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CPP QUESTIONS

Why location 0x00000000 is accessible if it is a flash memory
Why location 0x00000000 is accessible if it is a flash memory
I think the issue was by ths following , The decision as to what happens when using what address is rather complex. It depends on the processor architecture, OS and sometimes "what some software does".The processor may not have memory protection, or
TAG : cpp
Date : November 01 2020, 01:03 PM , By : 欧阳安
Is it possible to connect to QApplication notify signal?
Is it possible to connect to QApplication notify signal?
fixed the issue. Will look into that further Maybe you should have a look at event filters, which you can install for all QObjects: QObject::installEventFilter. Write your own class, which you inherit from QObject and implement the eventFilter method
TAG : cpp
Date : November 01 2020, 01:03 PM , By : Shajahan Sha
An std::move function of C++ standard 11 implementation in C
An std::move function of C++ standard 11 implementation in C
I wish did fix the issue. We are all aware of the powerful functionality of the std::move function that is implemented in the C++ standard 11, where it moves the elements in a specific range into a new range. , Regarding your text:
TAG : cpp
Date : November 01 2020, 01:03 PM , By : Gal Avidor
segmentation of the source image in opencv based on canny edge outline attained from processing the said source image
segmentation of the source image in opencv based on canny edge outline attained from processing the said source image
This might help you Use cv::findContours on your second image to find the contour of the segment. Then use cv::boundingRect to find bounding box for this segment. After that you can create matrix and save in it cropped bounding box from your second i
TAG : cpp
Date : November 01 2020, 09:01 AM , By : Gaurav Bhelaye
C++ Linked List Node Creation Causing Infinite Loop
C++ Linked List Node Creation Causing Infinite Loop
With these it helps You should be allocating space when creating your newNode (which should be a pointer to node for the matter).Remember, the model of double linked linear list should be connecting your node to the list (Which you are pointing to) a
TAG : cpp
Date : November 01 2020, 09:01 AM , By : Dino Penava
boost: replace basic classes to std one?
boost: replace basic classes to std one?
should help you out Some libraries use c++11 classes automatically when detected. It depends on the library author.There is no such general compilation flag you can use.
TAG : cpp
Date : November 01 2020, 09:01 AM , By : hugo
How can I account for a decimal using the modulus operator
How can I account for a decimal using the modulus operator
I think the issue was by ths following , The quotient is 0(2/6) with the fractional part discarded.The fractional part is .3333 ... So you are basically talking about the fractional part of the quotient , not the modulus value. Modulus can be calcula
TAG : cpp
Date : November 01 2020, 09:01 AM , By : Neil Ault
c++ pointer being freed was not allocated error
c++ pointer being freed was not allocated error
help you fix your problem The nextStudent field is never initialized, so all 10 elements created here have it pointing to unknown values.
TAG : cpp
Date : November 01 2020, 09:01 AM , By : João Fauvel
Undefined Reference when Invoking Function of One Object from Another Object
Undefined Reference when Invoking Function of One Object from Another Object
I hope this helps . Figured it out:1) You can make a makefile; I use PuTTY to accomplish this for example.
TAG : cpp
Date : November 01 2020, 09:01 AM , By : Jay
Weird issue with signals in QML
Weird issue with signals in QML
To fix this issue There is no issue. You can read about it here: http://doc.qt.io/qt-5/qtqml-syntax-objectattributes.htmlproperty-attributes
TAG : cpp
Date : November 01 2020, 09:01 AM , By : Dilan Patel
Why is the copy constructor called in this code after the assignment operator?
Why is the copy constructor called in this code after the assignment operator?
may help you . Because if you don't return a reference of the object it makes a copy. As @M.M said about the final test() call, the copy does not appears because of the copy elision What are copy elision and return value optimization?
