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Unread 12-07-2014, 11:15
E Dawg E Dawg is offline
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Reference text file in C++

I know that it is possible to reference a text file in C++ so that you are able to change variables without having to rebuild every time you want to change a constant. Does anyone know how to do that, and if so could you tell me how?

Thanks,
E Dawg
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Unread 12-07-2014, 12:35
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Re: Reference text file in C++

Check out RAWCConstants.
It was developed by other FRC teams and we stole shamelessly. It's been super useful.

Edit: it was pointed out to me that I was violating the license agreement. I've removed the link to our repo. I'm not sue the official source for the tool. I wasn't part of our original implementation.

Last edited by Jefferson : 12-07-2014 at 21:17. Reason: Licensing stuff
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Unread 12-07-2014, 14:49
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Re: Reference text file in C++

How much do you understand about file i/o in general?
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Unread 12-07-2014, 15:26
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Re: Reference text file in C++

http://www.cplusplus.com/doc/tutorial/files/
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Unread 14-07-2014, 09:32
E Dawg E Dawg is offline
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Re: Reference text file in C++

Quote:
Originally Posted by Joe Ross View Post
How much do you understand about file i/o in general?
Not that much. I've never really worked with it before.
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Unread 14-07-2014, 12:57
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Re: Reference text file in C++

A simple way to do this in C++

Code:
#include <fstream>
#include <string>
#include <map>

...

std::ifstream constants("constants.txt");

std::map<std::string, double> data;

std::string name;
double value;

while(constants >> name >> value)
{

data[name] = value;
}
and a sample constants file

Code:
test 1
asdf 2.0
pi 3.14
negative -12.34
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