Questions tagged [stl]
The Standard Template Library, or STL, is a C++ library of generic containers, iterators, algorithms, and function objects. When C++ was standardised, large parts of the STL were adopted into the Standard Library, and these parts in the Standard Library are also sometimes referred to collectively as "the STL".
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questions
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2answers
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Wrapper class to get pairs in range-for loop
This code implements a simple wrapper, intended to be used with range-for to manipulate items of a container as overlapping pairs, ie. 3 items will give 2 pairs.
Code review focus: Is ...
3
votes
1answer
58 views
A predicated version of std::for_each
For reasons, I want to implement a predicated version of std::for_each. I know that, in C++20, this is made somewhat redundant or less useful, as we can use ...
2
votes
1answer
44 views
Implementing a News Ticker
I implemented a console version of a news ticker and I will be glad for a code review. It takes a text from the user and displays it for a given period. How may I get it better?
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votes
2answers
672 views
IKM C++ assessment asks about std::unordered_set, part #1 [closed]
Recently I had to do an IKM C++ assessment to qualify for a job. Some of the questions seemed strange to me, so I'll be doing a few posts here to discuss.
The first one is related to use of std::...
2
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1answer
40 views
convert GCCRandom(Mersenne Twister by Takuji Nishimura and Makoto Matsumoto) to stl random
I am trying to translate the book Game Coding Complete by Mike McShaffry 4E to modern C++17 standard and faced with the code of Mersenne Twister by Takuji Nishimura and Makoto Matsumoto.
Is it right ...
3
votes
1answer
122 views
Remove indicies from vector
I am trying to optimise my remove-erase functions by using some attributes of C++ containers. This function should delete all indices defined in std::set form given vector. I am pretty sure that ...
6
votes
2answers
72 views
Insert into any sorted container
The following is my attempt to implement a insert_sorted() C++ function that accepts any sorted STL container and item and inserts it at the right position in the ...
3
votes
1answer
81 views
Function to use projections in legacy algorithms [closed]
I love the "projections" introduced by the ranges library, and I would like to use them in algorithms that haven't been rangeyfied yet.
I had the idea of using them through a function like ...
2
votes
1answer
188 views
std::vector Allocator-Aware Implementation
I've just finally finished implementing std::vector. I'm currently re-implementing whatever I can in the hope to learn more of how data structures works.
I tried to ...
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3answers
474 views
Generic Vector implemented in C language
I am on the way implementing my own STL-like library in C language. The main reasons are learning DS&A better, as well as the C language itself. Here I am trying to implement Vector (a.k.a. array-...
5
votes
2answers
327 views
Custom STL Vector container Implementation
For practice purposes, I reimplemented a STL Vector container. This container has most/all of the capabilities of STL vector.In my previous post, the reviewers made critical and concised observations ...
5
votes
1answer
383 views
C++ code for Priority Search Tree
I'm trying to implement a Priority Search Tree(PST) following this note: http://cs.brown.edu/courses/cs252/misc/resources/lectures/pdf/notes07.pdf. For convenience, ...
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votes
2answers
277 views
C++ Practice on STL templates and algorithms
I have implemented the following program below for an assignment for practice on STL templates and algorithms. All I'm doing is implementing the code for the printing of empty files, un-empty files, ...
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0answers
70 views
STL compatible Binary Search Tree with unique_ptr (unit test included)
I am trying to create a Binary Search Tree, which has STL support (iterators etc.). This is my first attempt. Everything is unit tested using Catch2. Could you please review what I missed and what I ...
1
vote
1answer
72 views
Implementing boost::upgrade_mutex using only standard locks
Is this my_upgrade_mutex class a valid implementation of boost::upgrade_mutex semantics? (Ignoring the ...
3
votes
1answer
38 views
An implementation of maximum subarray finding algorithm in STL style
I am reading Stroustrup now and I was very impressed with how flexible the STL library is thanks to iterators and generic programming. Along the way, I am also reading Cormen's book and decided to try ...
3
votes
1answer
80 views
Records and elements class, small "database" c++, no sql
I'm trying to construct a simple database for use by 2 persons only (myself and other guy), right now, we're using excel table with 4 fields "requisition, origin date, request date and authorized date"...
5
votes
1answer
190 views
Iterating over a tuple
I tried to write a small header-only library that provides a type similar to iterators for std::tuple as well as some STL-like algorithms. I would be grateful for ...
4
votes
3answers
389 views
SequencedMap which retains insertion order - Design#2
UPDATE: Current best state of a solution incorporating feedback and further development is in this answer.
Review on this Design#2 please:
Simple wrapper class template for ...
5
votes
1answer
1k views
Wrapper class template for std::map + std::list to provide a SequencedMap which retains insertion order
Review on this draft please: clang-8 -std=c++17
Simple wrapper class template for std::map & std::list (or alternatively std:unordered_map & std::vector) for the purpose of "retaining ...
3
votes
2answers
79 views
Average of subarrays of length k in C++
I took a crack at solving the problem of finding the averages of all subarrays of length k. Here is what I came up with. I would greatly appreciate your feedback on my code.
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4
votes
3answers
526 views
A custom String class implementation
This is my first implementation of a "container" using the Rule of Five, any feedback I'll gladly accept. I've tried to make it as Exception-Safe as possible. I've made it for an assignment.
Header
<...
2
votes
1answer
56 views
Merge adjacent occurrences of identical elements in data collection
There is a small programming exercise to merge adjacent identical elements in a collection.
Here are two solutions (passing the tests from the exercise).
I am asking for review of the first version ...
