Created attachment 416235 [details]
patch to solve the described problem in the hideshow package

Description of problem:
Try to use the hideshow package to hide the following c++ function:

inline int round_to_next_power2(register unsigned int x){
  //if(x!=32){
  x--;
  x |= (x >> 1);
  x |= (x >> 2);
  x |= (x >> 4);
  x |= (x >> 8);
  x |= (x >> 16);
  return x + 1;
  //}
}

The hideshow package does not take into account that the opening parenthesis is commented out: "//if(x!=32){"
Thus it will hide the function according to this parenthesis.

Version-Release number of selected component (if applicable):
All emacs versions (23.2, 23.1 and older)

How reproducible:
always

Steps to Reproduce:
1. load hideshow in .emacs: (require 'hideshow)
2. add c++ hook in .emacs: (add-hook 'c-mode-common-hook   'hs-minor-mode)
3. try to hide the shown c++ code (i.e. by C-c @ C-c)
  
Actual results:
inline int round_to_next_power2(register unsigned int x){
//if(x!=32){... }

Expected results:
inline int round_to_next_power2(register unsigned int x){... }

Additional info:
The problem can be solved by the attached patch