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CPP QUESTIONS

Trying to use quadtrees for collision detection in a game
Trying to use quadtrees for collision detection in a game
it fixes the issue Yes -- either that or, upon insertion, split your square up into 4 separate ones in this case. Easier is just allow duplicates to be stored at the leaves, and make that cheap (pointer/index to the square, e.g.)You can also make a l
TAG : cpp
Date : November 14 2020, 07:01 AM , By : Samson Paul
What can I do with C++ modules in Visual Studio 2015 so far? (using the experimental switch)
What can I do with C++ modules in Visual Studio 2015 so far? (using the experimental switch)
hop of those help? Here's how to get a simple example working with the Update 1 RTM, based on the instructions in the video linked in @dxiv's answer.First, the module definition file mine.ixx. Compile it with: cl /c /experimental:module mine.ixx. Thi
TAG : cpp
Date : November 14 2020, 07:01 AM , By : AnArmadillo
g++ was not declared in this scope
g++ was not declared in this scope
it helps some times I im writing sqlite3 wrapper with class to read db file. I im using ubuntu 64-bit and g++ compiler...and when i run code above i get this: , I found another problem, you should compile all *.cpp files.
TAG : cpp
Date : November 14 2020, 07:01 AM , By : Shoaib Asim
Bit window operation
Bit window operation
wish helps you Suppose I have 2 64-bit unsigned integer. I have a window of size k, and at one time it starts at the end of the first integer and ends at the start of the second integer. (Of course, I know where it starts) , Try this:
TAG : cpp
Date : November 14 2020, 06:58 AM , By : JavaBeginner
Drawing a circle using OpenGL C++
Drawing a circle using OpenGL C++
hop of those help? The code which actually creates circle verticesas cos(x) and sin(x) function returns values is [0..1] than multiplication to some value will give us circle with radios of that value. Adding or subtracting x and y values will move t
TAG : cpp
Date : November 14 2020, 06:58 AM , By : davemusicnet
Get x,y,z cord from cv::Mat
Get x,y,z cord from cv::Mat
With these it helps With reprojectImageTo3D(..) I get an Mat with 3D Points. Now I want to access the x,y,z values of these Points. But I don't know how I can do this? , From the [documentation] you see that:
TAG : cpp
Date : November 14 2020, 06:58 AM , By : JayPa
Qt overload datastream operator <<
Qt overload datastream operator <<
this will help to Jaa-c and RobbieE comments I got it, in the end I overloaded for both streams:circle.cpp:
TAG : cpp
Date : November 14 2020, 06:58 AM , By : GioTheGio
Opencv VideoWriter saves only one frame
Opencv VideoWriter saves only one frame
This might help you I'm trying to create 1fps webm from two images, Code: , It should be
TAG : cpp
Date : November 14 2020, 06:58 AM , By : Jonathon Spencer
Troubles with Curlpp
Troubles with Curlpp
will be helpful for those in need When i'm compiling this code: , On Mint 17 I was able to compile and run your program using
TAG : cpp
Date : November 14 2020, 06:58 AM , By : Matthew Ray
Luhn Algorithm not functioning properly c++
Luhn Algorithm not functioning properly c++
fixed the issue. Will look into that further I am not familiar with the algorithm you are trying to implement but it seems the source of your problems is the fact the reverseNumber array is not initialized.In the validateCardNumber function, you are
TAG : cpp
Date : November 14 2020, 06:58 AM , By : amostep
searching boost::multi_index by sequence and obtaining the next element by order
searching boost::multi_index by sequence and obtaining the next element by order
I wish did fix the issue. I want to search a boost::multi_index container by sequence and obtain the next element by order.
TAG : cpp
Date : November 13 2020, 09:01 AM , By : jam balaka
How can I declare a class in my structure?
How can I declare a class in my structure?
it should still fix some issue This is my .hpp , It seems you mean the following
TAG : cpp
Date : November 13 2020, 09:01 AM , By : Muhammed Almol
boost::uint32_t != std::uint32_t for ARM target
boost::uint32_t != std::uint32_t for ARM target
With these it helps uint32_t should always represent a 32-bit width unsigned integer, yes.But it's perfectly possible for sizeof(long unsigned int) == sizeof(unsigned int) to be true. Those are two different types that can have the same width.
TAG : cpp
Date : November 13 2020, 09:01 AM , By : Zachery Fahrny
Using QDataStream to serialize custom class causes C2679 error
Using QDataStream to serialize custom class causes C2679 error
may help you . I fixed it.The problem was that I didn't have operators to put my QList into a QDataStream. But I defined wrappers to store my list in QVariant, so (of course) I just should have used those.
