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CPP QUESTIONS

Separating big number to digits c++?
Separating big number to digits c++?
wish of those help First of all, activate your compiler's warnings. On gcc and clang, -Wall -Wextra -Werror do the trick.Secondly, if you call convert_to_digits(1234567890123456789012,22) on a platform where 1234567890123456789012 is too big for a lo
TAG : cpp
Date : November 06 2020, 03:59 AM , By : Vikash
Create Child window on windows API
Create Child window on windows API
I think the issue was by ths following , I'm trying to add a child window to my main window, but the function CreatWindow is thrwoing an exception saying that can't access address at 0x00000, but it works fine when i try to create a button, i tracked
TAG : cpp
Date : November 05 2020, 07:07 PM , By : Zakir Hussain Baloch
Guard against type violations in non type template parameters
Guard against type violations in non type template parameters
Any of those help This is actually a GCC bug, as there should be a diagnostic(warning or error) for narrowing here. The bug report is Narrowing conversions not caught in non-type template parameters and it has the following example:
TAG : cpp
Date : November 05 2020, 07:07 PM , By : sagarika
Quick Sort - Middle Pivot implementation strange behaviour
Quick Sort - Middle Pivot implementation strange behaviour
To fix this issue The issue is using a[pivot] rather than setting pivot = a[left + (right - left)/2]. Your version with this fix:
TAG : cpp
Date : November 05 2020, 07:07 PM , By : cool yang
Integrating jsoncpp by including amalgamated source in Xcode
Integrating jsoncpp by including amalgamated source in Xcode
Hope that helps I found that it works if json/json.h, json/json-forward.h and jsoncpp.cpp are copied to the project directory. jsoncpp.cpp is added as a source file and json/json.h as a header. However, NO additional header search paths are set.
TAG : cpp
Date : November 05 2020, 07:07 PM , By : M. Akbar Yasin
Declaring function templates before defining when overloading
Declaring function templates before defining when overloading
like below fixes the issue C++ Primer 5th Edition has a snippet of advice at the end of chapter 16.3 (a chapter discussing function template overloading): , The author is warning you of this:
TAG : cpp
Date : November 05 2020, 07:07 PM , By : Pat Rttg
Print() function failing to output vector, whats wrong?
Print() function failing to output vector, whats wrong?
wish helps you So my job is to describe the functions that our teacher only gave us prototypes to for a phonebook assignment. He also gave us a built main() and we are not allowed to change his main() or prototypes, only describe them. I'm working on
TAG : cpp
Date : November 05 2020, 07:07 PM , By : Debra Reed
Why std::ios_base::sync_with_stdio isn't implemented in libc++ (clang)?
Why std::ios_base::sync_with_stdio isn't implemented in libc++ (clang)?
it should still fix some issue sync_with_stdio is just an advisory function, as far as I can tell.ios.members.static/2 says:
TAG : cpp
Date : November 05 2020, 07:07 PM , By : Chris Wheeler
Custom Icon for a C++ Program on the Unity Launcher - Ubuntu
Custom Icon for a C++ Program on the Unity Launcher - Ubuntu
wish helps you I appreciate the time and response Olaf, but might I would like to make a suggestion. If you have a point, then state it in the first post instead of dragging it out with multiple posts. The solution to the problem was to create a Desk
TAG : cpp
Date : November 05 2020, 07:07 PM , By : Kane
How to display PGM image using OpenCV
How to display PGM image using OpenCV
hop of those help? The problem is not in the way data are loaded, but in the way they are displayed.Your image is a CV_16UC1, and both imshow and imwrite normalize the values from original range [0, 65535] to the range [0, 255] to fit the range of th
TAG : cpp
Date : November 05 2020, 07:07 PM , By : bronx72
It's dangerous to use an assignment because the previous value is invalid
It's dangerous to use an assignment because the previous value is invalid
will help you What he means is that constructor for T never ran. And thus you can not use ham object in any way. Having it in a union like that is the only way I know of to formally have a usable named object without it's constructor being ran.This i
TAG : cpp
Date : November 05 2020, 07:07 PM , By : Varun Patil
Error accessing point data in boost::geometry polygon
Error accessing point data in boost::geometry polygon
like below fixes the issue I am trying to iterate through the points in a boost polygon to perform an operation on them. To show a simplified version of my problem: , You are using a member function x. But you forgot to call it:
TAG : cpp
Date : November 05 2020, 06:58 PM , By : Kentiko
Recognize a piece of a string, delete it, then save the remainder of the string into a separate variable? c++
Recognize a piece of a string, delete it, then save the remainder of the string into a separate variable? c++
To fix the issue you can do let the stream do the work for you. You should be able to do something like this:
TAG : cpp
Date : November 05 2020, 06:58 PM , By : Sucha
Visual Studio C++ Console Application Won't Run
Visual Studio C++ Console Application Won't Run
I hope this helps you . It turns out that the application was hanging during a call to CoCreateInstance triggered by some static initialization logic in one of the dependent DLLs. I guess the trick is trying to identify static initialization logic in
TAG : cpp
Date : November 05 2020, 06:58 PM , By : Yingyan Hua
What are TCHAR strings and the 'A' or 'W' version of Win32 API functions?
