Phobject.php
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	<?php

	/**
	* Base class for libphutil objects. Enforces stricter object semantics than
	* PHP.
	*
	* When a program attempts to write to an undeclared object property, PHP
	* creates the property. However, in libphutil this is always an error (for
	* example, a misspelled property name). Instead of permitting the write,
	* subclasses will throw when an undeclared property is written.
	*
	* When a program attempts to iterate an object (for example, with `foreach`),
	* PHP iterates its public members. However, in libphutil this is always an
	* error (for example, iterating over the wrong variable). Instead of
	* permitting the iteration, subclasses will throw when an object is iterated.
	*
	* (Legitimately iterable subclasses can provide a working implementation of
	* Iterator instead.)
	*/
	abstract class Phobject implements Iterator {

	public function __set($name, $value) {
	throw new DomainException(
	pht(
	'Attempt to write to undeclared property %s::%s.',
	get_class($this),
	$name));
	}

	public function current() {
	$this->throwOnAttemptedIteration();
	}

	public function key() {
	$this->throwOnAttemptedIteration();
	}

	public function next() {
	$this->throwOnAttemptedIteration();
	}

	public function rewind() {
	$this->throwOnAttemptedIteration();
	}

	public function valid() {
	$this->throwOnAttemptedIteration();
	}

	private function throwOnAttemptedIteration() {
	throw new DomainException(
	pht(
	'Attempting to iterate an object (of class %s) which is not '.
	'iterable.',
	get_class($this)));
	}

	}