Thread: variable variables

PHP has variable variables - which allow you to creat variables on the fly. I was wondering is C++ coudl do a similar thing?

For example, if i get a user to input their name, "John". This is saved in the variable UserName.

I then want to create an object of CreateUser, and their name IS the object.
ie. CreateUser John;

But this requires me to have previously set the name for the new object. "CreateUser UserName" is how it should be, but how am i able to access the value of UserName, so that an object called "John" is created and not called "UserName"?

You can use a map -

Code:

#include <iostream>
#include <string>
#include <map>
using namespace std;


int main() {
	
	map<string,string> stringVars;

	string varName;

	cout << "Enter Variable Name: ";
	cin >> varName;

	string var;

	cout << "Enter Variable: ";

	cin >> var;

	stringVars[varName]=var;

	string temp;

	cout << "Enter variable name: ";
	cin >> temp;
	cout << stringVars[temp] << endl;

	return 0;
}

ok i see how that works.

but now if i want to create an object of a class from this, how to i do it?

"className stringVars[varName];"

this doesnt seem to work out.

any ideas?

Erm... Nope.

i'm hoping its possible!

variable variables are one of the best hidden features of php!

the way in which c++ variables are declared are different, and so i dont think variable variables would exists as they do in php.
however im sure there is some way to get a similar effect, even with a lot more code....

btw, im only a beginner in c++ and im just trying to work it all out

Originally posted by fry
ok i see how that works.

but now if i want to create an object of a class from this, how to i do it?

"className stringVars[varName];"

this doesnt seem to work out.

any ideas?

Use

Code:

map<string,className> classVars;

.
.
.

string s;

cin >> s;

className cn = new className ( .... );

classVars[s]=cn;