What are TCHAR strings and the 'A' or 'W' version of Win32 API functions?
I hope this helps . Let me start off by saying that you should preferably not use TCHAR for new Windows projects and instead directly use Unicode. On to the actual answer:Character Sets
TAG : cpp
Date : November 05 2020, 06:58 PM , By : Ferdinand Bana Jimen
How to check how many times a number has been entered
How to check how many times a number has been entered
seems to work fine I'm trying to solve one of the questions on a task sheet I've been received, to help me further in my understanding of C++ code from my class. , Put
TAG : cpp
Date : November 05 2020, 06:58 PM , By : Luc
Organizing text file output into columns
Organizing text file output into columns
will be helpful for those in need Some cleanup and the best I could to mimick the formatting, hopefully it is of some inspiration/assistance.
TAG : cpp
Date : November 05 2020, 06:58 PM , By : Hastimal Jangid
Why should bind() be deprecated?
Why should bind() be deprecated?
seems to work fine How do you do it? Very straight forward and less esoteric (my opinion) than the bind example with std::ref and placeholders_.
TAG : cpp
Date : November 05 2020, 06:58 PM , By : Marina Limeira
c++ callbacks like in java
c++ callbacks like in java
this one helps. I wondered if there is a way to implement callbacks in C++ like it's possible in java? To be more specific: To define the callback function directly when passing it to another function. , You use lambdas from C++11 further on:
TAG : cpp
Date : November 05 2020, 06:58 PM , By : Tushar Bissessar
Find nodes at the edge of a BST
Find nodes at the edge of a BST
Hope that helps Perform level-order traversal (using queues). Every time you dequeue, for the level in which you're, check if it's the smallest or the largest value that you've recorded so far.
TAG : cpp
Date : November 05 2020, 06:58 PM , By : Sangrey Wilma
MFC Titlebar icon having transparency applied
MFC Titlebar icon having transparency applied
I hope this helps . I needed a version with it's own alpha channel. Converting the icon image to a 32bit/pixel format resulted in it displaying normally.
TAG : cpp
Date : November 05 2020, 06:58 PM , By : Sam
Reason for code incompatibility between C++ 2003 and C++ 2011 when referencing enums
Reason for code incompatibility between C++ 2003 and C++ 2011 when referencing enums
hop of those help? I believe (but am not 100% sure) that before C++11, you couldn't use the name of the enum type itself as a qualifier.In other words, mha_planner::MetaSearchType::ROUND_ROBIN is allowed in C++11, but in earlier versions, the enum va
TAG : cpp
Date : November 05 2020, 06:58 PM , By : Mark Host
Double comparison - numeric limits
Double comparison - numeric limits
To fix the issue you can do It is because numeric_limits::min(); is the lowest positive number expressible in double floating-point precision, not the most negative number.
TAG : cpp
Date : November 05 2020, 09:01 AM , By : ali cinkilic
C vs C++ struct alignment
C vs C++ struct alignment
I wish this helpful for you Both the C and C++ language standards make no requirements of struct padding and leave it to be a compiler implementation detail. A strict interpretation of this would mean that there is no guarantee a struct would be the
TAG : cpp
Date : November 05 2020, 09:01 AM , By : Irene Velásquez A
How can I make my vector update when passed in a function?
