From: ike@sverige.freeshell.org   
      
   On 2012-05-18, Francis Glassborow  wrote:   
   > On 18/05/2012 02:04, Ike Naar wrote:   
   >> On 2012-05-17, ravinder thakur  wrote:   
   >>> I am kind of puzzled by one simple c++ constuct. What should be the   
   >>> value of x after the statement:   
   >>>   
   >>> int x = 10;   
   >>> x = x++;   
   >>>   
   >>> I expect value of x to be 10 after the second assignment, however its   
   >>> coming out to be 11. Any ideas whats happening ?   
   >>   
   >> (Nit: there is no second assignment. The first line is not an   
   > assignment).   
   >>   
   >> The value of x equals 10 before the assignment.   
   >> If you want x to equal 10 after the assignment as well,   
   >> then you actually want the assignment not to change x.   
   >> So get rid of the assignment. Problem solved.   
   >>   
   >>   
   >   
   > Not so:   
   >   
   > void foo(int & i, int & j){   
   >      i=j++;   
   > }   
   >   
   > int main(){   
   >      int i{10};   
   >      foo(i, i);   
   > // problem occurs   
   > }   
   >   
   >   
   > We cannot simply avoid problem code unless we understand why it is a   
   > problem. And note that any reasonable compiler is going to inline foo()   
   > resulting in EXACTLY the original code.   
      
   No, the same argument applies to your example.   
      
   OP had the following code:   
      
        int i{10};   
        i = i++; // questionable action, intended to establish i == 10   
        // desired postcondition: i == 10   
      
   my advice was to get rid of the second line, because   
      
        int i(10);   
        // desired postcondition: i == 10   
      
   does the same thing.   
      
   You have the following code:   
      
        int i(10);   
        foo(i, i); // another questionable action, intended to establish i   
   == 10   
        // desired postcondition: i == 10   
      
   and, again, my advice is to get rid of the second line, because   
      
        int i(10);   
        // desired postcondition: i == 10   
      
   does the same thing.   
      
      
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