Re: [boost] [iostreams]ANNOUNCE:indent_filtering_ostream.zip in vault

Subject: Re: [boost] [iostreams]ANNOUNCE:indent_filtering_ostream.zip in vault
From: vicente.botet (vicente.botet_at_[hidden])
Date: 2010-01-11 07:14:31

Hi,
----- Original Message ----- 
From: "Larry Evans" <cppljevans_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Saturday, January 09, 2010 5:26 PM
Subject: [boost] [iostreams]ANNOUNCE:indent_filtering_ostream.zip in vault

> 
> The .zip file in subject is here:
> 
> http://www.boostpro.com/vault/index.php?&directory=Input%20-%20Output
> 
> It includes a boost/iostreams/filter/indent.hpp and
> boost/iostreams/utility/indent_filtering_ostream.hpp.
> 
> The latter uses the former to allow indenting and undenting
> a stream.
> 
> Is there any interest in installing this in the iostreams library?

Definitely.  

On the example I see that the ++ and -- are not pairwised. 
int main(void)
{
    boost::iostreams::indent_filtering_ostream<> mout(std::cout); 
    mout<<"line1\n";
+    ++mout; 
    mout<<"line1.1"<<std::endl; 
+    ++mout; 
    mout<<"line1.1.1"<<std::endl; 
    test_conversion(mout); 
-    --mout; 
    unsigned u=22; 
    mout<<"line1.2:unsigned="<<u<<std::endl; 
    float f=3.1416; 
    mout<<"line1.3:float="<<f<<std::endl; 
-    --mout; 
-    --mout; 
    mout<<"line2\n"; 
    return 0;
}

Shouldn't a scoped_indent class helps on this?
Best,
Vicente