How can I make my vector update when passed in a function?
wish of those help When I have this piece of code: , You pass the vector by reference instead of by value.
TAG : cpp
Date : November 05 2020, 09:01 AM , By : dapplebay
Why does this kind of initialization not work?
Why does this kind of initialization not work?
Does that help Local variables are automatic - they go out of scope when the function returns and any further access to them (like via pointers as you did) is undefined behavior.new allocates memory on the free store, which is independent of scopes o
TAG : cpp
Date : November 05 2020, 09:01 AM , By : Abudul Adeoye
The function CreateWICTextureFromFile() will not actually load a texture (Direct3D11, C++)
The function CreateWICTextureFromFile() will not actually load a texture (Direct3D11, C++)
will help you A quick way to test if you have loaded the texture data correctly is to use SaveWICTextureToFile in the ScreenGrab module right after loading it. You'd only do this for debugging of course.
TAG : cpp
Date : November 05 2020, 09:01 AM , By : Archibald Picq
C++ Array Processing
C++ Array Processing
this one helps. I am having trouble debugging this code so it reads two columns from the file and when the first column (Department is the same it just adds the second column to the old dept already created)This code is having trouble with looping. A
TAG : cpp
Date : November 05 2020, 09:01 AM , By : R.Sitton
How can a class-based actor's state be accessed from a blocking context (C++ Actor Framework)
How can a class-based actor's state be accessed from a blocking context (C++ Actor Framework)
I hope this helps . I'd like to access a class-based actor's state from a blocking context by exposing the current state via regular class methods. What's the best approach? I can think of three main avenues: , You're answering your own question righ
TAG : cpp
Date : November 05 2020, 09:01 AM , By : alaa al'eqoul
C++ Delete temporary node in a member function?
C++ Delete temporary node in a member function?
I hope this helps . No.tempNode is just a non-static local variable with automatic storage duration; it's scope is confined to the begin and the end of the function. It is automatically deallocated when the function returns.
TAG : cpp
Date : November 05 2020, 09:01 AM , By : Kumaresan M
Modify Eigen matrix diagonal
Modify Eigen matrix diagonal
To fix the issue you can do I have an Eigen::MatrixXd and I need to modify the value of the elements in its diagonal. In particular I have another Eigen::MatrixXd with one single column and the same number of rows of the first matrix. , This works fo
TAG : cpp
Date : November 05 2020, 09:01 AM , By : Mohammed Bashir
C++ Alphabetically sorting strings
C++ Alphabetically sorting strings
This might help you Strings are compared by their letters in order. Let's take a moment to remember that strings, at the end of the day, are characters arrays, and let's remember too that characters have a numerical value by themselves, ranging from
TAG : cpp
Date : November 05 2020, 09:01 AM , By : Satish Kashyap
Qt static library: undefined reference to functions
Qt static library: undefined reference to functions
I wish this helpful for you The problem is the following. The library was built with Visual Studio C++ compiler (2015 version) and Qt 5.5 would like to build with MinGW or Visual Studio C++ 2013. (Depends on the settings and Qt version) The function
TAG : cpp
Date : November 05 2020, 09:01 AM , By : Jaspreet Saluja
Qt - Drag and Drop File into ListView
Qt - Drag and Drop File into ListView
should help you out You should override these event functions for QListView, not QMainWindow. When you do ui->listView->setAcceptDrops(true);, QListView is now the widget that reacts to the drop events, by calling its virtual dropEvent and dragEnterE
TAG : cpp
Date : November 04 2020, 04:02 PM , By : Palani Kumar
Connect a signal to two slots but execute only one slot at a time in Qt
Connect a signal to two slots but execute only one slot at a time in Qt
wish of those help A simple solution would be to add an extra parameter to your signal that specifies which slot should respond to the signal. The signal will read this parameter and decide with an if statement whether or not it should execute its co
TAG : cpp
Date : November 04 2020, 04:02 PM , By : Mashudi Galih
How can the newly created instance of type T be accessed after calling spawn_typed<T>(...)? (C++ Actor Framework)
How can the newly created instance of type T be accessed after calling spawn_typed<T>(...)? (C++ Actor Framework)
I wish this help you Actors are asynchronous entities and should be considered isolated. While it is technically possible to get a raw pointer via actor_cast and downcast it to the actual type, I strongly advise against doing so. Only an actor itself
TAG : cpp
Date : November 04 2020, 04:02 PM , By : user4567026
Template function without explicit usage of type, strange overload ranking
Template function without explicit usage of type, strange overload ranking
wish help you to fix your issue Yes. It's just that T can't be deduced from the argument. That's ok because you've supplied a template argument in (2) and (3).
