Comments for Late Developer

Comment on Less Than Obvious by milton

milton — Sun, 17 Nov 2013 21:46:19 +0000

This is an interesting post. It helped me understand that, from the point of view of std::set (and others), if a is not < b, and b is not < a, then a and b are equivalent.

However your initial operator<() in the Point example does enforce Strict Weak Ordering, as it satisfies all of the properties thereof:

– ∀x it is not the case that x < x (irreflexivity)
– ∀x,y if x < y then it is not the case that y < x (asymmetry)
– ∀x,y,z if x < y and y < z then x < z (transitivity)
– ∀x,y,z if x is incomparable with y, and y is incomparable with z, then x is incomparable with z (transitivity of incomparability, although all Points are comparable)

The issue is with the equivalence classes that it creates in the set of Points: any 2 Points a and b are equivalent if a – b (or b – a) falls on quadrant II, quadrant IV, or a primary axis.

Thanks for the post, it helps make this subtle bug a little less less-than-obvious.

Comment on C++ Debug Macros by Neil Butterworth

Neil Butterworth — Fri, 07 Sep 2012 15:04:59 +0000

In reply to Anton Golov (@jesyspa).

Yes, but in real life I never seem to have those errors, so I never bother.

Comment on C++ Debug Macros by Anton Golov (@jesyspa)

Anton Golov (@jesyspa) — Fri, 07 Sep 2012 14:22:12 +0000

Would wrapping your macros in a do { } while(false) not remove some potential for errors?

Comment on How to install a C++ compiler on Windows by Neil Butterworth

Neil Butterworth — Thu, 29 Mar 2012 20:44:11 +0000

In reply to Danish.

> Can you please help in how to update the exisiting MinGW of code::blocks with this TDM MinGW32 rather then setting it up at a different place and then keeping the useless old one too?

Well, the old one may not be useless. But if you want to replace it, simply delete the root MinGW directory and install the TDM version in the same place.

Comment on How to install a C++ compiler on Windows by Danish

Danish — Wed, 28 Mar 2012 20:33:49 +0000

Can you please help in how to update the exisiting MinGW of code::blocks with this TDM MinGW32 rather then setting it up at a different place and then keeping the useless old one too?

Comment on How to install a C++ compiler on Windows by Sam

Sam — Wed, 29 Feb 2012 09:26:43 +0000

Thank you! I have been struggling with this all morning but have now managed to install a C ++ compiler with your instruction, hurrah!

Comment on Writing a Real C++ Program – Part 3 by Joshua

Joshua — Mon, 20 Feb 2012 17:13:48 +0000

This tutorial is amazing! The pedagogy and content are both superb. Thank you for providing this.

BTW: I arrived here from r/learnprogramming. This tutorial and the one about stringstreams are the most useful things since opposable thumbs.

Comment on Simple Input Bullet-Proofing In C++ by Neil Butterworth

Neil Butterworth — Sun, 22 Jan 2012 15:24:07 +0000

In reply to Jehjoa.

Those seem to be identical names to me. I think you must have mistyped something.

Comment on Simple Input Bullet-Proofing In C++ by Jehjoa

Jehjoa — Sun, 22 Jan 2012 14:50:49 +0000

In the template function you use numeric_limits::max(), shouldn’t that now be numeric_limits::max()?

Comment on Simple Input Bullet-Proofing In C++ by PB

PB — Sat, 21 Jan 2012 20:37:29 +0000

The first argument to ignore gets converted to a streamsize, which is only guaranteed to be one of the basic integer types and might not have the same numeric limits as int. So the call to ignore might not always empty the line.