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added OOP approach for BST #966

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added OOP approach for BST #966

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@Dharni0607
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Dharni0607 commented Jul 21, 2020 •
edited by gitpod-io bot

Added object oriented approach for BST. Please review and let me know if any changes are required.
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added OOP approach for BST
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e94f7f0
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lgtm-com bot commented Jul 21, 2020

This pull request introduces 4 alerts when merging e94f7f0 into 8d68e61 - view on LGTM.com

new alerts:

  • 4 for Mismatching new/free or malloc/delete
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kvedala commented Jul 21, 2020

Thank you for your contribution 👍
Please note the following:

  1. Please do not delete the author checks in the description and add appropriate description. It is meant to facilitate contribution by authors to maintain repo standards
  2. please ensure the self-tests pass
  3. please ensure to read the contribution guidelines - code needs to be documented per doxygen standards to ensure that a layman can read and learn from your code
  4. Please ensure to fix the alerts reported by LGTM.
@kvedala kvedala linked an issue that may be closed by this pull request Jul 21, 2020
[Suggestion] Better Implementation for BST #777
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@Dharni0607
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Dharni0607 commented Jul 21, 2020

Ok. I will make the changes.
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kvedala commented Jul 21, 2020

Ok. I will make the changes.

Thank you. Please review code in this file as well for reference.
@Panquesito7
Panquesito7 requested changes Jul 21, 2020
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Panquesito7 left a comment

Thank you for your contribution.
Please consider the following:

1. Document what functions do, and what parameters do.
2. Use a namespace and save all the functions and classes there.
3. Free up allocated memory.
4. Address other review comments.
data_structures/binary_search_tree_OOP_approach.cpp Outdated

#include<bits/stdc++.h>
#include<queue>
using namespace std;

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Panquesito7 Jul 21, 2020

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Please remove this and use std:: where necessary.
data_structures/binary_search_tree_OOP_approach.cpp
* \Object Oriented approach
*/

#include<bits/stdc++.h>

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Don't use this library as it slows down the compilation process and is quite Linux-specified.
data_structures/binary_search_tree_OOP_approach.cpp
#include<queue>
using namespace std;

struct node {

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Undocumented struct.
data_structures/binary_search_tree_OOP_approach.cpp
root = NULL;
}

void insert(int data){

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Undocumented class function.
data_structures/binary_search_tree_OOP_approach.cpp Outdated
void insert(int data){
node *newnode = new node;
newnode->value = data;
newnode->left = NULL;

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Please use nullptr here, and in other parts of the code.
data_structures/binary_search_tree_OOP_approach.cpp Outdated
return current;
}

node *deleteNode(node *current, int target){

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Same here and other functions above.
data_structures/binary_search_tree_OOP_approach.cpp
}
};

int main() {

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Please add a comment structure like:

/**
 * Main function
 */
data_structures/binary_search_tree_OOP_approach.cpp Outdated
break;
case 6:
BST.postOrder(BST.getRoot());
break;

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Missing default statement.
data_structures/binary_search_tree_OOP_approach.cpp Outdated
}

void insert(int data){
node *newnode = new node;

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Allocated memory is not freed/released.
data_structures/binary_search_tree_OOP_approach.cpp Outdated
/**
* \file
* \brief A simple tree implementation using structured nodes
* \Object Oriented approach
*/
Comment on lines 1 to 5

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As @kvedala mentioned, please update this comment block like in skip_list.
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Panquesito7 commented Jul 21, 2020

Please fix clang-tidy warnings.
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kvedala commented Jul 21, 2020

Please fix clang-tidy warnings.

Please, avoid posting multiple reviews until at least one of them is complete. Multiple reviews confuse the authors and create an unnecessary branching of fixes.
@Dharni0607 Dharni0607 force-pushed the Dharni0607:issue_#777 branch from e92f685 to 361ec59 Jul 23, 2020
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Dharni0607 commented Jul 23, 2020

Hi @kvedala @Panquesito7 , I have updated the PR, there are couple of errors and warnings for destructor method and deletion of node. Can you please guide me.
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kvedala commented Jul 23, 2020 •
edited

Thank you for the fixes, @Dharni0607.

While the documentation fixes still remain, please note the following concerning the errors reported by the CI:

  1. /home/runner/work/C-Plus-Plus/C-Plus-Plus/data_structures/binary_search_tree_oop_approach.cpp:25:7: error: class 'BinarySearchTree' defines a non-default destructor but does not define a copy constructor, a copy assignment operator, a move constructor or a move assignment operator [cppcoreguidelines-special-member-functions,-warnings-as-errors]
    This error asks to create a copy or assignment operator to the class. You can define one as
class BinarySearchTree {
public:
    BinarySearchTree(BinarySearchTree const&) = delete;
    BinarySearchTree& operator =(BinarySearchTree const&) = delete;
}

as class member functions

  1. this can be avoided by the second suggestion made: Use std::shared_ptr or std::unique_ptr functions of smart pointers feature of C++11 that will take care of memory de-allocation and thus make the destructor function useless.

Without the use of smart pointers, the implementation is so rudimentary that it can be implemented almost verbatim as a C program.
@Dharni0607 Dharni0607 force-pushed the Dharni0607:issue_#777 branch 4 times, most recently from 068f8c4 to 26eebec Jul 23, 2020
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kvedala commented Jul 23, 2020

The error mentions that either

  • both copy constructor and the destructor should be defined
  • or neither should be custom defined
@Dharni0607
Merge branch 'master' of https://github.com/TheAlgorithms/C-Plus-Plus …
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08a8f34 
…into issue_#777
@Dharni0607 Dharni0607 force-pushed the Dharni0607:issue_#777 branch from 26eebec to 08a8f34 Jul 23, 2020
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kvedala commented Jul 23, 2020

  1. Missing move constructor:
BinarySearchTree(BinarySearchTree const&&) = delete;
  1. Error on line 81: /home/runner/work/C-Plus-Plus/C-Plus-Plus/data_structures/binary_search_tree_oop_approach.cpp:157:41: error: parameter 'n' is passed by value and only copied once; consider moving it to avoid unnecessary copies [performance-unnecessary-value-param,-warnings-as-errors]
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Panquesito7 commented Jul 23, 2020

@Dharni0607 open the Gitpod link above and open the file you added.
There are some clang-tidy suggestions and quick-fixes there.

If you are still a bit confused, I can make a review fixing various clang-tidy warnings. 🙂
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[Suggestion] Better Implementation for BST
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