C++ - Страница 1247

I have this code, but I need help to use OpenMP #pragma s to increase its speed. I want to parallelize the for loops over variables i and j . The values of n and m can be much larger, too. For example, n = 1000 , m = 500 .
My code:
for (int i = 0;...

for (int nu = 0; nu < 20; nu++) {
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
double matrixPtr = matrix .first;
double matrixPtrSecond = matrix .second;
double localReS1 = 0.0;
double localImS1 = 0.0;
for (double theta = 0; theta < 2...

I want to list FTDI ports with their description, here is my program:

#include
#include ftd2xx.h

int main( int argc, char* argv[] )
{
DWORD numDevs = 0, i = 0;
FT_DEVICE_LIST_INFO_NODE *ftDevList = NULL;
FT_STATUS ftStatus;

/* Get the number...

I'm trying to understand the basics of C++ classes and the different forms of copying a class to another one, I made a simple class that use a table as a stack and i created simple function for stacking/unstacking integers
pileInt.h :
class...

The following C++ code does not compile with VS2015:
#include
#include

void main()
{
const time_t t = std::time(nullptr);

std::tm tm = {};

std::localtime_s(&tm, &time);
}

The error messages are:
Microsoft (R) C/C++ Optimizing Compiler...

How we can render or draw texts, numbers and characters in openGL and Qt opengl widget?
is there any step by step guide?
I tried renderText method but it seems that this method is no longer supported.
and freetype is mentioned in some sources but i...

I have two classes: a Parent class and a Child class (inheriting from the Parent class). I would like to know if it is possible to cast/transform a Child** to a Parent** with reinterpret_cast or something else. Is such a thing possible?
Below is a...

See following code:
#include
#include
#include
#include

class exception_t
: public std::exception
{
public:
template
exception_t(std::string_view users_fmt, args_t&&... args)
: m_users_fmt(users_fmt)
,...

I was able to run this c++ program in linux without any errors.
This time I am trying to run a c++ program named epa in Linux using cmd but this time time , I am facing some errors....

I'm currently working on a project where I need to monitor the value of a variable stored within another process's memory. I don't have access to the source code of the target process, so I'm looking for advice on the best approach to achieve this....

Consider the definition of compare_and_exchange_strong_explicit :
_Bool atomic_compare_exchange_strong_explicit( volatile A* obj,
C* expected, C desired,
memory_order succ,
memory_order fail );

I'm confused by the use-case of memory_order fail ....

I'm attempting to create a generic method that in C# would do the following:
public class Component{}

public class GameObject{
public T AddComponent() where T : Component{}
}

And I'm trying to convert that to C++ and so far came up with:...

I am creating an application which displays the market data and uses it in some other forms too. I store market data in a map say
std::map . Let me give one used case of how this map can be used.

network sends a data packet encapsulating the...

Is it possible to use C++ language in making a game and use Python for artificial intelligence of NPCs?

Источник:

#include
#include

int main() {
auto vec = std::vector{1, 2, 3};
auto rng = std::ranges::subrange(vec.begin(), vec.end(), 3); // error
}

My compiler is clang-18 with libc++, the compiler error is as follows:

no viable constructor or deduction...

Is it possible to use C++ language in making a game and use Python for artificial intelligence of NPCs?
In my country, this question has not been answered in my own language. I will be very happy if you answer.
This text is only to fill the minimum...

I'm attempting to create a generic method that in C# would do the following:
public class Component{}

public class GameObject{
public T AddComponent() where T : Component{}
}

And I'm trying to convert that to C++ and so far came up with:...

I declare a struct in a header file. I use this struct in two compilation units. One is compiled with -std=c++11 and the other with -std=c++20. The sizeof my struct is different in the two compilation units.
Is it allowed to mix any -std=c++20 and...

I have two classes a Parent class and a Child class (inheriting from the Parent class) I would like to know if it is possible to cast/transform a Child** to a Parent** with reinterpret_cast or something else?
Or such thing is not possible
Below is a...

Can Eigen do a 2D cross product?

I was trying to replace this code:

Eigen::Vector2f a, b;
float result = a.x()*b.y() - b.x()*a.y();

With this:

Eigen::Vector2f a, b;
float result = a.cross(b);

However, this gives me the following error:...

See following code:
#include
#include
#include
#include

class exception_t
: public std::exception
{
public:
template
exception_t(std::string_view users_fmt, args_t&&... args)
: m_users_fmt(users_fmt)
,...

I use Visual Studio Code, and i have a problem with the extension for the C++.
When i include iostream it returns me that error:

#include errors detected. Please update your includePath. Squiggles are disabled for this translation unit...

I'm using msvc, now I need a logger function that can:

acquire the caller's name automatically
can receive variadic args just like fmt::format or std::format

I tried the following:

use macro, it works, but it's not easy to encapsulate into...

I have downloaded and extracted the latest opencv-4.9.0 and installed latest code blocks-20.03.
When I tried to use the opencv functions like waitKey(), imread, imshow() to load an image and to display, after including the paths in the build...

I'd like to understand better why choose int over unsigned ?

Personally, I've never liked signed values unless there is a valid reason for them. e.g. count of items in an array, or length of a string, or size of memory block, etc., so often these...