please wait
|
by admin
Welcome to this board!
|
| Welcome to the general programming forum in C++.com! In this forum, users can to talk about any topic related to programming in the C++ language that does not ... |
|
Jan 14, 2008 at 1:17pm
[no replies]
|
|
by kitfox
How to create white noise random hashing function?
|
| I'm trying to figure out how to build a random hashing function that emphasizes speed and repeatability. Basically, for input it will have an unsigned int seed... |
|
Apr 28, 2025 at 8:21am
[1 reply] : I think you can use any proper hash function to produce a (pseudo) "... (by kigar64551)
|
|
by Heyyo53
PNG File Reader (1,2)
|
| I have been on a quest to write some kind of PNG file reader, mostly just for myself, and I was wondering if there is any good resources on how to do binary fil... |
|
Apr 28, 2025 at 6:19am
[29 replies] Last: Hey, welcome back! 1. How does your code handle cases where the rati... (by Duthomhas)
|
|
by Xaxazak
discussion on std::ranges::iterator_t<T> being distinct from T::iterator (and same for begin)
|
| I recently spent an hour or so on a bug that came down to std::ranges::const_iterator_t<T> sometimes being different from T::const_iterator. For example: === s... |
|
Apr 26, 2025 at 12:36am
[no replies]
|
|
by bistelA0005
Use C++ 20 with Embarcadero
|
| I have been using C++ builder for some C projects. It works really well. However, I have been trying to run some code from a tutorial I want to follow and I get... |
|
Mar 18, 2025 at 3:36am
[4 replies] Last: The last recourse is the "other compiler options" where you can just l... (by salem c)
|
| Call of Templated Function w/ Explicit Template Argument Fails to Compile |
| greetings kind regards may i please enquire why compiler reports error for code below as indicated . thank you kindly template<typename T, typename U> voi... |
|
Mar 15, 2025 at 10:20pm
[1 reply] : The meaning of the name _T.aaa depends on the template parameter T ... (by mbozzi)
|
|
by PhysicsIsFun
scientific computing - optimize speed
|
| Greetings, this is a longer thread, so thank you in advance for anyone who takes the time. It might be that no one can help me without sharing the whole github... |
|
Mar 7, 2025 at 8:53am
[16 replies] Last: Just leaving this here. https://en.wikipedia.org/wiki/Barnes%E2%80%93... (by salem c)
|
|
by stonedviper
why can't I use cout with without iostream
|
| Basically what the tittle says I wanted to output something so I only included the ostream library but when I tried to output something with cout i saw ... |
|
Mar 6, 2025 at 3:48pm
[5 replies] Last: And then there is <iosfwd> (by keskiverto)
|
|
by PhysicsIsFun
Pybind11 slows my C++ code substantially
|
| Greetings everyone, continuing with my particle simulation, I am trying to turn it into a python package (I work in maths, and most people would never be able ... |
|
Feb 6, 2025 at 11:02am
[4 replies] Last: of course it can. you may need to hand wave at byte ordering if you g... (by jonnin)
|
|
by leo2008
anagram using vector
|
| I am trying to solve this problem. Are there any other better approaches here? Implement a function which takes a list of words as an argument and finds all a... |
|
Dec 5, 2024 at 1:32pm
[2 replies] Last: If you go big (a large dictionary of words) you may want to move out t... (by jonnin)
|
|
by JUANDENT
Making a shared_ptr out of a stack object corrupts the heap!!
|
| Hi, The following code is incorrect: Customer customer = { 0, "John Doe", "johndoe@example.com" }; auto cc = std::make_shared<Customer>(customer);... |
|
Nov 20, 2024 at 1:05pm
[2 replies] Last: Note: std::make_shared<T>() creates a new heap-allocated instance of... (by kigar64551)
|
|
by JamieAl
Testing restart functionality in C/C++
|
| Hello! I am trying to implement "restart" functionality in my code, where if for some reason the code stops (i.e. iterations drop) I can pick up from where I s... |
|
Nov 16, 2024 at 9:28pm
[1 reply] : you will get more help if you put it in a repo where we can see the co... (by jonnin)
|
|
by JUANDENT
Need a data structure where I can map a string to a type
|
| Hi, Need a certain compile time map m like this: using Type = typename m["Customer"]::type; // Type would be Customer How can i do this? Regar... |
|
Nov 12, 2024 at 9:03am
[10 replies] Last: It's not necessary to use an enum. It was just a suggestion. (by Peter87)
|
|
by Coubarrie
Save to file with vector (dynamically)
|
| I have created a programme that does calculations and generates results from those calculations. The imformation generated is stored in variables for later d... |
|
Nov 9, 2024 at 6:28pm
[11 replies] Last: i outside the loop is not a c++ error. It is a questionable programmi... (by jonnin)
|
|
by JUANDENT
what does T = 0 mean in a template parameter?
|
| What does T = 0 mean in the following code: template<typename T, T = 0> T moduloOf(T a, T b) { return a % b; } |
|
Oct 31, 2024 at 11:08am
[4 replies] Last: Indeed: "initialized with value 0" limit what type the T can be? (by JUANDENT)
|
|
by LsDefect
When does early binding happen?
|
| Thing 1: Static binding takes place during compilation - function calls are replaced with an instruction saying "go here for the appropriate function definit... |
|
Oct 18, 2024 at 7:21am
[1 reply] : I guess this is what's called "devirtualization" which GCC has optimiz... (by Peter87)
|
|
by Cyclone
Would like some testers please
|
| Sorry is this is the wrong forum. If possible I would like someone to try out my program. It works for me but I want to know if it works for other people. ... |
|
Oct 17, 2024 at 4:29pm
[10 replies] Last: There's a special GitHub repo set up to make it easy to learn how to f... (by deleted account xyzzy)
|
|
by JUANDENT
_Safe_add checks for overflow but does not do anything to report the problem!
|
| Looking at VC++ source files I find in ratio the following: what is the purpose of _Safe_add_integer_arithmetic_overflow_error? inline void _Safe... |
|
Oct 9, 2024 at 2:04pm
[5 replies] Last: Neat example, thanks. (by Ganado)
|
|
by TheIdeasMan
templates class friends strong types
|
| Hello all, first a bit of background. Land Surveying involves many types of: Angles, Bearings; Distances; Co-ordinates; and there are many types adjustments ... |
|
Oct 3, 2024 at 10:02pm
[8 replies] Last: I read Jonathon Boccara's blog That article is from 2016, C++20's co... (by deleted account xyzzy)
|
|
by JUANDENT
unresolved external symbol "int const value"
|
| One file states: extern const int value; extern const int this_cpp; const int mine = value; const int yours = 40; and another cpp states co... |
|
Sep 22, 2024 at 4:52pm
[1 reply] : Your other.cpp file also needs to say extern, otherwise it's taken to ... (by salem c)
|