From: james.kanze@googlemail.com   
      
   On Tuesday, July 2, 2013 5:20:02 AM UTC+1, Öö Tiib wrote:   
   > On Tuesday, 2 July 2013 00:47:31 UTC+3, alan_mc...@this.is.invalid   
   wrote:   
   > > I keep seeing code of the form   
   > > (names withheld to protect the guilty :-)):   
      
   > >      T *t = new T( arg1, ... );   
   > >      if ( t )   
   > >      {   
   > >         // code that uses t   
   > >      }   
      
   > > My understanding was that "new" (in contrast to malloc())   
   > > never returns a null pointer; if it can't allocate the   
   > > memory (or if the constructor fails), an exception is   
   > > thrown.   
      
   > Yes, that if has been redundant for some time but possible   
   > overloading made it dim it throws or not. In C++11 it is clear.   
   > Their code should look like that in C++11 to have point:   
      
   >        T *t = new (std::nothrow) T( arg1, ... );   
   >        if ( t )   
   >        {   
   >           // code that uses t   
   >        }   
      
   > > So can I tell people who write code like this that the   
   > > "if" is redundant?  Or are there obscure cases where   
   > > "new" might return a null  pointer?   
      
   > Unless it is a code base that is still maintained using MSVC 5.0   
      
   Or Sun CC 4.1.  Or any number of really out of date compilers.   
      
   > (that did not throw bad_alloc) you should certainly point it out.   
      
   > > (Note: class T does not override any flavor of operator new.   
   > > Also, this is not C++77 or something.)   
      
   > When you override non-throwing new for T then you are expected to   
   > write it in C++11   
      
   But the standard doesn't require it.  It sounds like a good rule   
   to put into a coding guidelines.  To tell the truth I'd never   
   thought of it.  (But then, I suspect that overriding operator   
   new in a class is one of those advanced features that any one   
   using them would be advanced enough to do it right, even if   
   neither the standard nor the local coding guidelines require   
   it.)   
      
   --   
   James   
      
      
         [ See http://www.gotw.ca/resources/clcm.htm for info about ]   
         [ comp.lang.c++.moderated.    First time posters: Do this! ]   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)