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2answers
235 views
YAAI (Yet another any implementation)
I am a C# game developer currently learning C++ and this is my second big-ish project (the first one being a vector implementation).
This time I opted for implementing a mot-a-mot ...
16
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2answers
313 views
YAVI (Yet another vector implementation)
I am a C# game developer currently learning C++. I am trying to implement some simplified STL containers. Here is my implementation of vector, which does not have the allocator (because ...
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votes
4answers
437 views
static_vector: a vector with stack storage
In many cases, we want a variable-size array like std::vector, but we know an upper limit on the size. In such cases, the vector can be allocated on the stack. We ...
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votes
1answer
460 views
A standard-conforming C++17 std::optional implementation
I took quite some time to implement a fully standard-conforming std::optional in C++17. It turns out more sophisticated than I initially thought. My code is just ...
8
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2answers
216 views
for_each_cons and for_each_slice, variants of std::for_each working on sliding windows
My goal was to replicate Ruby's each_cons and each_slice:
...
9
votes
1answer
5k views
Continuation Implementation in C++11
While playing with the concurrency features in C++11 I noticed that there wasn't any support for continuations. I wanted to develop something similar to Tasks in The Parallel Patterns Library (PPL), ...
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vote
1answer
1k views
Track execution time using std::chrono facilities and print the execution time in a comprehensible way
The class below will be used to track the execution time of various operations. There is no need to dip into C libraries to get formatted output then.
Output would be something like this:
10 ...
4
votes
2answers
246 views
Is_permutation() on sequence containers in O(n) complexity - follow-up
This question is a continuation of my previous question:
Check is_permutation on a pair of same sized arrays.
I improved the implementation to generalize for all sequence containers. Please let me ...
6
votes
1answer
2k views
STL-like palindrome checking
I just read this article on how to write a standard-like algorithm and wanted to try it myself by writing (as suggested in the article) an algorithm to test if a sequence given by two bidirectional ...
1
vote
0answers
65 views
A context-based partition_copy
I recently posted a question on Stack Overflow asking how I could go about implementing a context-based partition copy. I actually came up with my own solution, but I would like to see if it could be ...
14
votes
2answers
8k views
Fixed-size block allocator
I have written a fixed-size block allocator implementation and would like some feedback as to what I could improve in my code and coding practices. Your comments or notes are welcomed!
An auxiliary ...
2
votes
0answers
781 views
Max independent set of a sequence
This is the code I've written to find the maximum-weight independent set of a graph path. It's a standard problem with a well-known dynamic programming solution of linear complexity. Since it's a ...
3
votes
1answer
18k views
Multiply vector elements by a scalar value using STL and templates
I wrote a small scientific simulation where I wanted to manipulate vectors with the same kind of functionality that Python's NumPy vectors use. Namely, I wanted to be able to add vectors together, ...
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votes
5answers
1k views
Simple server to manipulate priority queues
In a few months I'll work on a C++ project that could span a year or two. I've a strong C background and for the usual reasons I always chose C over C++ (please forgive me). To extend my capabilities ...
12
votes
2answers
1k views
Object storing and retrieving using wildcard identifier
I'm writing an interpreter for a scripting language which allows objects to:
Have an alias
Be referenced using a wildcard
Contain child objects
Combination of all three above
For example:
...
1
vote
0answers
139 views
Enum list to STL container, part 2
Original question:
Enum list to STL container
Goal: Write a function enumToSTLContainer() that is to return any STL container whose elements are from a specified <...
2
votes
1answer
2k views
Enum list to STL container
Can someone improve upon this function of mine? EnumToSTLContainer is supposed to make a copy of any STL container whose elements are from a specified ...
6
votes
4answers
1k views
Counting word occurences
This is a simple word count program I wrote to play around and get familiar with using std::map. Is there anything I can improve upon?
I didn't use CTRL+Z to stop ...
5
votes
3answers
1k views
"Jolly Jumper" challenge
I'm a C#/Java full-time developer who is trying to pick up C++ purely for educational reasons. I've tried to solve a pretty simple ACM ICPC problem and would love to hear all kinds of criticisms on ...
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votes
2answers
19k views
STL List Implementation
I've implemented a simple C++ STL like list. It's pretty simple, all the constructors and methods haven't been implemented here, but majors are.
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6
votes
2answers
2k views
Using includes() vs. hash function to check if an unordered_set is a subset of another unordered_set
I did two methods to determine if an unordered_set is a subset of another unordered_set, using hashing, and the built-in ...
4
votes
1answer
138 views
Container which iterates a range or a list
I have made some composited container Range which accepts either a min/max range as a std::pair or a set of integers as a ...
2
votes
1answer
3k views
Filter a collection
In my project, there are some methods which filter some items from a collection. I was told to use the C++ STL whenever I can. But when I use std::copy_if, I feel ...
2
votes
1answer
174 views
LRU Cache with a static variable for garbage value
I have tried to implement a Least Recently Used cache with only C++ STL containers. The main thing that I keep asking my self the static variable called garbage_val....
6
votes
2answers
427 views
STL-compliant list class
This is my first attempt to create an STL-compliant container. I'd like to know whether it meets STL concepts & requirements, so feel free to critique.
list.h
...
15
votes
2answers
18k views
Implementation of binary heap in C++
Things I can think of include integer overflow, if the input type is int, etc. But other than that, what do you think is wrong with this code, design-wise, style-wise, and also in terms of other edge/...
6
votes
2answers
1k views
Box-stacking problem in C++
I have tried to write code of Box stacking problem (mentioned here) in C++ .
Kindly give me some views on what mistakes I might have made and how I can improve.
It is running for the two inputs I have ...