TAG : cpp
Date : October 31 2020, 05:43 PM , By : Santihago
Push back Data into Matrix and show that matrix using imshow
Push back Data into Matrix and show that matrix using imshow
will help you as far as I see, `mat.push_back will add another ROW to your matrix. So you create a 10000x20 matrix and you try to add another single element as a new row. That doesn't work because your rows have 20 columns and not just 1 column. So t
TAG : cpp
Date : October 31 2020, 05:43 PM , By : Djura
Different way to initialize
Different way to initialize
Hope that helps Here's the correct way to do this:You define your attributes in a class/struct, and when that struct is initialized, the constructor(OrcishAttributes()) is called:
TAG : cpp
Date : October 31 2020, 05:43 PM , By : Федор Поправкин
Two column TPopupMenu to list shortcuts right aligned
Two column TPopupMenu to list shortcuts right aligned
it should still fix some issue A menu item can have an image (see the TMenuItem.ImageIndex property), and can have a shortcut assigned (see the TMenuItem.ShortCut property). The VCL will automatically draw those elements for you, exactly as you have
TAG : cpp
Date : October 31 2020, 05:43 PM , By : MarkT
Read file fail when call C++ function in Swift code
Read file fail when call C++ function in Swift code
I wish this help you As you said, the code in the question is a simple example. I don't think the problem you are asking about, namely the fact that "FAIL" is output, is related to the real difficulties of bridging between C++ and Swift. The C++ func
TAG : cpp
Date : October 31 2020, 05:43 PM , By : kuniatsu
c++ std::move is bad here?
c++ std::move is bad here?
I hope this helps . It's redundant and confusing. Just because I can write std::add_pointer_t instead of void*, or std::add_lvalue_reference_t (or Foo bitand) instead of Foo, doesn't mean I should.It also matters in other contexts:
TAG : cpp
Date : October 31 2020, 05:41 PM , By : Andrew Yi
Segmentation Fault with Libvlc on Mac OSX
Segmentation Fault with Libvlc on Mac OSX
To fix the issue you can do If you use libvlc v2.2 - you have to use slightly modified libvlc tree (I have one prepared, please extract it from command line, to preserve symlinks)The problem is libvlc v2.2 has a bug which leads to load libvlccore by
TAG : cpp
Date : October 31 2020, 05:41 PM , By : andal_claim
error_complexity using std regex, how do I increase allowed complexity of search operation?
error_complexity using std regex, how do I increase allowed complexity of search operation?
I think the issue was by ths following , There is no way, VC++ std::regex is very bad. Switched to boost, fixed problem.
TAG : cpp
Date : October 31 2020, 05:41 PM , By : Anup Tiwari
moving variable declarations outside for loop
moving variable declarations outside for loop
To fix this issue You did not move all the variables. pos and b are still defined inside the loop, hiding the outside definitions (and the outer pos became a vector for some reason). The outer variables are untouched inside the loop, hence are not in
TAG : cpp
Date : October 31 2020, 05:41 PM , By : Amit Shah
Unhandled exception after reading from a binary file, when control is returned to calling function
Unhandled exception after reading from a binary file, when control is returned to calling function
Hope that helps I created a struct to hold the data being read to the file, then converted all strings to char arrays. Doing each of those did not work, but the combination did. The following is the test program with a main() and a test class (with a
TAG : cpp
Date : October 31 2020, 05:41 PM , By : Prakash Raushan
How make a dynamic array using void** and void*?
How make a dynamic array using void** and void*?
To fix the issue you can do Using a double pointer for a data type such as int** with give you a dynamic 2D array, or a dynamic array of pointer objects, depending on your implementation, and a single int* is just a normal dynamic array. To full inst
TAG : cpp
Date : October 31 2020, 05:41 PM , By : Phan Nguyễn Minh Văn
C++ nested loop issue
C++ nested loop issue
help you fix your problem Ok, this is pretty bizarre... I'm working on my final project for this class, and it has a series of loops that tell the program what to do based on user input. They worked just fine. I then coded another loop inside one of
TAG : cpp
Date : October 31 2020, 05:41 PM , By : Keerthana Dabbara
How can I access the members of a struct in a loop?
