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Why is a raven like a writing desk?

Thoughts both confusing and enlightening.

Why is a raven like a writing desk?

Thoughts both confusing and enlightening.

Category: C++

Compile-time counters, revisited

elbeno, 14 October, 201515 October, 2015

(Start at the beginning of the series – and all the source can be found in my github repo) Some time ago I read a blog post showing how to make a compile-time counter: a constexpr function that would return monotonically increasing integers. When I first read it I didn’t…

More string hashing with C++11 constexpr

elbeno, 14 October, 201515 October, 2015

(Start at the beginning of the series – and all the source can be found in my github repo) So FNV1 was easy, and Murmur3 wasn’t too much harder; for a challenge and to see how far I could go, I decided to try to compute an MD5 string hash…

C++11 compile-time string hashing

elbeno, 13 October, 201515 October, 2015

(Start at the beginning of the series – and all the source can be found in my github repo) Now that I was used to writing C++11-style constexpr, I decided to try some compile-time string hashing. It turns out that FNV1 is very easy to express in a move-down-the-string recursive…

More constexpr floating-point computation

elbeno, 13 October, 201515 October, 2015

(Start at the beginning of the series – and all the source can be found in my github repo) In the last post, I covered my first forays into writing C++11-style constexpr floating point math functions. Once I’d done some trig functions, exp, and floor and friends, it seemed like…

Floating-point maths, constexpr style

elbeno, 13 October, 201515 October, 2015

(Start at the beginning of the series – and all the source can be found in my github repo) To ease into constexpr programming I decided to tackle some floating-point maths functions. Disclaimer: I’m not a mathematician and this code has not been rigorously tested for numeric stability or convergence…

Experimenting with constexpr

elbeno, 13 October, 201515 October, 2015

Since seeing Scott Schurr at C++Now in Aspen and hearing his talks about constexpr, it’s been on my list of things to try out, and recently I got around to it. With the release of Visual Studio 2015, Microsoft’s compiler now finally supports C++11 style constexpr (modulo some minor issues),…

CppCon 2015

elbeno, 27 September, 201527 September, 2015

CppCon 2015 is over and I’m home from Bellevue. It was a really great week; I learned a lot, talked to lots of interesting folks, and traded C++ tips and techniques with the cognoscenti. Having been to C++Now, I knew a bunch of people already, which was a good leg-up…

Exercising Ranges (part 8)

elbeno, 1 July, 20152 July, 2015

(Start at the beginning of the series if you want more context.) Extras from the Haskell Prelude Having implemented iterate, there were a couple of other useful things from the Haskell Prelude that I wanted to have available with ranges. First, there’s cycle. It simply takes a finite range and…

Exercising Ranges (part 7)

elbeno, 1 July, 20151 July, 2015

(Start at the beginning of the series if you want more context.) Calculus operations It’s relatively simple to do differentiation and integration of power series, since they’re just regular polynomial-style. No trigonometric identities, logarithms or other tricky integrals here. Just the plain rule for positive powers of x. For differentiation,…

Exercising Ranges (part 6)

elbeno, 1 July, 20151 July, 2015

(Start at the beginning of the series if you want more context.) Multiplying power series Now we come to something that took considerable thought: how to multiply ranges. Doug McIlroy’s Haskell version of range multiplication is succinct, lazily evaluated and recursive. (f:ft) * gs@(g:gt) = f*g : ft*gs + series(f)*gt…

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