Recent questions tagged C++

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c++ - Is there a difference between Boost's scoped mutex and WinAPi's critical section?

In Windows environment, is Boost's scoped mutex using WinAPI's critical sections, or something else? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Constructor initialization list with empty initialization

What does _currentHandle() mean below? template<class SpiHandleT> class SpiHandleIterator : public ISpiHandleIterator< ... _currentHandle; }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Finding compiler vendor / version using qmake

Is there any way to get the version and vendor of the compiler used by the user through qmake? What I need is ... be made by the build system. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How do you write (portably) reverse network byte order?

Background When designing binary file formats, it's generally recommended to write integers in network byte order ... heretic) network protocol. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ linux accept() blocking after socket closed

I have a thread that listens for new connections new_fd = accept(Listen_fd, (struct sockaddr *) & their_addr, ... to closing the listing socket? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Initializing shared_ptr member variable, new vs make_shared?

When initializing a shared_ptr member variable: // .h class Customer { public: Customer(); private: std:: ... version, which is preferred? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - error LNK2019: unresolved external symbol

I've recently started to program in C++ again, and for the purposes of education, I am working on creating a poker ... } } return hand; } }; See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Opengl Render To Texture With Partial Transparancy (Translucency) And Then Rendering That To The Screen

I've found a few places where this has been asked, but I've not yet found a good answer. ... | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to remove elements from an std::set while iterating over it

How can I remove elements from an std::set while iterating over it My first attempt looks like: set<T> s; for ... s the standard way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Copy or reference semantics of boost::spirit's rule<>?

I am trying to write a shell language parser in Boost.Spirit. However, I am unclear about some basic issues ... any misconceptions in this post? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Automatically count the number of instantiated classes in a TMP?

Given a template metaprogram (TMP), do C++ compilers produce build statistics that count the number of instantiated ... to get 100% correct. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - "Nonrepresentable section on output" error during linking on linux

I get this error at the linker stage when compiling the webkit-1.1.5 package on my Ubuntu 9.04 box: ... across a make clean;make invocation. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What's the simplest way of defining lexicographic comparison for elements of a class?

If I have a class that I want to be able to sort (ie support a less-than concept), and it has ... data members may be any Comparable class. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - STL map onto itself?

I'd like to create a std::map that contains a std::vector of iterators into itself, to implement a simple ... I can declare the full map? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Pointer to array of base class, populate with derived class

If I have a base class, with only virtual methods and 2 derived classes from the base class, with those ... is an array of DerivedClasss? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to develop a DirectFB app without leaving X.11 environment

I'm trying to develop a GUI application for an embedded platform, without any windowing whatsoever and I'm doing that ... crash. So, any ideas? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Double hash before parameter in function call

I see this line in C: #define log(format, args...) snprintf(buffer + strlen(buffer), 1023 - strlen(buffer), ... the last param in snprintf()? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why can't I instantiate operator<<(ostream&, vector<T>&) with T=vector<int>?

In thinking about C++ iterator question, I wrote this sample program: #include <vector> #include <iostream> #include < ... <<", "; } #endif See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What is dynamic type of object

What i think is that dynamic type means dynamically allocated object using new. In the following case, do you say p points ... ; Base *p = &d; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Edit Value of a QDomElement?

I need to edit the text of a QDomElement - Eg I have an XML file with its content as - <root> < ... samples, links would we greatly welcome. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - OpenCV closing a shape and filling it

I want to output a blue-filled hand but get the incorrect output. I've included the input picture, incorrect ... imshow("Fill",drawing); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Calling a constructor of the base class from a subclass' constructor body

I was under impression that it's impossible, see for example: Calling the constructor of the base class after some ... use Visual C++ 2010. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Fastest base conversion method?

Right now I'm working on a project which requires an integer to be converted to a base 62 string many times ... sense sans its owning class. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to convert std:string to CString in unicode project

I have a std::string. I need to convert this std:string to a Cstring. I try to use the .c_str() but ... string to a CString in unicode project ? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to sort file names with numbers and alphabets in order in C?

I have used the following code to sort files in alphabetical order and it sorts the files as shown in the figure ... like this way? Please help See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How does Qt5 redirect qDebug() statements to the Qt Creator 2.6 console

After searching around for a reason that qDebug() statements work fine with Qt's standard message handler but fail ... in the Qt sources yet. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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358 views

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c++ - Performance of std::function compared to raw function pointer and void* this?

Library code: class Resource { public: typedef void (*func_sig)(int, char, double, void*); //Registration ... /gcc.godbolt.org/z/-6mQvt See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What's the latest version of Boost compatible with VC++6?

What is the latest version of the Boost library that is compatible with Microsoft Visual C++ 6? And can ... out downloads for older versions? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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