>
inline Stream& Print(Stream& sout, Arg1&& arg1, Args&&... args)
{
    sout << arg1;
    return Print(sout, args...);
}

template <class... Args>
inline std::string Sprint(Args&&... args)
{
    std::ostringstream sout;
    Print(sout, args...);
    return sout.str();
}
```

The call

```
sinfo.bufferinfo =3D Sprint("B: off=3D", buffer.offset(), " now=3D",
FormatTime(timeinfo), endl);
```

Reports this error:

```
(5 of 13): error: too many arguments to function 'std::__cxx11::string
Sprint(Args&& ...) [with Args =3D {}; std::__cxx11::string =3D
std::__cxx11::basic_string<char>]'
```

Replacing `endl` with `"\n"` fixes the problem.

Might be that I cannot bind `std::endl` to the argument as given here, but =
the
error report is at least misleading. How can there be "too many arguments"
passed to a function that gets a variable number of arguments?=