Re: How to redirect clog to cout and ofstream at the same time?

From:

ksamdev <ksamdev@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Fri, 10 Sep 2010 07:12:57 -0700 (PDT)

Message-ID:

<90e199b3-93cc-4242-99d9-8ca2d759ecd9@k30g2000vbn.googlegroups.com>

On Sep 10, 8:24 am, "Francesco S. Carta" <entul...@gmail.com> wrote:

ksamdev <ksam...@gmail.com>, on 10/09/2010 06:15:50, wrote:

Hi,

Is is possible to make clog output messages into two output stream
simultaneously, say: cout and ostream?

Unfortunately, ostream::rdbuf(...) allows to set only one at a time.

I'd like to have messages that are sent to clog to be output on the
screen and logged in file at the same time.

Consider creating a stream-like "mylog" class and set it to output the
data to whatever you like, whenever you insert data into it. Obviously,
you should replace all occurrences of "clog" with "mylog", then.

--
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Hmm, are you suggesting something like [*] ?

[*]

class MyLog
{
  public:
     MyLog();

     template<typename T>
       MyLog &operator <<(const T &)
};

....

template<typename T>
MyLog &MyLog::operator<<(const T &)
{
  clog << T;
  cout << T;

  return *this;
}

Honestly, I am not quite sure if it will work with <iomanip> since I
use those a lot. My guess would be: it won't work out of the box.