Recent questions tagged C++

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c++ - std::vector needs to have dll-interface to be used by clients of class 'X<T> warning

I'm trying to make my library exportable as a DLL but I'm getting a lot of these warnings for one specific ... get rid of these warnings? 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++ - Why is statically linking glibc discouraged?

Most of the sources online state that you can statically link glibc, but discourage from doing so; e.g. centos ... that would be a bad idea. 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++ - Pass multiple arguments into std::thread

I'm asking the <thread> library in C++11 standard. Say you have a function like: void func1(int a, int b, ... is there another way to do 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++ - My enum is not a class or namespace

Hi I have files called MyCode.h and MyCode.cpp In MyCode.h I have declared enum MyEnum {Something = 0, ... ++) Any ideas? Thanks Thomas 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++ - Pointer to incomplete class type is not allowed

For some reason I cannot use functions attached to the object I want to use. I added a comment to ... (){ return onderzoeken; } 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 I use NULL as substitution for the value of 0?

Am I allowed to use the NULL pointer as replacement for the value of 0? Or is there anything ... assignments and other arithmetical operations. 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 can this structure have sizeof == 0?

There is an old post asking for a construct for which sizeof would return 0. There are some high score answers ... link How is this possible? 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++ - Serialization/Deserialization of a struct to a char* in C

I have a struct struct Packet { int senderId; int sequenceNumber; char data[MaxDataSize]; char* Serialize() { char ... this the best we can 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++ - QT 5.5 embed external application into QWidget

I'm interested in embedding an external application inside of my QT 5.5 Widget based application. I'm ... the second application correctly. 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++ libcurl json rest

I am trying to download a json file from a REST webpage in C++ with libcurl. The following code works ... cleanup */ curl_easy_cleanup(curl); See Question&Answers more detail:os...

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

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288 views

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c++ - How to run programs in an external console with Sublime Text in Windows system?

I managed to configure Sublime Text 2 for C++ and I can now compile my code (using the MinGW compiler). ... true, "encoding": "latin1" } 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++ - Alignment along 4-byte boundaries

I recently got thinking about alignment... It's something that we don't ordinarily have to consider, but I've ... this going to cause problems? 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 preferred way of passing data between two applications on the same system?

I have an application (A) that needs to launch another application (B). I need to pass data between the ... there other ways of 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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363 views

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c++ - how in BOOST send a signal in a thread and have the corresponding slot executed in another thread?

In Qt for instance if you emit a signal in a thread other that the GUI thread, the signal is enqueued and ... to do that with boost? 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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191 views

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c++ - Smart pointers with SDL

For my game should I use a raw pointer to create SDL_Window, SDL_Renderer, SDL_Texture etc. as they have specific ... do this with SDL types? See Question&Answers more detail:os...

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

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216 views

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c++ - What is the difference between static_cast and Implicit_cast?

What is implicit_cast? when should I prefer implicit_cast rather than static_cast? See Question&Answers more detail:os...

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

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533 views

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c++ - How to find determinant of large matrix

I found some C++ code for finding the determinant of matrix, for 4x4 to 8x8. It works ok, but my project ... else can I find the determinant? See Question&Answers more detail:os...

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

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514 views

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c++ - Understanding the low-level mouse and keyboard hook (win32)

I'm trying to capture global mouse and keyboard input. LRESULT CALLBACK MouseHookProc(int nCode, WPARAM wParam ... will run independently. See Question&Answers more detail:os...

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

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241 views

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c++ - How does =delete on destructor prevent stack allocation?

In this SO question is stated that this construct prevents stack allocation of instance. class FS_Only { ~FS_Only() ... why would one need 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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340 views

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c++ - How to create a type list (for variadic templates) that contains n-times the same type?

I would like my class template <class T, unsigned int n> class X; to create a std::tuple that contains ... on this error would be 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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315 views

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c++ - How to include correctly -Wl,-rpath,$ORIGIN linker argument in a Makefile?

I'm preparing a c++ app on linux (Ubuntu 16.04) with the use of a few poco libraries which I have ... folder. What have I done 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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238 views

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c++ - Should accessors return values or constant references?

Suppose I have a class Foo with a std::string member str. What should get_str return? std::string Foo::get_str() ... is more idiomatic in 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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170 views

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c++ - #include header guard format?

I know it makes little difference to a project but, assuming you use #defined header guards for your C++ code, ... on a format for these guards. See Question&Answers more detail:os...

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

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223 views

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c++ - Creating a new object from dynamic type info

In C++, is there any way to query the type of an object and then use that information to dynamically create ... create new objects of type Foo? 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 function objects should be pass-by-value

I have just read the classic book "Effective C++, 3rd Edition", and in item 20 the author concludes that built ... know it is class-type anyway? See Question&Answers more detail:os...

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

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250 views

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c++ - How do I generate a random number using the C++11 standard library

The new C++11 Standard has a whole chapter dedicated to random number generators. But how do I perform the simplest ... use out of the box? See Question&Answers more detail:os...

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

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222 views

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c++ - LLDB not showing source code

I am trying to debug a C++ program I am writing, but when I run it in LLDB and stop the program, it ... so the paths get mangled or something. See Question&Answers more detail:os...

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

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148 views

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c++ - Partial ordering with function template having undeduced context

While reading another question, i came to a problem with partial ordering, which i cut down to the following test-case ... 'void f(int, void*)' See Question&Answers more detail:os...

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

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