check for a substring:

faizlo · 09-27-2010, 01:28 PM

Hi,

I have a macro which I use with ROOT.
In this macro I want to check if a part of string exist so I can ignore it inside a loop. So, inside a loop I want to have something like:

Code:

if (string == "pre_ti_data_bdt*" || string == "pre_ti_data_nn*")
continue;

but of course I cannot use * in this piece of code!
How to do this trick in C++?

~faizlo

tuxdev · 09-27-2010, 01:40 PM

strncmp() or whatever equivalent is in the std::string class.

Oh.. and why are you using macros? Various features of C++ almost entirely eliminate any good reason to use them.

Guttorm · 09-27-2010, 01:42 PM

You're translating from shell to C++?

man glob

Can help and good luck

faizlo · 09-27-2010, 01:43 PM

How would this be used in the above piece of code?

faizlo · 09-27-2010, 01:43 PM

Guttorm,

No I am not translating from a script.

graemef · 09-27-2010, 08:03 PM

Okay C++... what data type is your variable string? If it is a std::string then look at the function find()

Code:

if (string.find("pre_ti_data_bdt")==0))

you can change the rhs to being != std::string::npos if you want a match anywhere in the string.

Variable name of string is not ideal but maybe that was just for illustrative purposes.