Questions tagged [template]

a design structure for creating several things that are almost identical but need different values. Not template-meta-programming.

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Union find using unordered map and templates in C++

I tried to implement union find (disjoint set data structure) algorithm in C++. There I used unordered_map data structure. Is there a better way of doing this using any other data structure. While ...
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1answer
69 views

Implementation of a vector of pairs

In a personal project I was working on, I had a vector of std::vector< std::pair<unsigned,char>>'s that represented a character and its position in the ...
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Custom template system with introspection in Perl

I know I never have to reinvent the wheel, but I did, because I need speed performance, also I need this features: introspection or metaprogramming actuate like api backend private variables ...
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1answer
1k views

C++ Template to implement the Factory Pattern

Design A template class that will create a concrete instance of an interface class when given the name (as a string) of the concrete class. This design is often seen in code, so the purpose of this ...
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3answers
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Copy and in-place transformation of strings to lowercase/uppercase

I have the following code that transforms a string to upper/lowercase: ...
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2answers
780 views

Publisher Subscriber Pattern Template

This is the first time that I have tried programming in such a general way using c++. I have tackled this pattern before in other languages such as ...
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2answers
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What changes should I implement in my templated sorter class so that it performs efficiently?

I have a college assignment to implement a class called sorter, whose object is a sorted vector (the user is allowed to sort it by the method he/she desires). I have been able to implement it as ...
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1answer
191 views

`zip` operator to iterate on multiple container in a sign

I worked out a zip operator similar to Python's, because I didn't find one in std. It allows to use range-based ...
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1answer
81 views

template iterable numeric range class with multiple min/max inclusion modes

Problem my code solves: Lack of lightweight numeric range classes which can tell if arbitrary values lie inside them, supporting more than just simple exclusive max modes and integers, and that ...
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Python class for helping template SQL queries when working with psycopg2

While working on a project to do some spatial data processing in PostgreSQL, I found it cumbersome to use the psycopg2.sql objects to safely compose queries. I ...
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2answers
104 views

Lock-free multi producer logging/profiling, multi file descriptors

I am developing (for fun) a Utilities & Logging library Can someone please help me to improve: Github link Pros Thread-safe, no mutex. Use lock-free ring buffer (the idea is inherited from ...
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1answer
135 views

Minimal Property system in c++17

So I needed to represent by objects in terms in ini format and change their values from the ini as well, so I thought why don't implement a property system for this. I want it to be bit fast so I ...
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3answers
677 views

Template Matrix Class: implemented some basic functionalities

Basically I have written a matrix class for addition, multiplication and scalar multiplication. I need your review of the class implementation below in terms of efficiency, memory consumption and new ...
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2answers
60 views

Class template, custom container

So I wrote this class template for a custom container. Basically, it stores elements and their occurences. When an element is pushed into the container, if it ...
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1answer
78 views

Serializable and extensible API implementing the Command Design Pattern

I am currently trying to implement an extensible way to create commands that can be sent to some type of executor. In my case, there would be two of them (server and client). As I posted here, I had a ...
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1answer
112 views

abstract base classes versus the curiously recurring template pattern [closed]

Background Apologies for "burying the lead." The questions are in the next section. In my application, the purpose of inheritance is to abstract away complicated logic in the base class template, so ...
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3answers
1k views

Binary Search Tree Using Templates in C++

I have made this BST using templates Node.h ...
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1answer
69 views

usart driver wrapper

Could you review my usart driver wrapper please? It contains the C language Xilinx usart driver, but I write C++ programs and need to C++ usart driver. How it was designed correctly and what I have ...
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0answers
78 views

Enables markup to instantiate objects, call methods, and generate HTML

I created this package PXP. PXP enables markup to instantiate objects, call methods, and generate HTML. It works similar to a server-side templating engine, but rather than enforcing braces it ...
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141 views

Implementation of container searchable by any element

Writing game engine as a hobby, I've come across many situations where I need a container like a map, but searchable by different keys: a block allocator where a block needs to be searched by either ...
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75 views

Compile time logical operations for web framework in C++

I'm working on a web framework in C++ and there's this part that I need to do something like this: ...
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116 views

Python Project Template

What's up smart people. A little backstory for context: I'm a completely self taught dev, and the only person ever looking at my code for the past 6 years is myself. I realize that's not the best idea ...
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2answers
225 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 ...
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Angular forms - reactive vs. [(ngModel)]

I am developing this angular app and it has big forms with 100 + fields. I was thinking about using [(ngModel)] without reactive forms, so that it's easier to do ...
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304 views

Reference enum values in Angular template without aliasing the enum type

Is there a way to improve this code? I'd like to use the enum type PaymentMethoddirectly in the angular template without renaming it to ...
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2answers
300 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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1answer
123 views

C++ Linked List Template Implementation, Howto Default Compare Function, and Split?

