Checking for valid input in inputfile

[Oswld]

Hey, I'm writing a program that involves file writing. I have a question regarding that. I am reading the info from the file into 3 strings and my question is, is there any way to check for valid input. I tried using an if with something like this

ifstream inputfile;
inputfile.open(name.c_str());

if(!inputfile >> string1 >> string2 >> string3) throw 3;

but it shoots

no match for bool >> String& operator

Is there a way i can do this?

[JLBorges]

Check operator precedence!

if( !( inputfile >> string1 >> string2 >> string3 ) ) throw 3 ;

Or:

if( inputfile >> string1 >> string2 >> string3 ) { /* process input */ }
else throw 3 ;

[Oswld]

Oh wow... I feel dumb...
Thank youu