TAG : cpp
Date : November 13 2020, 09:01 AM , By : David Johnson
How to handle messages in WinApi C++ wrapper
How to handle messages in WinApi C++ wrapper
may help you . Passing data through to a winproc callback is somewhat roundabout, but if you notice the documentation for CreateWindow, there's an lpParamparameter which you can use to pass data through to a WM_CREATE or WM_NCCREATE event.So you can
TAG : cpp
Date : November 13 2020, 09:01 AM , By : Sunil Chanchlani
Why my triangle is white?
Why my triangle is white?
it fixes the issue Your shaders shouldn't compile. As a result, you don't have a valid program. Depending on the profile of the GL context - and the actual GL implementation - you will get different results. With nvidia drivers, you will typically se
TAG : cpp
Date : November 13 2020, 09:01 AM , By : nooby
(C++) How to check whether or not an input string is an integer?
(C++) How to check whether or not an input string is an integer?
hope this fix your issue Read in all of the user's input line as a string, then convert the string to an integer with std::stoi.Unfortunately std::stoi will happily stop converting when it hits the end of convertible characters, but it allows you to
TAG : cpp
Date : November 13 2020, 09:01 AM , By : Relevance
How can i calculate my array entry
How can i calculate my array entry
wish help you to fix your issue I have a std::vector wich i init like this : , You can use modular arithmetic:
TAG : cpp
Date : November 13 2020, 09:01 AM , By : squall
Trouble in installing WxWidgets
Trouble in installing WxWidgets
will be helpful for those in need You have some other gcc in your path, the normal one definitely understands all of these options and, contrary to a comment above, no space is needed after -MT. Try running where gcc to find out where is it coming fr
TAG : cpp
Date : November 13 2020, 09:01 AM , By : K K Mistry
Passing a vector<vector<int> > to an argument
Passing a vector<vector<int> > to an argument
help you fix your problem Either you have stripped some important parts of the error message, or your compiler is exceptionally uncommunicative. The handling of initializer lists is still sometimes a bit - erm - suboptimal. Please try this:
TAG : cpp
Date : November 13 2020, 05:43 AM , By : harkx
Assigning array to array by having pointer to its first element
Assigning array to array by having pointer to its first element
it fixes the issue cords is a local variable, so using it beyond the end of the function it has been defined in is undefined behavior.An easy way would be to pass a pointer to firstCords to getPosition and let getPosition fill it in. Declare getPosit
TAG : cpp
Date : November 13 2020, 05:43 AM , By : siddhesh sakpal
Do static casts take execution time?
Do static casts take execution time?
With these it helps static_cast MAY take time at run-time. For example, if you convert int to float then work is required. Usually casting pointers does not require any run-time cost.
TAG : cpp
Date : November 13 2020, 05:43 AM , By : Suvro Kundu
Strange C++ Arduino serial behavior
Strange C++ Arduino serial behavior
fixed the issue. Will look into that further I am writing some code for my arduino to print 4 button states and the X,Y coordinates from an analogue joystick and I am having strange behavior. , You have several buffer overruns in the code.
TAG : cpp
Date : November 13 2020, 05:43 AM , By : rattakresch5000
c++: Arrays, too many initializers
c++: Arrays, too many initializers
wish helps you , Your first element somearray[0] has 6 elements
TAG : cpp
Date : November 13 2020, 05:43 AM , By : Manuel Medina
compiling on linux server (u2) warning long long
compiling on linux server (u2) warning long long
fixed the issue. Will look into that further You're compiling with the "pedantic" flag. Turn it off if you don't really need it.
TAG : cpp
Date : November 13 2020, 05:43 AM , By : Jyotsna Gupta
is it valid to use standard library function name as identifier in C++?
is it valid to use standard library function name as identifier in C++?
I hope this helps . It's well-formed because neither std::printf nor ::printf (which may also have been declared by !) are declared in the same scope as your integer, which therefore takes automatic precedence for the duration of the block.
TAG : cpp
Date : November 13 2020, 05:43 AM , By : Epzilon
Problems with lcurl in CLion
Problems with lcurl in CLion
wish helps you i'm new in CLion and i want to improve my skills in libcurl. I have installed libcurl4-openssl-dev on Ubuntu 15.04. My CMakeLists.txt: , to @sjsam. The solution is(CMakeLists.txt):
TAG : cpp
Date : November 13 2020, 05:43 AM , By : Jesper Andersson
No more than 9 arguments in QString arg? How to deal with it?
