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General C++ Programming - April 2021

How do i write the code for balanced array...URGENT please

An array with an odd number of elements is said to be balanced if all elements (except the middle one) are strictly greater than the value of the middle element...

[13 replies] Last: To be honest, I have no idea. He says it works, though. I have sugge... (by JRManx)

by steball

Using CImg to creat 3D object and export to .stl file

I have a 15 year old boy that got a job last summer so that he could buy himself a 3d-printer. He just recently got his second, with conveyor belt. My 12 b...

[1 reply] : Funny, there was just another thread talking about stl files as well. ... (by Ganado)

by wk10dn29

having trouble with my hw for stl file

* separate compilation Cube.hh Cube.cc Cylinder.hh Cylinder.cc optional: Sphere.hh Sphere.cc Drawing.cc Drawing.hh */ #include "Cube.hh" #include "C...

[6 replies] Last: Forgot to give a reply earlier. I'm kind of just winging this, but you... (by Ganado)

by coldscooter

Including/using <regex> will not run on some machines?

I am creating a dll which gets loaded by a game engine. It runs fine on my dev machine, however does not on a secondary machine (it will not bind when the engi...

[2 replies] Last: Unfortunately I don't get to see any error message, as I only have the... (by coldscooter)

by sergelac

thread_local std::vector error

C++ Builder XE4 this code give the error E2461 'TempOptions' requires run-time initialization/finalization static __thread std::vector <int> TempOptions; ...

[3 replies] Last: C++ Builder even if it is the latest version (XE4 is from 2013) isn't ... (by deleted account xyzzy)

by pieterdehoogd

Greedy algorithm to fill 2d array

Hello, can someone help me with the following problem: Is there a way to write a greedy algorithm that fills a 2d array with numbers? Array array is empty (...

[10 replies] Last: Well here were are, 11 messages into the thread and the OP still won't... (by dhayden)

by onetwo12

split string S

How can I split string S into substring S ? Also substring S should set some number a . Should I use strtok to split the string?

[13 replies] Last: cut one segment into two and pay for this a price equal to its length ... (by jonnin)

by juicypwner

Converting struct to class? xxx is private within this context

Not sure how to alleviate this issue (see title). I went ahead and was in the process (not finished I assume due to the error) of revamping a program that used ...

[3 replies] Last: If the 0-arg Product constructor must be private, then don't call it. ... (by Ganado)

by bassel27

How to access instance variable value?

I created n objects from the Stock class and assigned a value for the integer instance variable expectancy. This value is different for each object (stock). I w...

[6 replies] Last: vector<Stock> shares( n ); ... ... sort( shares.begin(), shares.end()... (by lastchance)

by CVRIV

Having trouble comparing \r and \n from a text file.

I'm having the weirdest issue. I'm trying to count characters in a text file, while excluding \r and \n. I opened the file in binary mode. If I use Char == ...

[2 replies] Last: Yea.... I figured this out hours ago. I should of deleted this thread ... (by CVRIV)

by phazed99

Nested class/Double-linked list confusion

Hi everyone, we were provided all the following code and told to write the addLongInt() function. We are supposed to be adding numbers using a double-linked lis...

[7 replies] Last: There is still a lot I have to learn. Compare your approach to my c... (by seeplus)

by Kallinteris Andreas

Do custom allocator apply just to containers, and how do i apply them to any memory allocation

https://en.cppreference.com/w/cpp/named_req/Allocator I am referring to this ^^^^ kinds of custom of memory allocator (if there is a different kind of alloca...

[6 replies] Last: There's no point in aligning the vector. (by mbozzi)

by ainsley1006

Log File Wrap Over Failing

Hi All, I'm having an issue with my app at midnight when it's meant to start writing to a new log file. I've created this demo app (spooling a new file every m...

[6 replies] Last: GCC, for instance, will only warn on shadowing if you explicitly enab... (by MikeyBoy)

by mjjm1442

destructor called after calling constructor

By looking at the example: #include <iostream> int wow=0; class Foo{ int cow = 0; public: Foo(){ std::cout << "Foo +\n"; cow = 0; ++wow; } ...

[7 replies] Last: Okay I already get it. Thanks for your help. (by mjjm1442)

by brharding1

Array of Structures Memory Issue

In my main function, I create an array of structures which stores cache information i.e. dirty bit (bool), valid bit (bool), tag (string), data (string), and ag...

[2 replies] Last: It would help to see the code that's calling the function. How certai... (by MikeyBoy)

by Kallinteris Andreas

should i use static constexpr instead #define () and naming convection (1,2)

in good old c we used to just have #define SOME_GLOB_CONSTANT 5 but now days we also have const int SOME_LOCAL_CONST = 5; class class_name { ... stati...

[30 replies] Last: Experimenting is fine. There's lots of existing code that uses macros ... (by seeplus)

by Sunnycoder

for loop question

hi , so this is the question just very confused how to start and end , also please explain me what every line does thank you input 2 output # #**# (What I h...

[7 replies] Last: try to break it down into something simpler that is easy to do. This... (by keskiverto)

by RicoJ

"Empty" std::thread is not moved properly?

Here by "empty std::thread" means a std::thread object with "no thread of execution" According to cpp reference, that alose means "a new thread object which do...

[3 replies] Last: Hi guys, What is the point of your code? Why are you trying to mov... (by RicoJ)

by Darth Nzt42

configuring compilers

I've installed Codeblocks and tried to configure the mingw compiler that I downloaded.. But codeblocks can't find it. Is there any IDE available that doesn'...

[2 replies] Last: There is a C::B download that has a C/C++ compiler already set up for ... (by deleted account xyzzy)

by Kallinteris Andreas

std::priority_queue<std::vector> how to reserve space in the internal vector container

I am trying to performance optimize some code and I want to observe the effect of reserving space on queue I have a priority queue (https://en.cppreference.com...

[4 replies] Last: I ended up going with boost::heap::priority_queue which (at least for ... (by Kallinteris Andreas)

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