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string to variable ?

Started by bilsa Sep 3, 2003 at 2:30 PM 3 replies 900+ views

Original Post

Sep 3, 2003 at 2:30 PM

Heh, I posted a message on the newbee forum about linked lists... but that post got totally messed up by me, so I'll give it another shot here. So after a couple of hours thinking about my problem my conclution is that what I need to do is something like this: Object { int nTestVariable; } char* sVariableName = "nTestVariable" object.sVariableName = 10; If i print object.nTestVariable, I want to get 10 as the result

That is the effect I would want to achieve. The important this is that I need to be able to do the //object.(still not choosen variable) object.sVariableName = 10; //object2.(still not choosen variable) object2.sVariableName = 20; thing. Would be greatful for any help !

[edited by - bilsa on September 3, 2003 3:32:59 PM]

Fruny

203

Fruny

Sep 3, 2003 at 2:40 PM

C++ has no introspection mechanism - you can't address variables 'by name'.

What language are you using ?

One option : pointers and member pointers.

int (Object::*sVariableName) = &Object::nTestVariable;

Object object;
object.*sVariableName = 10;

Odd the Hermit

Sep 3, 2003 at 2:42 PM

I think what you''re looking for is a map.


#include <map>
#include <string>

std::map<std::string,int> myVars;

myVars[ "SomeVariableName" ] = 12;

Am I correct?

-Odd the Hermit

Fruny

203

Fruny

Sep 3, 2003 at 2:45 PM

In combination with a map :


map<string, int (Object::*)> ObjectMemberMap;
ObjectMemberMap["nTestVariable"] = &Object::nTestVariable;

object.*ObjectMemberMap["nTestVariable"] = 10;

Note - the type of the member and the type of the pointer must match.

bilsa

Author

bilsa

Sep 3, 2003 at 2:48 PM

Yeh guys!

Thats what I'm looking for!

Thank you greatly!

(the combination of member pointer and map)

and combined with a template that would rock!

(though... what i actually needed was the "&Object::nTestVariable")

[edited by - bilsa on September 3, 2003 3:51:35 PM]

[edited by - bilsa on September 3, 2003 4:00:36 PM]

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