Can C++ differentiate between a compile time constant and a variable passed to a function?

Asked May 16 '16 at 02:12

Active May 16 '16 at 02:12

Viewed 57 times

I don't think this is possible (at least not as of c++11), but is there a function signature that can differentiate between a passed compile time constant (includes constexpr results that are calculated at compile time) and a variable?

I'm writing a library where this could be useful under some very specific cases and if I can infer these, then the library could save some CPU cycles, without the developer having to do the analysis themselves.

asked May 16 '16 at 02:12

Adrian

10,246
4
44
110

The short answer is: nope. – Sam Varshavchik May 16 '16 at 02:17
Thanks @BinaryBirchTree. Didn't find that before. – Adrian May 16 '16 at 02:30
@Adrian : At least your title was better. ;-] – ildjarn May 16 '16 at 02:47
@SamVarshavchik, the slightly longer answer is maybe. :D – Adrian May 16 '16 at 19:38
A solution as macro is provided here: http://stackoverflow.com/a/13305072/34509 – Johannes Schaub - litb May 25 '16 at 16:29

Can C++ differentiate between a compile time constant and a variable passed to a function?

0 Answers0