TAG : cpp
Date : November 04 2020, 04:02 PM , By : Claude SG
How to instantiate instance variable without copy constructor and assignment operator
How to instantiate instance variable without copy constructor and assignment operator
I think the issue was by ths following , I am using a library with a class that does not have an assignment operator implemented and the copy constructor is disabled. I can instantiate a local instance of LibraryClass named var like this: , You need
TAG : cpp
Date : November 04 2020, 04:02 PM , By : Santhosh
C++ class vector issues
C++ class vector issues
this will help Ok, I'm working on this inventory program, in which what is supposed to happen is the user inputs various bits of information about a particular product, then it gets passed to the inventory, while giving the user the opportunity to ch
TAG : cpp
Date : November 04 2020, 04:02 PM , By : Simran Kaur
How to initialize OpenCL const vector with C++ array? [Host]
How to initialize OpenCL const vector with C++ array? [Host]
hope this fix your issue One way to get around this without renouncing to the const-ness is by using the loved/hated reinterpret_cast. You could define your constructor as follows:
TAG : cpp
Date : November 04 2020, 04:02 PM , By : Charlene
C++ XOR failing when reaching null byte?
C++ XOR failing when reaching null byte?
will help you The std::string constructor that takes in a char* assumes that the input is a null-terminated string, so even though your string literal has lots of data in it past the null byte, when you pass it into your function the std::string cons
TAG : cpp
Date : November 04 2020, 04:00 PM , By : Asif Salman Malik
Best practices coding c++
Best practices coding c++
Hope this helps In modern C++ programming, typically, if you encounter an error where the program can't continue, then I think it's better to throw an exception.So your function would wouldn't return anything (i.e. void). Whenever it ran into a can't
TAG : cpp
Date : November 04 2020, 04:00 PM , By : Ed Rasher
Update a pointer in a set to point to an equivalent object with different properties in C++?
Update a pointer in a set to point to an equivalent object with different properties in C++?
like below fixes the issue You cannot change what the pointer in the set points to. Allowing that would break the implicit ordering present in a set. You'll need to remove the old pointer and insert the new pointer.
TAG : cpp
Date : November 04 2020, 04:00 PM , By : DK Sauce Man
Type un-erasure from a boost::program_options value
Type un-erasure from a boost::program_options value
like below fixes the issue C++ syntax for the win. Do:
TAG : cpp
Date : November 04 2020, 04:00 PM , By : Jack
Difference between T t {x} and T t = { x } for integral or enumeration type?
Difference between T t {x} and T t = { x } for integral or enumeration type?