No more than 9 arguments in QString arg? How to deal with it?
wish help you to fix your issue You can chain .arg() calls like this, with up to 9 arguments in each one:
TAG : cpp
Date : November 13 2020, 05:43 AM , By : user4572648
Connecting the dots on the given diagram
Connecting the dots on the given diagram
seems to work fine If you want to create tetragon (shape with 4 vertixes) instead of rectangle (shape with 4 vertixes and all angles equal to 90 degrees) - i. e. connect points that human can simply classify as lines, the simplest way is creating arr
TAG : cpp
Date : November 13 2020, 05:40 AM , By : Redshot
What is the correct type of std::fixed, std::scientific etc.. in c++?
What is the correct type of std::fixed, std::scientific etc.. in c++?
this will help The type of these manipulators is std::ios_base (std::ios_base str). They are functions.It means, you need to use std::vector FlagArray;.
TAG : cpp
Date : November 13 2020, 05:40 AM , By : Seifeddine Miledi
Are the send and receive methods of sf::UdpSocket threadsafe?
Are the send and receive methods of sf::UdpSocket threadsafe?
should help you out I can't answer for the package you're using, but at the operating system level these methods are atomic and therefore thread-safe. You can invoke them from multiple threads at the same time. Simultaneous sends and receives will pr
TAG : cpp
Date : November 13 2020, 05:40 AM , By : Sam Hardy
Some stdperiph files are grayed in project explorer in eclipse (stm32) Why?
Some stdperiph files are grayed in project explorer in eclipse (stm32) Why?
Does that help It means the directory and/or files are being filtered from the source locations in eclipse. Do this if you wanna get rid of it..(Project) Properties ->C/C++ General ->Paths and Symbols ->Source Location Tab ->Edit Filter... ->Remove
TAG : cpp
Date : November 13 2020, 05:40 AM , By : Sreepriya M
Track member variable value change
Track member variable value change
To fix this issue If it is possible for you to change the data type of the member, you can change it to a logger type.Example:
TAG : cpp
Date : November 13 2020, 05:40 AM , By : SilverK
What is eth_dr in ethernet ip in c++/C?
What is eth_dr in ethernet ip in c++/C?
I hope this helps you . Searching a little bit on google returns these precise lines from a repo on GitHub.Using the GitHub search feature on the repo returns those lines:
TAG : cpp
Date : November 13 2020, 05:40 AM , By : sreejonK19
Understanding how to use the factorial function in c++
Understanding how to use the factorial function in c++
fixed the issue. Will look into that further I have this code which works out the factorials for all integers between 0 and 9. , What does this part of the code do?
TAG : cpp
Date : November 13 2020, 05:40 AM , By : Eomer1975
std::cout with floating number
std::cout with floating number
may help you . The rounding off happens because of the C++ standard which can be seen by writing std::cout
TAG : cpp
Date : November 13 2020, 05:40 AM , By : user4572407
Keeping unique elements of an array in C++
Keeping unique elements of an array in C++
this one helps. Here are two approaches that represent fairly general types of solutions:
TAG : cpp
Date : November 13 2020, 05:40 AM , By : Jack Ng
`VirtualAllocEx` returns same address when specifying different start addresses?
`VirtualAllocEx` returns same address when specifying different start addresses?
To fix this issue The VirtualAllocEx allocates memory with portions divisible memory page size which is 4096 byte.
TAG : cpp
Date : November 13 2020, 05:40 AM , By : Jack Thorp
decltype(auto) deduced return type from lambda capture
decltype(auto) deduced return type from lambda capture
help you fix your problem clang seems correct to me. I agree with your interpretation that the lambda return type must be decltype(u), but not that decltype(u) is unmovable.
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Eduardo Marques
How do I extract a single character from a line and put it in a const char*
How do I extract a single character from a line and put it in a const char*
Any of those help You return a pointer to local data. The Output string goes out of scope as soon as the function returns, and the pointer is then invalid.Why don't you return a std::string instead?
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Shubhra Gupta
Nested loop unrolling
Nested loop unrolling
Does that help Given I have a function , You can try do something like this:
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Syed Zaidi
Call derived method from base pointer
Call derived method from base pointer
To fix the issue you can do You are calling a virtual function from within the constructor!Duplicated of -> Calling virtual functions inside constructors
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Masror Syed
How do I make a menu with structure array (transfering lua code to c++ code)
How do I make a menu with structure array (transfering lua code to c++ code)
should help you out Your coding is quite good. I mean, the Lua. You'll be a good C programmer too after some practice.Here's how to do it in C (it's not really C++):
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Sachin Mathur
strncpy segfaults at ssse3 altough all parameters look correct
strncpy segfaults at ssse3 altough all parameters look correct
I wish this helpful for you Modifying character constants is undefined, and in many modern compilers, character literals are stored in either read-only data-space or code-space. These are both "read only", meaning the storage can not be written to.Si
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Mohammad Mufassil
Using physical constants with boost
Using physical constants with boost
wish of those help You need to divide the electric charge of the electron by the electric charge unit: Coulomb:
TAG : cpp
Date : November 12 2020, 09:01 AM , By : nathanolly
pthread support in visual studio 2013
pthread support in visual studio 2013
wish of those help So, I'm just tried to compile your code and got the same error. It's because you should do explicit conversion void* pointer returned from malloc.