How can I access the members of a struct in a loop?
around this issue Yes, it's possible. Initialize an array of pointer offsets using offsetof. Then add that to reinterpret_cast(struct_var), cast that to the target type, and there you go...you have a pointer to the member and you can iterate them in
TAG : cpp
Date : October 31 2020, 05:41 PM , By : lunar
reversing non-zero-initialized chars in array
reversing non-zero-initialized chars in array
seems to work fine Cheers guys - here's what I ended up coming up with. Seems like it works.
TAG : cpp
Date : October 31 2020, 05:41 PM , By : Rama M
Understanding the List Operator (%) in Boost.Spirit
Understanding the List Operator (%) in Boost.Spirit
wish helps you Update X3 version added
TAG : cpp
Date : October 31 2020, 01:52 PM , By : GRouslan
How to call a C++ function in a C++ Program
How to call a C++ function in a C++ Program
I think the issue was by ths following , The function program is not known to the compiler since it's declared after your main function. You must declare it before like so
TAG : cpp
Date : October 31 2020, 01:52 PM , By : Hamza Hmidi
combinational sum calculation issue
combinational sum calculation issue
this one helps. Only (!target) is enough because the condition target >= i * need + need * (need - 1) / 2. target == 0 implies that target == i in the last step, also note target >= i * need + need * (need - 1) / 2, so we can assert that need == 1 wh
TAG : cpp
Date : October 31 2020, 01:52 PM , By : Bas Fonville
What is wrong with this C++ recursion function of mine?
What is wrong with this C++ recursion function of mine?
wish of those help first off sorry if the code comes out weird. Looks good after following the instructions for sharing here but it's my first time. Anyways, I have a class assignment where I need to create a recursive function that when given an arr
TAG : cpp
Date : October 31 2020, 01:52 PM , By : Fikri Si Pemikir
Address Sanitizer: "SEGV on unknown adress" when using throw-catch and printf
Address Sanitizer: "SEGV on unknown adress" when using throw-catch and printf
it helps some times Turns out the problem appears only after linking against a file that has lines like std::cerr
TAG : cpp
Date : October 31 2020, 01:52 PM , By : jpmaus
Type conversion, explicit constructors etc
Type conversion, explicit constructors etc
hop of those help? I have BigNum class. What exactly methods, constructors etc. I need to implement to have desired effect (like in comments)? ,
TAG : cpp
Date : October 31 2020, 01:52 PM , By : Orjanh
Delegate nullptr parameter to the pointer overload in template code
Delegate nullptr parameter to the pointer overload in template code
Hope this helps The simplest way would probably be to implement an overload void f(std::nullptr_t), and dispatch to one of the pointer implementations, which can be chosen by you, assuming it does the right thing (whatever the right thing is) for nul
TAG : cpp
Date : October 31 2020, 01:52 PM , By : Kylo Ren
openGL - Rotating above and below an object using gluLookAt
openGL - Rotating above and below an object using gluLookAt
I hope this helps . I have a cube in open GL. I have the cube rotating by multiplying by the rotation matrix. I have also got the camera rotating around the cube on the x axis using gluLookAt as you can see below. , To make the cam orbiting an object
TAG : cpp
Date : October 31 2020, 01:52 PM , By : Sumeet Sharma
Adding Node to LinkedList Not Permanent C++
Adding Node to LinkedList Not Permanent C++
I wish this helpful for you You need to either adjust the next pointer on the previous last node or adjust the head.Here's the corrected code [sorry for the gratuitous style cleanup]:
TAG : cpp
Date : October 31 2020, 01:52 PM , By : Saloni Porwal
How to convert from std::tm to Windows::Foundation::DateTime
How to convert from std::tm to Windows::Foundation::DateTime
it fixes the issue You can convert you time to unix with mktime, and then add magic number 116444736000000000ULL:
TAG : cpp
Date : October 31 2020, 01:52 PM , By : DoDo
Does an operator exist for this?
Does an operator exist for this?
this one helps. Yes, you can do that. You do that by providing a conversion operator as a member function.
