General C++ Programming - C++ Forum

overloading class method in virtual class situation

I am having difficulty overloading a class method.... I am programming a data collection system. I have an interface class, a base class, and then inherite...

[18 replies] Last: Thanks again. I needed to just adjust some of my platformio.ini setti... (by PeteDD)

by Worldtreeboy

does c++ getline reads empty line as \n?

I realized when there are many blank line inside a txt file and I use getline inside a file with many blank line it will read the blank line into the string. ...

[7 replies] Last: There is also istream::getline() which is a member function for istrea... (by seeplus)

by deleted account xyzzy

C++20's std::format is so picky

Well, Visual Studio 2022's implementation of std::format is picky. The following compiles without even a twitch: import <iostream>; import <format>; in...

[18 replies] Last: Heh, the C++20 One Ranges Proposal (P0896R4) has a rather amusing prea... (by deleted account xyzzy)

by denver2020

python to c++ converter

I am looking for python to c++ converters. Any free tools available?

[18 replies] Last: Having written numerous translators, I would suggest that C is a bette... (by AbstractionAnon)

by kigar64551

Detect the "order" (arrangement) of an array

Suppose you have an array of length n , containing some "random" numbers. There are n! possible orders in which these numbers can be arranged. For example, i...

[6 replies] Last: Actually, @kigar64551, I've just realised that my approach is essentia... (by lastchance)

by nvthielen

c++ api32 dispplayDialog

hallo, C++(ers) I have a problem after making the main int window. the I wane whit a pus of a a button display a other window but is don't show up. LRESULT ...

[3 replies] Last: is ok now the window Class name was not Correctly spelled h... (by nvthielen)

by JamieAl

Error using large Eigen matrix: " OBJECT_ALLOCATED_ON_STACK_IS_TOO_BIG"

I have been using Eigen matrices to test a new code I wrote, and I just ran into this issue for the first time. I just started reading about "Fixed vs. Dynamic ...

[5 replies] Last: Thanks everyone!! Using Matrix<double,Dynamic,Dynamic> X(ny+1,nx); o... (by JamieAl)

by JUANDENT

concept : yielding function pointer by using the plus trick

Hi, I have this code /** * Constraints a deleter to be or to yield a function pointer. */ template<typename D> conc...

[8 replies] Last: https://developercommunity.visualstudio.com/t/Internal-compiler-error:... (by JUANDENT)

by AbstractionAnon

Visual Studio 2022 Issue

When I try to create a new project, Visual Studio is picking up a totally unrelated source directory. 1. Create New Project 2. Select empty console projec...

[5 replies] Last: @ElusiveTau: OLDPROJ was NOT a member of the solution. Yes, I got the ... (by AbstractionAnon)

by denver2020

tree reversal

I am trying to write a recursive function that reverse the actual tree by modifying it rather than creating another one. Below is my code so far. Below is e...

[9 replies] Last: Thanks a lot seeplus. This thread is solved and I am closing it. Thank... (by denver2020)

by Worldtreeboy

how does argument get passed to function name

#include <iostream> #include <array> #include <algorithm> #include <iterator> using namespace std; void timesTwo(int i) { cout << i * 2 << " "; } int ...

[13 replies] Last: very clear explanation. thank you (by Worldtreeboy)

by t im

About the constructor function.

Just take std::vector as an example. I wonder which constructor function is called when executing std::vector<int> a{1,2,3}. Thanks for your help.

[4 replies] Last: Thanks for all answers. I have got it. (by t im)

by ruzip

Convert Pointer &p to Integer and Back

What is a valid conversion from pointer (&p) to integer and back? Do I just do a cast? or just the same as Int to Pointer and use the & when needed?

[9 replies] Last: C99: If the implementation provides intptr_t and/or uintptr_t , the... (by JLBorges)

by frek

Array exercise

The exercise says: A non-empty array A consisting of N integers is given. A triplet (X, Y, Z), such that 0 ≤ X < Y < Z < N, is called a double slice. The sum...

[7 replies] Last: @frek, The easiest way to generate tests for your algorithm in this in... (by lastchance)

by Hawlong

Internal memory reading

I am trying to get the health of the player, and i have address (green address) and Offset , How can read this address? (Internal = dll inject) .

[4 replies] Last: I believe the aim is to create a handler in a DLL, then attach it to t... (by kbw)

by gabriel11

isalpha() skips a non-alphabetic character if there is no space in front of it.

Hey guys. I'm making a simple SQLite compiler via C/C++ and all is going well, except for the isalpha() function. How the keyword tokenizer works, is that it...

[15 replies] Last: else if(isalpha( this->c )) { this->temp.clear(); ... (by dhayden)

by JamieAl

Error Eigen: THIS_COEFFICIENT_ACCESSOR_TAKING_ONE_ACCESS_IS_ONLY_FOR_EXPRESSIONS_ALLOWING_LINEAR_ACCESS

I have an iterative solver that works fine in a main script and when I move it to a function things run fine until it hits a specific line where I get the error...

[3 replies] Last: @helios I would guess it's because the type of L and the type of di... (by JamieAl)

by Worldtreeboy

Writing data to random access file

If a random access file is 3000 byte and i use the ostream seekp function to place the file position pointer at the 500th byte and then use ostream write func...

[6 replies] Last: Yes - I'd just read the whole file into a std::string, manipulate as r... (by seeplus)

by Bubbles0012

Having problems on the output

Hello, I have this code but I am having problem with the output as it keeps getting out of the grid order and is not outputting all the words. #include <iostre...

[3 replies] Last: And to finish it off with assigning random chars to to unused elements... (by seeplus)

by Cambalinho

C++: how avoid draw outside the view?

here my code for draw a polygon: position GetLineZZero(position Origin, position Destination) { position LinePoint; RECT fd; GetClientRect(Get...

[1 reply] : what is the actual value? Your logic is coded so it will fail the con... (by jonnin)

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General C++ Programming - August 2022