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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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
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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
107 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
62 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 ...
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1answer
61 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
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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
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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
81 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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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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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
57 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
100 views

dc.js and crossfilter app to display multiple charts

Consider the following crossfilter / dc.js app (screenshot): ...
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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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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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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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54 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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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
123 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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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
233 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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1answer
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Smart pointer like implementations

For educational purposes I implemented standard library smart pointers like class templates. They are definitely not a full replacement for the library classes but I'd like to get some comments on the ...
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1answer
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Generate a text file representing an email for a job application followup

Purpose: After you've submitted a resume and cover letter for a job position, you haven't heard anything back, so you decided to send a follow up email. The script generates the follow up e-mail based ...
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Insertion Sort and Selection Sort Implementation

I wanted to practice using templates since I have no experience with them, so I implemented these sorting algorithms. Selection Sort: ...
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Optimizing Datatables table of tens of thousands of client-provided rows

We have this employees table, that looks like this: that contains 16,530 employee rows. As expected, this table takes more than 30 seconds to load. I have been tasked with speeding it up somehow. ...
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1answer
60 views

Loop over whole array starting from any index

I recently had to repeatedly iterate over an array but increment the index to start from each time. Since this is quite cumbersome in comparison to a normal for loop I made a small template function ...
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1answer
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Implementation of static_vector using an array of std::aligned_storage, with std::launder and forwarding

I'm trying to expand on the implementation of static_vector on the std::aligned_storage reference page, but would like to split it into two parts. First, an ...
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131 views

Simple Matrix Template Class

I wanted to make a matrix template class to see if I can learn how to use templates, work on figuring out the indexing in loops, and making an interface so the user can know if an operation will work. ...
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Displaying Singapore bus arrival times using a Go template

I am wondering whether my template usage in main.go could be better. For example in other code I notice: ...
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Observer(Event) system (Signals and Slots), type and template based

Signals are represented as types. You can connect a member function of some instance to the Observer system. This connected function will be called whenever a signal of a type that is the same type as ...
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Tracker for object construction, copy, and movement

I made an object tracker for debugging and testing purposes called ccm_counter (construction, copy, move counter). It counts constructor, copy and move calls. It ...
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1answer
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Injecting a set of files in a Thymeleaf template while keeping the amount of tags at a minimum

I use a Thymeleaf template to inject a set of files (which contain precalculated HTML) into one big HTML. The files with their metadata are stored in a map called ...
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vb.net Create textfile from template

What is the best approach for creating textfiles from/with a template ? Currently I just read the template from a textfile and Replace all values needed, but I don't think that this is the most solid ...
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1answer
62 views

Simple template engine in PHP

I tried writing my very first template engine today. I designed it to just replace variables in templates, and keep it basic for now. Can anyone give me some constructive criticism? I'm getting ...
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2answers
101 views

add_const or remove_const based on another type

Here is a type trait which - I feel - could fit in std next to std::add_const and ...
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2answers
148 views

C++ wrapper class to mimic a C array's brace initialization

I have an inheritance class that mimics the behavior of C style array's brace initialization by using a class template that has a variadic constructor but the template itself is not a variadic ...
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1answer
101 views

Template matrix class, second version

This is my first matrix class which I updated after already asking here already. The updated code is below. Are there any suggestions regarding member function parameters? Is there a convenient ...
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318 views

First template class - Matrix functions

This post has been answered and updated. This was the first time I've ever written a template class. I've spent probably a bunch of times re-writing matrix code for different types, different ...
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1answer
109 views

A basic multi-dimensional array

I have been lurking on the C++ side of stack-overflow only long enough to know there are a lot of beginners and intermediate programmers baffled by multi-dimensional arrays. I've seen a lot of ...
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1answer
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C++ math vector template

I wrote a basic template for a vector of arbitrary dimension to be used in a 3D-engine. Most operators make use of C++ template meta programming and instances are implicitly convertible to glm types. ...
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C++ Vector with templates

I am learning about templates in C++ so I decided to implement an N-dimensional vector. The code seems to work fine, but there are a few things that I am unsure about. To stop ...
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2answers
117 views

Templated string formatting

This function formats a string by replacing every occurrence of '{n}' with the corresponding argument that was passed to the function where n is an index that ...
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1answer
259 views

C++ - Trie Implementation

I am trying to learn trie and this is my first implementation. I started off with the idea of being able to handle different data types for key and value; however, I found the data structure a bit ...
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1answer
99 views

Synchronized template wrapper class

Issue: Code base has lots of data structures which are accessed between threads with >= 1 writer. Application logic becomes obfuscated due to lots of mutex locks. Solution: Create a template ...
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1answer
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PHP simple template loader

This is not really a question but I'd like to obtain some opinions about this simple class. For an old project I had the necessity to load some php template files that includes some ...
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1answer
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Is this a good/bad/ugly way of assigning unique IDs to objects in C++? [closed]

My project has many different objects from different classes, and I want each object to have a unique ID. IDs should be unique within each class type, but can be the same among different classes. For ...
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A simple and efficient packet frame encoder/decoder

I have written a simple packet-framing class, for converting un-encoded 'packets' into encoded/delimited 'frames,' to be sent over a P2P serial connection. The functionality is based on the RFC 1662 "...
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2answers
423 views

Doubly linked list std::unique_ptr template class implementation

Inspired by the talk of Herb Sutter in CppCon2016, I decided to make a doubly linked list using templates, smart pointers, and raw pointers (for back-pointers, having a cycle of ...
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2answers
392 views

Small Formatting Library

I am learning C++ and currently playing with variadic template functions and formatting string, So here is my small attempt to write a formatting function and provide a simple iostream-like interface ...
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1answer
542 views

Generic Producer-Consumer in C++11

I wrote the following simple 1 producer - 1 consumer problem, in attempt to learn some C++11 threading / generics. ...