Recent questions tagged C++

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c++ - Repeated elements in a std::vector

I have a std::vector and I want to check all the elements in it. If a certain element appears more than ... to counting everything... 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++ - DirectX Screen Capture - Desktop Duplication API - limited frame rate of AcquireNextFrame

I'm trying to use Windows Desktop Duplication API to capture the screen and save the raw output to a video. I'm ... have no idea what I'm doing). See Question&Answers more detail:...

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

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c++ - Call a Python function from within a C program

I have an application in C and at some point I need to solve a non-linear optimization problem. Unfortunately ... to link the two programs? 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 there a way to do constructor delegation using a conditional in C++11?

I am trying to use C++11 delegation feature to construct a class conditioned on an input value. Is that even possible? The ... A}, x); } } }; 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++ - Locate DLL path by giving a DLLName

If I do LoadLibrary("MyTest.dll") Windows will locate and load it from "C:TestFolderTestMyTest.dll", because "C: ... without having to load 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++ - OpenGL transforming objects with multiple rotations of Different axis

I am building a modeling program and I'd like to do transformations on objects in their own space and then ... then re-apply it somewhere? 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 finishes by throwing an exception ? Is there a memory leak?

I was going over this article and it states Note: if a constructor finishes by throwing an exception, the ... the update might have caused. 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++ - Obtain Argument Index while Unpacking Argument List with Variadic Templates

I need to obtain the index of an argument while unpacking and converting argument list. Is there any solution for the ... ,string,bool>(v); } 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++ - Template matching from a screenshot of a window

What I've done I have a small template image which is meant to be used to find coordinates of matching ... main code: codeshare.io/vLio1 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++ - undefined reference to 'get_driver_instance'

I'm getting "undefined reference to 'get_driver_instance'" when building even the most simple example from: http:// ... code on the server? 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++ - GDI Acceleration In Windows 7 / Drawing To Memory Bitmap

My GDI program runs fine on Windows XP but on Windows Vista and 7 it looks pretty terrible due to the lack of ... for any advice you can offer. 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 properly downcast in C# with a SWIG generated interface?

I've got a very large and mature C++ code base that I'm trying to use SWIG on to generate a C# interface ... #3? Any help would be appreciated. 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 pugi::char_t* to string

Hi I'm using pugixml to process xml documents. I iterate through nodes using this construction pugi:: ... information on pugixml website 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 correctly detect Network drive when running with elevated privileges

I am working on an application that needs to correctly detect all used drive letters on Windows. And I use the ... , but it did not 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++ - Creating a File System "Driver"

I'm looking to create a "driver" I guess for a custom file system on physical disk for Windows. I don't ... for creating a project like 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++ - Can a custom MFC window/dialog be a class template instantiation?

There's a bunch of special macros that MFC uses when creating dialogs, and in my quick tests I'm getting ... 'template' has other meanings. 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++ - CMAKE - setting compile flags for libraries

I have a CMakeLists.txt script to compile my libraries. The problem is I cannot set the compile flags for the ... for a library using CMake? 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 I check whether two numbers are within "x" significant figures of the precision limits of the floating point type?

So suppose we have a float type XType in which we have two numbers: XType const a = 1.2345 XType const b = 1. ... FloatType) n) * e * f_ref; } 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++ - Using SIGINT

According to this http://www.cplusplus.com/reference/clibrary/csignal/signal.html SIGINT is generally used/cause by the ... i am using windows. 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++ - Correct installation of config.h for shared library using autotools

I am converting a C++ program which uses the autotools build system to use a shared library, introducing the ... is hardly an official source. 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++ - Does the order of base-class initializers and member variable initializers matter?

Is the order of the initializers for a class' constructor significant? So say I have: class MyClass : ... something different to example 2? 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 "sizeof" work in this helper for determining array size?

I've found this article that brings up the following template and a macro for getting array size: template< ... of return value" instead? 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++ - Unable to save a float value to a bitfield structure

I have a structure struct { u32 var1 :7; u32 var2 :4; u32 var3 :4; u32 var4 :1; u32 var5 :4; u32 var6 ... help me how could i fix this 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++ - Is a pointer to an array of unknown size incomplete?

3.9/6 N3797: [...] The type of a pointer to array of unknown size, or of a type defined by a typedef ... So where I'm wrong in my reasoning? 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 a boost::archive::binary_oarchive handle an enum?

I have the following Enum enum Example : uint8_t { First = 1, Second = 2, }; and a stringstream: std:: ... to do this). Thanks and Greetings See Question&Answers more detail:os...

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

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342 views

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c++ - std::shared_ptr in an std::initializer_list appears to be getting destroyed prematurely

Edit: This is indeed caused by a bug in Visual Studio - and it has already been fixed. The issue is ... someone explain what might be happening? See Question&Answers more detail:os...

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

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321 views

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c++ - Why does my MFC app hang when I throw an exception?

If you throw an exception from inside an MFC dialog, the app hangs, even if you have a catch block in ... someone from making the same mistake. 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++ - Accessing atomic<int> of C++0x as non-atomic

I have an atomic variable in my program of type atomic<int>. At some places I don't need to access the value ... access, no bus locking et all? See Question&Answers more detail:os...

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

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