Re: how internally $#array is working in Perl

[JavaFan]

Please explain me about how $#array is internally working.

Not much magic going on. Internally, an array is represented by an AV structure (a C struct). The first field points to an xpvav structure (another C struct). Here, the second field, called FILL, is an integer holding the current size of the array.

The size of the array, plus the value of $[ is enough to calculate the size of $#array.

Illustrated details.

[ikegami]

Actually, because $#array can be used as an lvalue, a fair bit of magic is going on (including adding "magic" to both the returned scalar and the array in some circumstances). Fortunately, it is invisible to the user.
Read more... (1405 Bytes)