Recent questions tagged C++

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c++ - error_complexity using std regex, how do I increase allowed complexity of search operation?

error_complexity The complexity of an attempted match against a regular expression exceeded a pre-set level. I get an ... . How can I fix? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why is this working? I cannot understand the logic of this swapping

int main() { // Complete the program string a,b; getline(cin,a); getline(cin,b); cout<<a.size()<<" " ... Is it something to do with the strings? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Does std::vector::insert() invalidate iterators if the vector has enough room (created through reserve)?

Answering How to self-copy a vector? has got me a bit confused about iterator invalidation. Some literature ... standard which guaranties this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to pass a boost asio tcp socket to a thread for sending heartbeat to client or server

I am writing a client/server program in boost TCP in which I want to send a HEARTBEAT message to the client ... is a synchronous TCP server. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - OpenGL Lighting on texture plane is not working

I want to light to the texture plane but this is not work. Light on solid sphere is very well, but texture plane is ... , and how do I fix it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Use class member as WNDPROC/DLGPROC with or without global

I'll go ahead and give a summary to this, how can I use a dialog procedure that is a member of a class? ... use a member function as a DLGPROC? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Memory usage isn't decreasing when using free?

Somehow this call to free() is not working. I ran this application on Windows and followed the memory using in Task ... ("PAUSE"); return 0; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why can't I dynamic_cast "sideways" during multiple inheritence?

The following code throws std::bad_cast struct Foo { void foo () {} }; struct Bar { Bar () { dynamic_cast <Foo & ... Foo* Bar::as_foo()=0; ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Variable template at class scope

Using N3651 as a basis, A variable template at class scope is a static data member template. The example given is ... as a template What gives? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - std::string to SecByteBlock conversion

I'm currently writing blowfish encryption/decryprion program in C++ (using crypto++). I really didn't find a satisfied ... "pause"); return 0; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Paint widget directly on QListView with QStyledItemDelegate::paint()

After hours of work, I'm able to paint a widget on QListView. However, the painting is done through a QPixmap. ... the widget doesn't show up. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Zoom functionality using Qt

Current implementation, zooms towards the center of View so items present in the top left corner or the current mouse ... } event->accept(); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How do I print out the arguments of a function using a variadic template?

This example uses a common variadic template and function. I want to print out the arguments passed to f: #include < ... I can do to help it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why I can't enlarge a widget added to QGraphicScene by QSizeGrip?

I have added a widget to a graphic scene QGraphicScene through a QGraphicsProxyWidget. To move it I have set ... is shown in the image. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Incorrect floating point math?

Here is a problem that has had me completely baffled for the past few hours... I have an equation hard ... solutions? Thanks in advance, -Faken See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - BGL indexing a vertex by keys

My requirement is to have a graph structure where each vertex is uniquely identified by a boost::uuids::uuid. ... or bimap with index property See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Escape all special characters in printf()

Is there an easy way to escape all special characters in the printf() function? The reason why I would like to know how ... : data[ i ] ) ); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - SetRootIndex in QML PathView

I'm using a QML PathView to show my model. Such a model inherits from QStandardItemModel and has two levels of data ... :/fly.jpg",imgRole); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - LoadLibrary fails with error code 193

I'm stuck as to why I can't load my dll "interfac" using LoadLibrary. It seems to be failing when loading ... .text E5000 .textidx 1000 .tls See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Kill my process if the other process is killed

I want to write a code that starts a process and kills mine when the other process is killed. Do you ... MB_ICONINFORMATION); EndDialog(0); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Reading in a specific column of data from a text file in C

My text file looks like this: 987 10.50 N 50 383 9.500 N 20 224 12.00 N 40 I want to read only the ... data. How would I got about doing this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How should a size-limited stl-like container be implemented?

While refactoring, I wanted to change an array where entries are added to an std::vector, but for compatibility ( ... but with an upper-limit. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - I want to store a value even after my program ends

I want to store a letter into a variable so that whenever the program starts again it can use the variable in ... is the way to achieve this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Initialization order of static data inside class template

// File: InitFirst.h #pragma once template <int val> struct InitFirst { static float ... statically initializing g_shouldBeOneThird? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - unrecognized command line option '-stdlib=libc++' gcc (Homebrew gcc 5.3.0) 5.3.0

I run Mac OSX El Capitan, I have installed via Homebrew gcc version 5.3.0. I want to install pyopencl (but as ... Google, but I hope it exists. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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515 views

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c++ - std::getline() reads carriage return into the string, how to avoid that?

I need to read all attributes from a tеxt file that looks like the following for one Stern (engl.: Star) object. I ... ; }; #endif /* STERN_H */ See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - OpenCV undistorts only a central part of fisheye image

I'm trying to perform fisheye camera calibration via OpenCV 3.4.0 (C++, MS Windows). I used cv::fisheye: ... have a solution of this problem? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Loading data into a vector of structures

I am trying to load some data from a text file into a vector of structures. My question is, how do you ... : vector subscript out of range." See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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