Is the behavior of return x++; defined?

c++ return post-increment
patros picture patros · Mar 4, 2010 · Viewed 17.4k times · Source

If I have for example a class with instance method and variables

class Foo
{

   ...

   int x;
   int bar() { return x++; }
 };

Is the behavior of returning a post-incremented variable defined?

Answer

Peter Alexander picture Peter Alexander · Mar 4, 2010

Yes, it's equivalent to:

int bar()
{
  int temp = x;
  ++x;
  return temp;
}

Related questions

Return array in a function

I have an array int arr[5] that is passed to a function fillarr(int arr[]): int fillarr(int arr[]) { for(...); return arr; } How can I return that array? How will I use it, say I returned a pointer how am …

Read More
How to return a struct from a function in C++?

I've tried on a few different forums and can't seem to get a straight answer, how can I make this function return the struct? If I try 'return newStudent;' I get the error 'No suitable user-defined conversion from studentType …

Read More
How to break out of a function

If I have a function as follows: void func () { //... if (condition) { break; } } When I use break it gives me an error. Is there another way to exit a function using an if condition and to complete compiling the code normally?

Read More