CFD Online Discussion Forums - How to read a list of integers from a string?

Quote:

Originally Posted by NotOverUnderated (Post 814885)

Hello,
I am trying to convert a word (string) to a list as follows:

Code:

List<Foam::label> indices;

const word w = "(0 0 0)";

w >> indices;

This doesn't work. I know I can read from a dictionary using lookup function but I want to know if it is possible to populate a list from a word containing the values using IStream or any other method without using a dictioanry.

Any ideas?

Thank you

Sure, there are a few ways to do that, but FWIW you would want a string not a 'word' for the intermediate anyhow since a "word" generally should not be containing spaces!

Code:

List<label> indices;





// Use a IStringStream

 string str("( 1 2 3 )");

IStringStream is1(str);

is1 >> indices;



// Parse tokenize directly

string str("( 1 2 3 )");

ITstream is2(str);

is2 >> indices;



// If you have read the input into a list of characters, received from a pipe or whatever

List<char> charbuffer = ....;



UIListStream is3(charbuffer);

is3 >> indices.



// Can even use the same thing for your string

string str("( 1 2 3 )");

UIListStream is4(str.data(), str.length());

is4 >> indices.

Still a few more methods on top of that. If you notice that the UIListStream just takes a pointer and num chars, you'll realize that you can also use these to write your own parser etc.