How to change delineator in iostream?

[Jennica Humphrey]

Let's say I have something like this:

ifstream inFile( buffer, ios::in );

while ( inFile >> name >> value ) { // read lines
cout << "Name: " << name << " Value: " << value;
}

The file reads one word at a time, which appears to be delineated by
whitespace or a newline. How do I change the delineator, for example,
using '=' instead of ' '?

 

[Jon Bell]

while ( inFile >> name >> value ) { // read lines
cout << "Name: " << name << " Value: " << value;
}

The file reads one word at a time, which appears to be delineated by
whitespace or a newline. How do I change the delineator, for example,
using '=' instead of ' '?

Use getline() instead of the >> operator. It allows you to specify a
terminator character in place of the default '\n'. For example, if you
have three tab-delimited fields per line (and each line is terminated by a
newline):

std::string field1, field2, field3;
while (getline (infile, field1, '\t') && getline (inFile, field2, '\t')
&& getline (inFile, field3))
{
cout << field1 << '\t' << field2 << '\t' << field3 << endl;
}

 

[Jason Leasure]

Let's say I have something like this:

ifstream inFile( buffer, ios::in );

while ( inFile >> name >> value ) { // read lines
cout << "Name: " << name << " Value: " << value;
}

The file reads one word at a time, which appears to be delineated by
whitespace or a newline. How do I change the delineator, for example,
using '=' instead of ' '?

A co-worker asked me this the other day, as it's apparently really easy
to do in Java..

I can't tell you exactly how, but I think you can do this by
constructing a locale with a ctype for which isspace returns true on '='
(and false on ' ', '\t', etc..) Then "imbue" whatever stream you want
to get input from with your new locale..

You could build a nice little stream manipulator which does this all for
you.



Jason

 

[Jennica Humphrey]

Thank you I did:

while ( inFile.getline( name, 40, '=' ) && inFile.getline( value, 50 ) )

and that did the trick.