Recent questions tagged C++

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c++ - Rcpp Rtools installed but error message g++ not found

I have consulted existing entries on SO related to my specific issue, but still could not resolve it. I am ... run into this specific issue? 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++ - Clang and undefined symbols when building a library

I'm working on a C++ framework, and there's a few issues when I compile it on OSX with Clang. First ... ::thread_data_base() in server.cpp.o 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++ - Where is the definition of `top-level cv-qualifiers` in the C++11 Standard?

In the draft C++11 standard: N3337 I found several references to top-level cv-qualifiers, but no definition. 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++ - Pack an HTML5 app and deploy it on the desktop

I have read tons of articles and stackoverflow questions but I seem not get it to work. I want to distribute ... packeges that I could use? 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++ - Code reuse in exception handling

I'm developing a C api for some functionality written in C++ and I want to make sure that no exceptions are ... no other way to do it. 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 Contours in OpenCV?

When you retrieve contours from an image, you should get 2 contours per blob - one inner and one outer. ... than cvFindContours ()) Thanks. 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++ - Obtaining local IP address using getaddrinfo() C function?

I'm trying to obtain my local (not the external) IP address using the getaddrinfo() function, but I saw the examples ... .x ( just an example ). 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 I allocate a std::string on the stack using glibc's string implementation?

int main(void) { std::string foo("foo"); } My understanding is that the above code uses the default ... is allocated entirely on the stack? 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 using std::forward

To my knowledge, the two common ways of efficiently implementing a constructor in C++11 are using two of them Foo ... t it the most optimal way? 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++ - Specify a class member function as a friend of another class?

According to the C++ Primer book, the author mentioned that we can specify a class member function as a friend of ... am using Visual C++ 2005) 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 determine what is 'sequenced before' others?

I went through this excellent answer regarding Undefined Behaviour and Sequenced [Before/After] relations in C++11. I ... quote the same here? 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 can you open a file with the program associated with its file extension?

Is there a simple way to open a file by its associated program in windows? (like double clicking it in windows ... (a random explorer is shown). 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++ - Differences between template specialization and overloading for functions?

So, I know that there is a difference between these two tidbits of code: template <typename T> T inc(const ... act differently from each other? 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++ - Converting statvfs to percentage free correctly

I have a terribly uncomplicated test program that prints out the following numbers. i.e. int main(int argc, ... the side of being conservative. 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 does C++11 have implicit moves for value parameters, but not for rvalue parameters?

In C++11, value parameters (and other values) enjoy implicit move when returned: A func(A a) { return ... them differently in the standard? See Question&Answers more detail:os...

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

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208 views

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c++ - inline virtual function

In C++, my understanding is that virtual function can be inlined, but generally, the hint to inline is ... inline virtual function is good? 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++ - Boost.Python: How to expose std::unique_ptr

I am fairly new to boost.python and trying to expose the return value of a function to python. The function signature ... ("f", &Message::f) ; See Question&Answers more detail:os...

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

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276 views

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c++ - Performance impact of -fno-strict-aliasing

Is there any study or set of benchmarks showing the performance degradation due to specifying -fno-strict-aliasing ... in other compilers)? 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++ - Compile a static binary which code there a function gethostbyname

How to resolve compile a static binary which code include a function gethostbyname and if compiled without warning ... resolve my heavy problem. 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 the default constructor

class base { int i; public: base() { i = 10; cout << "in the constructor" << endl; } }; int main( ... gets called but not in the second case! See Question&Answers more detail:os...

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

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653 views

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c++ - Linking with a debug/release lib with qmake/Qt Creator

I am using Qt Creator and have a Qt GUI project that depends on a C++ static library project. I want to ... there support in qmake 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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290 views

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c++ - Conditional compile-time inclusion/exclusion of code based on template argument(s)?

Consider the following class, with the inner struct Y being used as a type, eg. in templates, later on: template< ... there I can use. :/ 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++ - when to use JNIEXPORT and JNICALL in Android NDK?

I'm trying to write my own jni sources. Looking at some ndk samples, I found that they often use those macros ... and how to use these macros See Question&Answers more detail:os...

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

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442 views

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c++ - How do I cleanly reconnect a boost::socket following a disconnect?

My client application uses a boost::asio::ip::tcp::socket to connect to a remote server. If the app loses ... it? Or is it something more? 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++ - Is using increment (operator++) on floats bad style?

Is it considered "bad style" to use the increment operator (++) on floats? It compiles just fine but I ... that the value is unchanged. See Question&Answers more detail:os...

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

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484 views

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c++ - Create a boost::shared_ptr to an existing variable

I have an existing variable, e.g. int a = 3; How can I now create a boost::shared_ptr to a? For example: boost ... = &a; // this doesn't work 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++ - Displaying the address of a string

I have this code: char* hello = "Hello World"; std::cout << "Pointer value = " << hello << std:: ... the actual address that hello points to? See Question&Answers more detail:os...

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

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376 views

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c++ - What is the difference between GetClientRect and GetWindowRect in WinApi?

What of these should I use in InvalidateRect to refresh my window? And why? See Question&Answers more detail:os...

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

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