help you fix your problem If you take a look at direct initialization and copy initialization references, you will find the same words:
TAG : cpp
Date : November 04 2020, 04:00 PM , By : Dheeraj Reddy
Setting Pointers to 2d Array equal - Invalid array assignment
Setting Pointers to 2d Array equal - Invalid array assignment
With these it helps I have a pointer to 2d array of qint8: qint8 *data[200][8]; , I have a pointer to 2d array of qint8: qint8 *data[200][8];
TAG : cpp
Date : November 04 2020, 04:00 PM , By : Arthur Faizi
Function pointer inside template function
Function pointer inside template function
seems to work fine You can't pass any representation of PrintThatObject to PrintSpecificObject. The problem is that PrintSpecificObject takes a function pointer. PrintThatObject is a member function. Huge difference!You could fix PrintSpecificObject,
TAG : cpp
Date : November 04 2020, 04:00 PM , By : Mani Kandan
Trying to setup a C programming environment
Trying to setup a C programming environment
To fix this issue to Bo Persson for his quick comment. If your program builds properly, but it freezes the console or just doesn't seem to start (but the IDE shows something's going on) is because AVAST Antivirus is stopping it from executing properl
TAG : cpp
Date : November 04 2020, 09:01 AM , By : Rubén
Clarification about Boost multi-index container
Clarification about Boost multi-index container
around this issue I am trying to learn about Boost multi-index, may I please seek some help regarding that. , Q.:
TAG : cpp
Date : November 04 2020, 09:01 AM , By : Django
boost thread worker object re-use after thread has finished
boost thread worker object re-use after thread has finished
I wish this helpful for you a very simple way to implement a thread pool is to use boost::asio.Complete example here, including two types of task (function and object) plus exception handling:
TAG : cpp
Date : November 04 2020, 09:01 AM , By : P Amin
C++ Hello World freezes on Windows
C++ Hello World freezes on Windows
will help you The problem is solved by deactivating Avast, thanks to Hans Passant. It is also possible to add the executable to the Avast exclusion list.
TAG : cpp
Date : November 04 2020, 09:01 AM , By : Jatin Malhotra
Use a byte flag to indicate non-null pointers
Use a byte flag to indicate non-null pointers
wish help you to fix your issue The byte field is not there as a "safety check" - it's there as an optimisation. It provides him with a trivial check as to whether the current node is a leaf node (with no children) without having to check each child
TAG : cpp
Date : November 04 2020, 09:01 AM , By : ruch
C++ read from text file and seperate into vectors
C++ read from text file and seperate into vectors
seems to work fine Trying to read from a text file with format: , How about:
TAG : cpp
Date : November 04 2020, 09:01 AM , By : sandanil prashan
casting operator() - cast to reference and cast to value
casting operator() - cast to reference and cast to value
like below fixes the issue As a matter of fact, you need both and with a bit of tweaking, the compiler will know which to choose. All the magic is in the fact that you can (and should, when it makes sense) define a member function to be const, id est
TAG : cpp
Date : November 04 2020, 08:17 AM , By : calf runian
Quaternion To Direction Vector
Quaternion To Direction Vector
I wish did fix the issue. So let's rephrase what you want to do: you have a representation of the camera's position in the global frame, G_p1, and want to move it forward in its own frame by an amount C_t = [0;0;1] (here, G_ prefix means global frame
TAG : cpp
Date : November 04 2020, 08:17 AM , By : Domenico
Removing elements from an unordered_multimap
Removing elements from an unordered_multimap
To fix the issue you can do After call to erase, your iterator is invalidated. And then you try to use it on the next iteration.You need to use a return value of erase as the new iterator.
TAG : cpp
Date : November 04 2020, 08:17 AM , By : Shivam Mahajan
For loop not updating struct object
For loop not updating struct object
I wish this helpful for you There are multiple things here that are not ok.First of all, you don't initialize the Point, so it has some random data. The random data is not so random, because in the loop the memory allocation is always the same, so th
TAG : cpp
Date : November 04 2020, 08:17 AM , By : Nasrudeen Pasu
Access denied in application when trying to set event created by service
Access denied in application when trying to set event created by service
this one helps. Shouldn't you be using EVENT_MODIFY_STATE for the access right? MSND states that EVENT_MODIFY_STATE is needed for SetEvent().
TAG : cpp
Date : November 04 2020, 08:17 AM , By : Димитър Г.
Too many initializers error for a simple array in bcc32
Too many initializers error for a simple array in bcc32
I wish this help you Borland BDS2006 (and possibly newer versions)has some issues with default constructor/destructor for class and struct inside its C++ engine.
TAG : cpp
Date : November 04 2020, 08:17 AM , By : Dave
c++ delete pointer and then access the value of it points to
c++ delete pointer and then access the value of it points to
Does that help I just learned pointer and delete pointer in class for C++. I tried this code by my own , You first leaked a pointer
TAG : cpp
Date : November 04 2020, 08:17 AM , By : Hakan Gence

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