I don’t really know myself, probably the many footguns and complexities. Like taking a reference to a value in a vector and then resizing the vector, boom undefined behaviour. There a re a lot of things like this. Maybe also the verbosity and multie ways to do things. Look at the linked code, there is a lot of overhead to the function definitions, sure there is a point to all of it and I put it there for a reason, but to people less familiar to the language it is probably quite offputting.

Personally I like the language, second only to rust for me

I wasn’t sure which word to use so wikipedia to the rescue https://en.wikipedia.org/wiki/Bracket

You can overload the indexing operazor “[]” (std::vector does this for example), and since c++23 this operator can have more than one argument.

The last one is a constructor call with an overloaded conversion operator. The {} syntax is possible since c++11 I think. The conversion operator was already available before that

Good point regarding the {} implementation.

I disagree slightly regarding your point that these aren’t function calls. Yes technically they are different things but effectively they are functions, I cann pass arguments and get a result based on some operations.

Of course not all of these can do anything but only the constexpr value is actually pretty limited. The other ones are straight up functions