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Pietro Simonini
std::thread class vs std::this_thread namespace in c++?
std::thread class vs std::this_thread namespace in c++?
I hope this helps . The this_thread namespace groups functions that access the current thread, so when we need do something on the current thread, we do not need access to the thread object of the thread.The thread class does not provide access for y
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Andrrss
Disabling control variable while worker thread is finishing MFC
Disabling control variable while worker thread is finishing MFC
will be helpful for those in need Your worker thread could post a completion message back to your UI thread. Your UI thread wouldn't need a special message loop in that case, instead your window procedure would then reenable the buttons when it recei
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Ankh Kokopelli
Printf() function acting strange
Printf() function acting strange
hop of those help? You are missing a pair of { ... } for the contents of your while block. Currently, only the dataFile >> x[i] >> y[i] >> sigmay[i]; line is inside the while block.
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Coffrages Saulnier
C++ can't call method
C++ can't call method
I wish this help you I've got the following code and have no idea how I can call the AMethod() function. Can anyone help me with this? Thank you
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Michael_Mosaad
c++ convert infinity to max and -inf to min
c++ convert infinity to max and -inf to min
I wish did fix the issue. The key here is, you can compare +inf or -inf to 0 with < and >, so testing the sign is very easy.
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Sabri √únal
Retrieve value from std::vector<cv::Point>::const_iterator
Retrieve value from std::vector<cv::Point>::const_iterator
it helps some times You can see from minmax_element documentation that it returns a pair of iterators.Given:
TAG : cpp
Date : November 12 2020, 09:01 AM , By : Sherman Cen
Need help diagnosing errors in C++ program designed to extract timestamps from an XML file
Need help diagnosing errors in C++ program designed to extract timestamps from an XML file
around this issue Are you sure you carefully read the reference for all the functions you are using ? Your new friend
TAG : cpp
Date : November 11 2020, 09:01 AM , By : Daniel987
OpenGL 3+ failure on Intel/AMD C++
OpenGL 3+ failure on Intel/AMD C++
it fixes the issue In your DrawTileVerts, you're passing in a parameter called 'size'.From the way you're passing it into your call to glDrawArrays, it looks like it ought to be the number of vertices.
TAG : cpp
Date : November 11 2020, 09:01 AM , By : Eliran Zach
Single protected member variable in base class VS Multiple private member variable in derived class
Single protected member variable in base class VS Multiple private member variable in derived class
I think the issue was by ths following , The difference is that by having a single member in the base class you can provide default implementation or even base class member functions that manipulate the image.The dark side is however that you're plac
TAG : cpp
Date : November 11 2020, 09:01 AM , By : Senti Eti
Defining 2D arrays in C++
Defining 2D arrays in C++
I hope this helps you . , Yes! It is a valid intialization in c++.
TAG : cpp
Date : November 11 2020, 09:01 AM , By : kirilla
How can I "prepare " char arrays to boost::asio::streambuf::mutable_buffers_type buffers?
How can I "prepare " char arrays to boost::asio::streambuf::mutable_buffers_type buffers?
it helps some times ostream Simplest way is to use the streambuf as intended... as a streambuf:
TAG : cpp
Date : November 11 2020, 09:01 AM , By : Priti kanitkar
Why can't the program output immidiately?
Why can't the program output immidiately?
Hope that helps You can use header file string instead, which provides more flexibility like below:
TAG : cpp
Date : November 11 2020, 09:01 AM , By : Cornel Boppart
Lua 5.3 in Visual Studio 2015
Lua 5.3 in Visual Studio 2015
help you fix your problem You're probably running into the C-runtime changes introduced in VS2015: The Great C Runtime Refactoring.You can add the following library to supply those definitions in the Additional Dependencies in the Project Settings ->
TAG : cpp
Date : November 11 2020, 09:01 AM , By : rois
Issues figuring out readin/writeout for a bank program
Issues figuring out readin/writeout for a bank program
Does that help IN the newAccount function you will have to store the username and password with the following lines of code.
TAG : cpp
Date : November 11 2020, 09:01 AM , By : Muayad Qanadilo

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