Recent questions tagged C++

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c++ - Serialize and send a data structure using Boost?

I have a data structure that looks like this: typedef struct { unsigned short m_short1; unsigned short m_short2 ... much appreciated. Thanks! 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 is static variable initialization implemented by the compiler?

I'm curious about the underlying implementation of static variables within a function. If I declare a static variable ... initialized = 1; } 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++ - Async wait on file descriptor using Boost Asio

I'm trying to integrate D-Bus with my boost::asio application. D-Bus has an API that enumerates a set of ... depend on glib or other mainloops. 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++ - Stack Size Estimation

In multi-threaded embedded software (written in C or C++), a thread must be given enough stack space in order ... , but all ideas are welcome. 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++ - Where does one get the "sys/socket.h" header/source file?

I've been trying to write a server in C++ Unix style, but I'm stuck on a Windows machine. I started with ... , and I would really appreciate 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++ - std::ofstream, check if file exists before writing

I am implementing file saving functionality within a Qt application using C++. I am looking for a way to ... looking for a Boost solution. 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++ - dereferencing a pointer when passing by reference

what happens when you dereference a pointer when passing by reference to a function? Here is a simple example ... a temporary object produced? 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 fix: /usr/lib/libstdc++.so.6: version `GLIBCXX_3.4.15' not found

So I'm now desperate in finding a fix for this. I'm compiling a shared library .so in Ubuntu 32 bit (Have ... Linaro 4.6.4-1ubuntu1~12.04)` 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++ - Detect gcc as opposed to msvc / clang with macro

I am working on a project that has been built with both gcc and msvc so far. We recently started building with ... this *only* for gcc #endif 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 disable warnings for particular include files?

I wold like to disable particular warnings for all files that are included, directly or indirectly, by particular ... solutions for that too. 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++ - What would a std::map extended initializer list look like?

If it even exists, what would a std::map extended initializer list look like? I've tried some combinations ... but found nothing that compiled. 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 access MySQL from multiple threads concurrently

We're doing a small benchmark of MySQL where we want to see how it performs for our data. Part of that test ... could work, but it feels wrong) 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++ - C++11 way to index tuple at runtime without using switch

I have a piece of c++11 code similar like below: switch(var) { case 1: dosomething(std::get<1>(tuple)); ... I do not argue which one is better. 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++ - Using a static library in Qt Creator

I'm having a hell of a time finding documentation which clearly explains how to use a static library in Qt ... include files from the library. 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++ - Macro / keyword which can be used to print out method name?

__FILE__ and __LINE__ are well known. There is a __func__ since C99. #include <iostream> struct Foo { void Do(){ ... method name like Foo::Do? 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 find the name of the calling function?

I have been using PRETTY_FUNCTION to output the current function name, however I have reimplemented some functions ... of the calling routine? 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++ - Is the default Move constructor defined as noexcept?

It seems that a vector will check if the move constructor is labeled as noexcept before deciding on whether to ... with the keyword default. 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 Use CCache with CMake?

I would like to do the following: If CCache is present in PATH, use "ccache g++" for compilation, else use ... ccache (which can be expected). See Question&Answers more detail:os...

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

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586 views

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c++ - MJPEG streaming and decoding

I want to receive JPEG images from an IP camera (over RTSP). For this, I tried cvCreateFileCapture_FFMPEG in ... openRTSP in OpenCV? Regards, 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++ - Declaring a pointer to multidimensional array and allocating the array

I've tried looking but I haven't found anything with a definitive answer. I know my problem can't be ... complicated...Any help is appreciated. 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++ - Can OpenSSL on Windows use the system certificate store?

Some working C++ code that I'm porting from Linux to Windows is failing on windows because ... the system certificate store? 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++ - Compile lua code, store bytecode then load and execute it

I'm trying to compile a lua script that calls some exported functions, save the resulting bytecode to a file and then ... Lua + Luabind (C++) 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 not just use random_device?

I am a bit confused about the c++11 random library. What I understand: we need two separate concepts: random ... e{std::random_device{}()}; 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++ - Display QImage with QtGui

I am new to Qt, and I am trying to create a simple GUI Application that displays an image once a button has ... as an input, and displays 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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556 views

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c++ - Recursively iterate over all the files in a directory and its subdirectories in Qt

I want to recursively scan a directory and all its sub-directories for files with a given extension - for example, ... can you do that in Qt? See Question&Answers more detail:os...

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

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109 views

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c++ - What is the right approach when using STL container for median calculation?

Let's say I need to retrieve the median from a sequence of 1000000 random numeric values. If using anything ... and better alternatives for me? See Question&Answers more detail:os...

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

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215 views

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c++ - How can I create objects while adding them into a vector?

I have a C++ vector. I want the vector to hold a variable number of objects. Visual Studio 2012 is giving me ... vector should be of one type. 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++ - What is the point of clog?

I've been wondering, what is the point of clog? As near as I can tell, clog is the same as cerr ... robust logging facility (links please)? See Question&Answers more detail:os...

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

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