Have you ever hoped that C++ would have digit separators? That you wouldn’t have to strain your eyes when reading 2147483647 (is it std::numeric_limits<int32_t>::max(), or is it just similar)? That you wouldn’t have to count the zeros 5 times when typing 1000000000?
Well, the C++ Standards Committee doesn’t have your back. Oh, sure, they have introduced a digit separator, – ‘, but it’s completely unusable in production code! Here’s why.
A few weeks ago Gynvael Coldwind announced a contest (I’m sorry, the link is in Polish) related to his excellent OS dev streams (again, in Polish, but if you do understand it, definitely consider watching them). The task was simple: make a BIOS-bootable diskette image with the prettiest graphical effect; all in 16-bit text mode, with binary size limit of 512 bytes.
Hello, everyone. It has been a while since my last post.
While watching CppCon 2014 I found this little gem being described by Scott Meyers.
Consider the following code:
decltype(auto) foo() { static int Foo; return Foo; } decltype(auto) bar() { static int Bar; return (Bar); } int main() { decltype(auto) a = foo(); decltype(auto) b = bar(); a++; b++; cout << foo() << ", " << bar() << endl; } |
Would you expect this to print 0, 0? Well, not so fast. decltype(auto) is just a nicer syntax for decltype(name), where name is “unparenthesized id-expression or an unparenthesized class member access”, as described here. Therefore it follows the same rules.
That’s another corner case to remember, but I guess it could also make a nifty party trick, if one can find the right party.