NegBool

Files CCore/inc/gadget/NegBool.h CCore/src/gadget/NegBool.cpp

NegBool is a simple proxy class, designed to return a logically negative value.

class NegBool
 {
   bool nok;

  public:

   NegBool(bool nok_=false) : nok(nok_) {}
 
   bool operator ! () const { return nok; }
 };

Assume you have a function with a logically negative return value:

bool func()
 {
  bool nok;

  ....

  return nok;
 }

When you check the result of the function you will have a code like this:

if( func() ) // not clear way to express a error case
  {
   // handle failure
  }

You can use the class NegBool to warp the return value:

NegBool func()
 {
  bool nok;

  ....

  return nok;
 }

Then you have the following code, logically the same as above:

if( !func() ) // using operator ! to express a error case
  {
   // handle failure
  }