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Posted March 1, 2006 by William_Wilson in C programming
Last Updated on
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The following tech recipe describes how to implement a C++’s Destructor efficiently.
When writing a destructor, it is important to understand why and what you are writing before you begin.
*A structure and a pointer tech recipe are on the way to explain anything thing complex here.
To point or rather to not point: a destructor removes pointers in the case of manually watching your memory leak. This method is automatically called whenever an object loses scope.
The Scope is part of the code (e.g., method, class, etc.) in which a variable or parameter can be accessed.
Thus, it takes care of all local and dynamic variables for us, preventing memory leak if it is written properly.
*The example will be written as if it were inside a class which has a structure within it implementing a linked list by the pointer:
Next* next;
(which, of course, the struct is called Next)
Destructor Syntax:
~Destructor() {}
-A destructor never takes any parameters. Its only parameter is the implied one accessible by this.
-It always starts with a ~, tild or tilda, as it is known.
Now, within a structure implementing a linked list, this becomes the most crucial part of your code. The structure not only has things pointing to it, but it is also pointing to other objects of its own type. These all need to be handled dynamically, but how is this done?
*As stated previously, C++ will call this for every object, but we have no way to be sure that it will be efficient and call them in the reverse order in which they are pointing. If we were to delete the lead pointer only, it is possible that C++ would accept this as a completed destruction, which is not true.
As long as the other pointers and objects are linked, the memory is not freed, and we have memory leak.
So, we need to delete all pointers below the current this object to insure a proper destruction. If all goes well, each object will only destroy one pointer, but we cannot be sure of this.
This will require a loop and a temp variable (which we will also destroy at the end of the destructor).
Complete Linked List Destructor:
*This is within the Next structure, so it gets the title of its class or struct.
~Next(){
Next* n = this->next;
Next* nn = NULL;
while(n){
nn = n->next;
delete n;
n = nn;
}
nn = NULL;
n = NULL;
}
-This loop is based on n which is true as long as n is not NULL. (e.g., There is another Next object in the linked list.)
This code iterates through the linked list objects and deletes the pointers one by one, once it is finished with all pointers below itself setting the temporary variables to NULL. This will allow the GC or Garbage Collector to destroy them.
This example is meant to improve your knowledge of memory leak. The less leakage there is in your own programs, the better because we all know that Operating Systems are not leak free. The more help we can give them, the better.
Questions/Comments: [email protected]
-William. §
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re·con·struct
(rē′kən-strŭkt′)tr.v.re·con·struct·ed, re·con·struct·ing, re·con·structsreconstruct
(ˌriːkənˈstrʌkt) vb (tr)re•con•struct
(ˌri kənˈstrʌkt)v.t.
reconstruct
Past participle: reconstructed
Gerund: reconstructing
Imperative |
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reconstruct |
reconstruct |
Present |
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I reconstruct |
you reconstruct |
he/she/it reconstructs |
we reconstruct |
you reconstruct |
they reconstruct |
Preterite |
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I reconstructed |
you reconstructed |
he/she/it reconstructed |
we reconstructed |
you reconstructed |
they reconstructed |
Present Continuous |
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I am reconstructing |
you are reconstructing |
he/she/it is reconstructing |
we are reconstructing |
you are reconstructing |
they are reconstructing |
Present Perfect |
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I have reconstructed |
you have reconstructed |
he/she/it has reconstructed |
we have reconstructed |
you have reconstructed |
they have reconstructed |
Past Continuous |
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I was reconstructing |
you were reconstructing |
he/she/it was reconstructing |
we were reconstructing |
you were reconstructing |
they were reconstructing |
Past Perfect |
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I had reconstructed |
you had reconstructed |
he/she/it had reconstructed |
we had reconstructed |
you had reconstructed |
they had reconstructed |
Future |
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I will reconstruct |
you will reconstruct |
he/she/it will reconstruct |
we will reconstruct |
you will reconstruct |
they will reconstruct |
Future Perfect |
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I will have reconstructed |
you will have reconstructed |
he/she/it will have reconstructed |
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they will have reconstructed |
Future Continuous |
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I will be reconstructing |
you will be reconstructing |
he/she/it will be reconstructing |
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Present Perfect Continuous |
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I have been reconstructing |
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you have been reconstructing |
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Future Perfect Continuous |
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I will have been reconstructing |
you will have been reconstructing |
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you will have been reconstructing |
they will have been reconstructing |
Past Perfect Continuous |
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I had been reconstructing |
you had been reconstructing |
he/she/it had been reconstructing |
we had been reconstructing |
you had been reconstructing |
they had been reconstructing |
Conditional |
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Verb | 1. | reconstruct - reassemble mentally; 'reconstruct the events of 20 years ago' retrace, construct hypothesise, hypothesize, speculate, conjecture, theorise, theorize, hypothecate, suppose - to believe especially on uncertain or tentative grounds; 'Scientists supposed that large dinosaurs lived in swamps' etymologise, etymologize - construct the history of words |
2. | reconstruct - build again; 'The house was rebuild after it was hit by a bomb' construction, building - the act of constructing something; 'during the construction we had to take a detour'; 'his hobby was the building of boats' build, construct, make - make by combining materials and parts; 'this little pig made his house out of straw'; 'Some eccentric constructed an electric brassiere warmer' | |
3. | reconstruct - cause somebody to adapt or reform socially or politically alter, change, modify - cause to change; make different; cause a transformation; 'The advent of the automobile may have altered the growth pattern of the city'; 'The discussion has changed my thinking about the issue' | |
4. | reconstruct - return to its original or usable and functioning condition; 'restore the forest to its original pristine condition' decompress, uncompress - restore to its uncompressed form; 'decompress data' regenerate, renew - reestablish on a new, usually improved, basis or make new or like new; 'We renewed our friendship after a hiatus of twenty years'; 'They renewed their membership' rehabilitate - help to readapt, as to a former state of health or good repute; 'The prisoner was successfully rehabilitated'; 'After a year in the mental clinic, the patient is now rehabilitated' rehabilitate - restore to a state of good condition or operation defibrillate - stop the fibrillation and restore normal contractions, usually by means of electric shocks; 'The patient's heart had to be defibrillated to save his life' | |
5. | reconstruct - do over, as of (part of) a house; 'We are remodeling these rooms' remodel, redo alter, change, modify - cause to change; make different; cause a transformation; 'The advent of the automobile may have altered the growth pattern of the city'; 'The discussion has changed my thinking about the issue' |
reconstruct
verbreconstruct
verbTo bring back to a previous normal condition:reconstruct
[ˈriːkənˈstrʌkt]VT [+ building] → reconstruir; [+ crime, scene of crime] → reconstituirreconstruct
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