TAG : cpp
Date : October 31 2020, 01:52 PM , By : Rahul Bhadani
Base Class Pointer only getting a Derived class variable value and not the base class variable value why?
Base Class Pointer only getting a Derived class variable value and not the base class variable value why?
it helps some times Why should j be different? There's only one j, which is declared in Shape. When you're deriving from Shape, you're not adding more js, there would need to be some j declared in Line, too. On the other hand, you have separate obj f
TAG : cpp
Date : October 31 2020, 01:52 PM , By : Mohit Badhe
Sun Movement (Y/Z movement)
Sun Movement (Y/Z movement)
should help you out This is just simple trigonometry. The period (Time until the function repeats) of sine(x * n) and cosine(x * n) are both 2*pi / n. In this case, n = 1, so the period is 6.28, meaning one full day (and night) will last 6.28 seconds
TAG : cpp
Date : October 31 2020, 01:49 PM , By : Thiness babu
Cannot use template function with lambda as parameter
Cannot use template function with lambda as parameter
seems to work fine calc is a constant and can be used as a template parameter, while instead fun is a variable and therefore cannot.Unfortunately you cannot pass a lambda directly as a template parameter just because you cannot (the standard says you
TAG : cpp
Date : October 31 2020, 01:49 PM , By : Adithyan RK
Create Dynamically Allocated Array with Pointers to Structs C++
Create Dynamically Allocated Array with Pointers to Structs C++
I wish this help you There are two approaches. Either you allocate an array of structures and introduce one more pointer that will point to the element in the array that will play the role of the head. For example
TAG : cpp
Date : October 31 2020, 01:49 PM , By : woadams123
My MakeFile can't find my header directory
My MakeFile can't find my header directory
will be helpful for those in need This is my Makefile : , With your rule
TAG : cpp
Date : October 31 2020, 01:49 PM , By : Andrew Nilssen
Does gcc automatically use -j4? Is there anything I can do to optimize my compilation?
Does gcc automatically use -j4? Is there anything I can do to optimize my compilation?
This might help you The -j jobs option is for make not gccWhen used with make it will cause multiple "recipes" to be executed in parallel. In this context, your gcc line is one recipe.
TAG : cpp
Date : October 31 2020, 01:47 PM , By : dengke xiong
functor overloading best practices
functor overloading best practices
Does that help I would like to know if it is possible to overload A such that it could be passed b, c and also e.g. x reusing the code in the operator().
TAG : cpp
Date : October 31 2020, 01:47 PM , By : Karim S
stack is being reset after each push and shows empty message
stack is being reset after each push and shows empty message
With these it helps i have a program with 3classes. , This function
TAG : cpp
Date : October 31 2020, 01:47 PM , By : MDF
function template: default first template argument to second
function template: default first template argument to second
this one helps. Is is possible to make the first template argument of a function template default to the second one if the first one is not specified? , You could simply add an overload for this special case:
TAG : cpp
Date : October 31 2020, 01:47 PM , By : Ramasubramanian
Is an empty class usable as a constexpr variable without an initializer or explicit default constructor?
Is an empty class usable as a constexpr variable without an initializer or explicit default constructor?
may help you . If we start from the draft C++14 standard section 7.1.5 [dcl.constexpr] we can find the requirements for a constexpr object declaration are:
TAG : cpp
Date : October 31 2020, 01:47 PM , By : Telerion
Retrieving QPushButton from QWidget
Retrieving QPushButton from QWidget
fixed the issue. Will look into that further Perhaps you could use QGraphicsProxyWidget::widget to get the underlying QWidget* and then use dynamic_cast to cast to QPushButton*:
TAG : cpp
Date : October 31 2020, 01:47 PM , By : Adrian
Circular iteration of std::list
Circular iteration of std::list
I wish this helpful for you The issue here is that you are taking Container by value. This causes a copy so the iterators returned by container.end() and container.begin() are not that same as the iterator passed to the function. Instead if you pass
TAG : cpp
Date : October 31 2020, 01:47 PM , By : DominarQuintus
How to stop an infinite loop due to invalid input C++
How to stop an infinite loop due to invalid input C++
seems to work fine You need to test the value of a BEFORE proceeding to read b; something like this:
TAG : cpp
Date : October 31 2020, 01:47 PM , By : Jovelyn Domen
List Insert STL
List Insert STL
wish help you to fix your issue Your itList iterator refers to a different container. itList points to a member of _mapDirectors[director].second but you're trying to use it as an insertion point into llista.I think the problem is that you wanted lli
TAG : cpp
Date : October 31 2020, 01:47 PM , By : yqpan1989
User defined class contructor and functions arent working, did i construct my class incorrectly?
