Problem in the variation of function used in transform() (stl C++)

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C++

STL

here goes my code.
i have posted the problems and my tried things in the comments . please do check it.
Thanks.

int  change(int x)
{
	//this function works as transform last argument and multiplies all element of vector a by 10 and store them into b.
	x = x * 10;
	return x;
} 
void change_ref(int &x)
{
	//this function doesn't work as transform last argument.
	//error shown : binary =... no operator takes a right hand operand of type void ( or there is no acceptable conversion)
	// what i want to do is to pass by reference the values so that i dont have to return anything.
	x = x * 10;
}
int main()
{
	vector<int>a = { 1,2,3 };
	vector<int>b;
	transform(a.begin(), a.end(), back_inserter(b),change);
	for (int i = 0; i < b.size(); i++)
	{
		cout << b[i] << endl;
 	}
	//b : {10,20,30}  -->desired output.
	return 0;
}

What I have tried:

i have tried doing the following CHANGE function that works perfectly fine ..even in c++11 i have also tried using the lambda function that also works perfectly fine .i just want to know how to pass these values by reference so that i dont have to return anything back to the function.