Compiler Warning (level 1) C4715

'function' : not all control paths return a value

The specified function can potentially not return a value.

The following example generates this warning:

int func1( int i )
{
   if( i ) 
   return 3;  // warning, nothing returned if i == 0
}

To prevent this warning, modify the code so that all paths assign a return value to the function:

int func1( int i )
{
   if( i ) return 3;
   else return 0;     // OK, always returns a value
}

It is possible that your code may contain a call to a function that never returns, as in the following example:

int glue()
{
   if(...)
     return 1;
   else if(...)
     return 0;
   else
     fatal();
}

This code also generates an warning, because the compiler does not know that fatal never returns. To prevent this code from generating an error message, declare fatal using __declspec(noreturn).