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In what order are local scoped objects destructed?


In what order are local scoped objects destructed?

By : deepa
Date : November 26 2020, 01:01 AM
around this issue Will foo be destructed before bar, after bar, or is there no guarantee either way? , They are destroyed in the reverse order of their declaration. In
code :


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Are local objects destructed in the case of a leave on Symbian?

Are local objects destructed in the case of a leave on Symbian?


By : Random Binaries
Date : March 29 2020, 07:55 AM
will help you Yes, automatic variables are properly destructed. Since (I think) version 9.1 of Symbian OS, leave is implemented using C++ exceptions.
Earlier versions of Symbian did not support exceptions at all, hence the whole cleanup stack mechanism. Automatic variables would not have had their destructors called when leaving.
In which order are objects destructed in PHP?

In which order are objects destructed in PHP?


By : publy
Date : March 29 2020, 07:55 AM
seems to work fine First of all, a bit on general object destruction order is covered here: https://stackoverflow.com/a/8565887/385378
In this answer I will only concern myself with what happens when objects are still alive during the request shutdown, i.e. if they were not previously destroyed through the refcounting mechanism or the circular garbage collector.
code :
int symbols;
do {
    symbols = zend_hash_num_elements(&EG(symbol_table));
    zend_hash_reverse_apply(&EG(symbol_table), (apply_func_t) zval_call_destructor TSRMLS_CC);
} while (symbols != zend_hash_num_elements(&EG(symbol_table)));
zend_objects_store_call_destructors(&EG(objects_store) TSRMLS_CC);
zend_objects_store_mark_destructed(&EG(objects_store) TSRMLS_CC);
<?php

class A {
    public $state = 'not destructed';

    public function __destruct() { $this->state = 'destructed'; }
}

class B {
    protected $a;

    public function __construct(A $a) { $this->a = $a; }

    public function __destruct() { var_dump($this->a->state); }
}

$a = new A;
$b = new B($a);

// prevent early destruction by binding to an error handler (one of the last things that is freed)
set_error_handler(function() use($b) {});
Is it a bad practice to rely on local objects get destructed in the reverse order of construction in c++

Is it a bad practice to rely on local objects get destructed in the reverse order of construction in c++


By : Satish Sukumar
Date : March 29 2020, 07:55 AM
like below fixes the issue Reverse order of destruction is guaranteed for automatic variables. Same guarantee is there for destruction order of class member variables. Use it to your advantage.
Are objects bound to local references automatically destructed?

Are objects bound to local references automatically destructed?


By : Shinichiro Maeda
Date : March 29 2020, 07:55 AM
this one helps. Consider the following code.
code :
MyImage& image = MyImage(-1); // initialized with invalid handle
const MyImage& image = MyImage(-1); // initialized with invalid handle
Are global objects guaranteed to be destructed after all thread-local-storage objects are destructed?

Are global objects guaranteed to be destructed after all thread-local-storage objects are destructed?


By : Melike Topcu
Date : March 29 2020, 07:55 AM
it helps some times , Yes it does.
Section [basic.start.term] in the language spec says
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