In Mac programming (pre-OSX) it was common for the OS to give you memory blocks not using a pointer, but using a 'handle', which under Mac OS<=9 meant "a pointer to a pointer" (where the direct pointer was under OS control so that it could move memory blocks around in low-memory situations. By comparison, a 'handle' in Windows is a "memory block the contents of which you don't know what they are". On Mac OS<=9, you did know the contents; you just had to double-dereference your pointer to reach them)
This meant that when accessing data through these handles, you had to write code like this:
(*handle)->field;
or
(**handle).field;
Eventually, someone coined a pseudo-operator for reaching fields from a handle without requiring parentheses:
handle[0]->field;
[0]-> was named the "sproing" operator (on the theory that it indicates the desired value popping out of a box).
> By comparison, a 'handle' in Windows is a "memory block the contents of which you don't know what they are".
This is incorrect.
In Windows, the HANDLE is a typedef for a void pointer, but its usage is usually 100% analogous to a file descriptor - i.e. it is a token passed to kernel space, where the kernel looks it up in a per-process table of open files. I say "usually" because some components have re-used the HANDLE typedef for things which are not kernel objects - for example the HANDLE that comes from FindFirstFile() is actually a pointer to a structure in user-space [which AFAIK itself has a HANDLE to the directory].
True! That was a disaster; only 64K (16 bits) handles were possible across all processes. Many APIs had to be deprecated and redesigned when it went 32-bit.
I've argued for using uuids for handles from here on out. They are endless; no effort to coordinate handle spaces is ever needed; they work locally and on the network; on some architectures they are even a register width scalar.
In addition to the rightward arrow, there's the leftward arrow:
int x = 3;
while(n <-- x) {
cout << x << endl;
}
which is different because it doesn't include the lower bound `n`. And of course, if typing the ">" is too taxing, the "---" operator is equivalent to the "-->" operator: