Should the if((int val = getvalue()) == x) form work

This form does not compile with my VS2008 compiler. Should it be possible?

#include <iostream>
 using namespace std;
 
 int getvalue() { return 3; }
 
 int main(int argc, char* argv[])
 {
 if((int val = getvalue()) == 3)
     cout << "val=" << val << "\n";
 return 0;
 }
 

This form does work.
...

int val;
 if((val = getvalue()) == 3)
 
 ...
 

Why does it not work?

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