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Re^5: Why is a hash the default "object" in oo perl?

by crabbdean (Pilgrim)
on Jul 19, 2004 at 23:38 UTC ( #375739=note: print w/replies, xml ) Need Help??

in reply to Re^4: Why is a hash the default "object" in oo perl?
in thread Why is a hash the default "object" in oo perl?

I recently just starting using Devel::Peek to look at my data structures. I love it. After reading the module doco you get an idea of the output from Devel::Peek and the structure of what you are seeing. It shows a wealth of data about your objects, hashes, variables, their types, reference counts, length, size, addresses and so on. It will even show what class your objects are blessed into. Very cool!

Note: It will only show the first 4 elements of a structure unless you specify for it to show more by sending it an additional integer. eg. Devel::Peek::dump(\%hash, 8)

For example this is 4 element dump of my %hash:
SV = RV(0x1a7ba4c) at 0x1bd1e98 <<--## a scalar that is a ref REFCNT = 1 <<--## Its ref count FLAGS = (TEMP,ROK) RV = 0x1b5e014 <<--## The ref value SV = PVHV(0x1b25384) at 0x1b5e014 <<--## the scalar ref points to a + hash REFCNT = 2 <<--## The hashes ref count FLAGS = (PADBUSY,PADMY,SHAREKEYS) IV = 1 NV = 0 ARRAY = 0x1a49e84 (0:7, 1:1) hash quality = 100.0% KEYS = 1 FILL = 1 MAX = 7 RITER = -1 EITER = 0x0 Elt ".*" HASH = 0xaeb62926 <<--## First element of hash SV = RV(0x1a7ba3c) at 0x1bd1e8c <<--## is a scalar ref REFCNT = 1 FLAGS = (ROK) RV = 0x1bce2c4 SV = PVAV(0x1bcb7c4) at 0x1bce2c4 <<--## which points to an arra +y with 5 references REFCNT = 5 FLAGS = () IV = 0 NV = 0 ARRAY = 0x1a49634 FILL = 1 MAX = 1 ARYLEN = 0x0 FLAGS = (REAL) Elt No. 0 <<--## Element zero of that array SV = PV(0x1b3dbf0) at 0x1bd8098 REFCNT = 1 FLAGS = (POK,pPOK) PV = 0x1a4980c "return_me"\0 <<--## its value CUR = 9 LEN = 10 Elt No. 1 <<--## ... and so on SV = PV(0x1a6097c) at 0x1bd80b0 REFCNT = 1 FLAGS = (POK,pPOK) PV = 0x1a49834 "fullfile"\0 CUR = 8
Anyway, it blows my hair back :-)

The Funkster of Mirth
Programming these days takes more than a lone avenger with a compiler. - sam
RFC1149: A Standard for the Transmission of IP Datagrams on Avian Carriers

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Re^6: Why is a hash the default "object" in oo perl?
by diotalevi (Canon) on Jul 19, 2004 at 23:47 UTC
    Devel::Peek is geared to people debugging perl internals - this isn't the tool you'd normally use when just trying to discover the structure of something. Data::Dumper is the built-in natural for that. demerphq's Data::Dump::Streamer is a separate install but it gets even closer to the actual structure.

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