CppCon 2015: Scott Schurr “constexpr: Introduction”

[@VlazeChanel]

Trick with chocolate works fine on children and experienced programmers. Crossplatform like C++ at all.

[@bareya]

Chocolates, the most important part of constexpr education

[@TrueWodzu]

That was a good talk, Scott seems to be very nice guy :) Chocolate stuff needs just a bit of optimization :)

[@pizzabeerengineering2488]

Great talk. constexpr can reduce executable footprint but I used constexpr to compute a lookup table, greatly increasing code size in exchange for eliminating runtime calculation

[@RobBCactive]

I did similar in C by modifying the developed initialiser code to also write C for the table to stdout, which was put in an include file, allowing the original computation to be conditionally replaced, yet be regenerateable. Sometimes programs literally do write parts of themselves!

[@bdafeesh]

Great talk with a great speaker. But this talk should have had 1/5 of the interruptions. Even if I was there I would have been annoyed. Some questions are good, but this was way too many.

[@valetprivet2232]

that chocklate experiment was a bad idea ...

[@graphicsRat]

This is one of my top two favourite talks at cppcon2015 for the reason that it explains the basis of a new C++11 concept, namely constexpr. Scott if you're reading this first of all thank you. Secondly consider more introductory talks on C++11 features, for example variadic templates (Alexandrescu's presentation is the only one that I am aware of).

[@vertigo6982]

This comment is now deprecated.

[@krytharn]

Anyone else noticed the typo? "constexpor: Introduction" in the column on the left.

[@xpwnx1337]

There was a student that asked if the constexpr was part of the data type of that function he showed and the proffessor said it isn't. But it is. The return value becomes a constexpr return value.

[@prateekchs]

@17.06: Is that really true that we can't have non static member which is also constexpr??...i doubt because static in struct/class has different meaning than deducing something at compile time

[@binarytv2904]

this was eye opening! thank you so much.

[@CppCon]

Glad it was helpful!

[@subhamdubeyinfo]

Great Talk! Very Informative

[@MarekKnapek]

Is it possible to overload on `constexpr`? For example I have two algorithms for computing the same output and one is slow but can be made `constexpr` (slow compilation but zero time during run time) the other is faster (big O style faster) but cannot be made `constexpr`. More details: reddit.com/r/cpp/comments/3o52xh/cppcon_2015_scott_schurr_constexpr_introduction/cvu2zf0

[@lincolnsand5127]

I don't know, but you can overload on template enum class values

[@bareya]

I just watched this video to see if he runs out of the chocolates...

[@badasahog]

is a constexpr function the same thing as a pure function?

[@sufficientlyoldskool]

This guy seems nice, I like him.

[@LaurentLaborde]

too many questions but super good stuff anyway ! thx !

[@johan56]

I gave up halfway through. All the chocolate made the talk completely unwatchable. It's a pity - it could have been a good talk.

[@merictunc]

Great start to great talk

[@JosefdeJoanelli]

Love me some constexpooooor

[@tissuepaper9962]

I wish people in the comments would stop crying. Have they never been to a workshop-type talk?

[@rocknroooollllll]

I'm sure its a laudable idea this chocolate thing but please: for talks which probably have more of an online audience, please don't do that. Just try watching through your own presentation. It's really hard work: while encouraging questions is all fine & dandy, as an online viewer I found the number of interruptions difficult to deal with. It really, really badly disrupted the flow. I am *really* interested in the subject, but could easily switch off after 20 minutes because its just so damn annoying!

[@anfield6321]

Think of it this way. You can pause, think and rewind if needed. If you close it after 20 mins you can come back and watch it later

[@malharjajoo7393]

Can you stop crying ?

[@lindomar1838]

you need psychological treatment. or pay for a c ++ programming course ... to have the right to cry.

[@zackeemkhan1724]

I cannot endure this chocolate throwing. This is so annoying.

[@Qwantopides]

Agreed. Too many interruptions. Asking questions all the time without knowing what the rest of the presentation will be about is just a waste of time, as most questions will be answered right on the next slide.

[@origamibulldoser1618]

Can you static_assert(false, ""); instead of throw in const_expr functions?

[@whatsup9561]

void foo() throw(X,Y) is deprecated.

[@zackeemkhan1724]

FWIW please don’t do this chocolate thing again in the MIDDLE of the talk.

[@anokhkishore]

Chocolate chocolate chocolate constexpr chocolate .... heard chocolate more than constexpr .. too slow .... waste of time

[@origamibulldoser1618]

I feel like C++ is become an artform for its own sake.. It's entertaining but is it really productive?

[@paulfunigga]

Yea, but you don't have to learn all of it, just the basics when you apply for a job. Unless you apply for a job as an expert of c++.

[@IllumTheMessage]

For the majority of people no, but for specialists like some library writers, yes.

[@panjak323]

And yet we cant get even constexpr sqrt.

[@bobweiram6321]

It says a lot about the complexity of a language when you need to bribe your audience with chocolate in exchange for their participation.

[@steve122288]

a 1 hr long introduction? cmon this is 2017 enough of the bullshit scam college crap

[@xpwnx1337]

That's why I learn it on my own lol.

[@harehudi5117]

Zuckerkranken !!!

[@colin398]

Too many questions