User defined class contructor and functions arent working, did i construct my class incorrectly?
this one helps. Change Card x(); to Card x; to declare a default constructed variable.
TAG : cpp
Date : October 31 2020, 01:47 PM , By : Sara895 Sa
How can I fill an array with unimportant values (after declaration)?
How can I fill an array with unimportant values (after declaration)?
this will help One option would be to initialize the vector in a member initializer list:
TAG : cpp
Date : October 31 2020, 10:01 AM , By : Christopher Bennetts
When does std::shared_ptr release its object?
When does std::shared_ptr release its object?
I hope this helps . Whatever is managed by a std::shared_ptr will be destroyed the moment there's no std::shared_ptr left asserting a claim, all other ways to refer to it are irrelevant.And local variables are only destroyed upon leaving the respecti
TAG : cpp
Date : October 31 2020, 10:01 AM , By : madAddam
error: no matching function for call to 'TNode<Student>::TNode<const Student&)'
error: no matching function for call to 'TNode<Student>::TNode<const Student&)'
it fixes the issue Both of your TNode constructors take two arguments. You are only passing one.
TAG : cpp
Date : October 31 2020, 10:01 AM , By : Danny Young
Basic fun with static const integral members
Basic fun with static const integral members
Hope that helps Since you are odr-using i by taking its address it has to be defined outside the class:
TAG : cpp
Date : October 31 2020, 10:01 AM , By : Zelong Liu
Visualize .trk file with VTK
Visualize .trk file with VTK
may help you . Vtk does not have reader for trackvis format. According to this https://www.nitrc.org/frs/shownotes.php?release_id=724 trackvis v >=0.5 can export vtk format.
TAG : cpp
Date : October 31 2020, 10:01 AM , By : Melissa Owens
Overriding a virtual method based on template type sign
Overriding a virtual method based on template type sign
With these it helps Your override is wrong...You have to forward your call, something like:
TAG : cpp
Date : October 31 2020, 10:01 AM , By : jstv
Matrix-Vector and Matrix-Matrix multiplication using SSE
Matrix-Vector and Matrix-Matrix multiplication using SSE
I wish this helpful for you Without any tricks or anything, a matrix-vector multiplication is just a bunch of dot products between the vector and a row of the matrix. Your code doesn't really have that structure. Writing it actually as dot products (
TAG : cpp
Date : October 31 2020, 10:01 AM , By : Daniel Choi
C++ ifstream, issue loading with ";"
C++ ifstream, issue loading with ";"
wish of those help It is fairly simple to read in a file in the format. You can use std::getline with a different delimiter to tell it where to stop reading the input.
TAG : cpp
Date : October 31 2020, 10:01 AM , By : ASulli17
virtual function and modified this pointer
virtual function and modified this pointer
hop of those help? Your case is actually too simple: The compiler can know that you have a pointer to a D object, so it can perform the lookup from the right table, passing the unmodified this pointer to the f2() implementation.
TAG : cpp
Date : October 31 2020, 05:57 AM , By : Leonardo Priori
What information does a 'sample' hold in a VST?
What information does a 'sample' hold in a VST?
I wish this helpful for you Given that the computer cannot store a continuous wave of amplitudes, information is gathered at discrete points.These discrete points are known as samples, and the rate at which they are taken from the continuous waveform
TAG : cpp
Date : October 31 2020, 05:57 AM , By : pkyinc

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