To better learn templates, I have dabbled with a simple linked list implementing the class with a private member compare function (cmp) that is used when adding ...
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0answers
163 views

Javascript + php system for reusable HTML templates

I have many pieces of HTML code that are used in many parts of the website (controlled by javascript), like edit forms and dialogs. Instead of include-ing the html ...
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2answers
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`printf` improvement with C++ variadic templates

I am currently working through learning C++'s variadic templates and I wanted to create an example use of them that is less trivial than the one in my book. I decided to create a modification of ...
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72 views

Helper to convert arbitrary function into a custom deleter

If you want to use a custom deleter in unique_ptr you either have to pass a functor or the signature of a delete function as template argument. If you have a ...
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2answers
198 views

basic jQuery plugin template

I would like to know if I'm writing a plugin for jquery correctly. I followed the official guide and also added some tweaks that I've found from various sources over time. While this works perfectly, ...
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1answer
118 views

Email Generator

I've made a email generator, that uses a HTML template and replaces keywords in the template with information taken from a database. I'm looking to see if there is a way to improve the coding. ...
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1answer
79 views

Predefined values for some values in a template function like with a #define macro (e.g. template<int foo, typename bar>)

I want to overload an operator (e.g. operator<<) with different types, but also change only 1 or 2 values in the function itself. I want to get some fancy output of a vector with the primitive ...
4
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1answer
99 views

A Versatile Algebraic Variable Class Template with full operator support

I've been working on this concept for the past few days where a variable_t is of any type T; assuming that it is at least ...
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1answer
159 views

C++ wrapper around uniform mt19937 SequenceContainer [closed]

With the following interface in mind EasyRandom<unsigned int> prng(a, b); auto x = prng(); // scalar auto v = prng(10); // vector I wrote the following ...
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1answer
104 views

Emulating Virtual Registers Part 3

Forward This is a continuation of my work in progress and the last iteration that I posted can be found here. I have designed a compact class template that uses SFINAE with constructor delegation to ...
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1answer
174 views

Elevation to power function using class templates

I attached below a small working example of a function that is able to perform x^y. As it is possible to see the base (x) takes ...
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Emulating Virtual Registers Part 2

This is a follow up of my original question in which I'd still like to have some answers, opinions etc. but after looking through some of the standard library's features I have come across ...
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101 views

Emulating Virtual Registers by experimenting with unions, bitfields, structs and template specialization

To get a better handle and understanding of how bitfields, unions, and the byte alignment of structures work, I'm simulating a template Register structure. The requirements of my Register are as ...
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2answers
184 views

Detecting if an element is found inside a container

I just wrote this template to detect if a given element is found inside a container: ...
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1answer
211 views

Replacing MIN and MAX macros with type-safe, recursive templates of variable arity

I'm currently reading Mastering Perl for Bioinformatics; I'm using the book for learning bioinformatics while implementing the code in C++. I came across a situation where I needed to use the minimum ...
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1answer
518 views

dc.js and crossfilter app to display multiple charts

Consider the following crossfilter / dc.js app (screenshot): ...
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57 views

Generic Variable Elimination with multiple entry points

I have this algorithm, called Variable Elimination, which is used quite often in my code-base (library). It is an algorithm for factor graphs (a type of bipartite graphs), used to efficiently maximize ...
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1answer
261 views

Simple bash script creates apache2 virtualhost config for subdomain

Simple bash script to create apache2 virtualhost for localhost. Can be used for public subdomains on developer server with changes - "replace .localhost". Tested on Ubuntu, but should work where ...
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2answers
488 views

C++ Pixel/Array manipulation libs

I was tired to always perform pixel manipulation one by one, so I started to create my own templated header to perform computation over pixel (RGB, or RGBA), but I also make it for ND for some cases. ...
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56 views

Simple dynamic array template

For my game engine I needed a simple templated array class that can be safely passed across module boundaries. It's not supposed to be a replacement for std::vector and thus doesn't need all of its ...
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0answers
58 views

Value-To-Type Map

Context For one of my projects I have to use a library which works similarly to the following code : ...
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1answer
329 views

Calculating array size in C++

This code shows two ways to calculate size of array of any type. I would like to know, which should be preferred? Is there any advantage/disadvantage? ...
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36 views

Templated JSON parsing methods that work with an element or elements array

Consider the following two Java methods. The first takes a JSON string representing one element, the second representing multiple elements. gson.fromJson() can be ...
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1answer
258 views

Variadic Datablocks

I would like to have my variadic template class reviewed. First some explanation what it should do: I'm writing an application where I read in blocks of data. I know before i read in the data which ...

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