Hi all
Can anybody give me a quick code snippet to compare the contents of two istreams?
In particular, I would like to be able to use this code to compare a stringstream with an ifstream, but hopefully it will generalise to pairs of istreams in general?
Code should work with MinGW and Linux (GCC). The application is for testing some routines that makes ostream output; I want to check the expected output against the real output. I'm just not sure what the preferred and efficent approach here would be, in line with STL principles.
Thanks for any ideas!
Cheers
JP
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For line-by-line comparison you can use this.
bool isEqual(istream & in1, istream & in2)
{
string str1, str2;
do
{
getline(in1, str1);
getline(in2, str2);
if (str1 != str2)
return (false);
if (in1.eof() && !in2.eof())
return (false);
if (!in1.eof() && in2.eof())
return (false);
}while(!in1.eof() && !in2.eof());
return (true);
}
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by: rajeev_devinPosted on 2006-11-15 at 23:03:20ID: 17953894
You can do like this
bool isEqual(istream & in1, istream & in2)
{
char ch1, ch2;
while (in1.get(ch1))
{
if (!in2.get(ch2) || (ch1 != ch2))
return (false);
}
if (!in2.get(ch2))
return (true);
else
return (false);
return (false);
}