Recent questions tagged C++

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Using malloc and free, it is easy to allocate structures with extra data beyond the end. But how do I accomplish ... } Output: hamburger is yum 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++ - Qt creator Adding external library (still: Cannot open include file: 'GL/glew.h')

I followed the instruction: In the Projects pane, open the project file (.pro). Right-click in the code editor ... ': No such file or directory 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++ - shared_ptr and cyclic references

I was trying with the cyclic references for boost::shared_ptr, and devised following sample: class A{ // ... required? Thanks in advance. 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++ - BitBlt performance with Aero enabled

I'd like to get more performance out of BitBlt for capturing the screen. When Aero remains enabled, capturing ... screen when Aero is disabled. 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 make to move .o files to a separate directory

I've tried numerous attempts to move my .o files to my obj folder, but no matter what I do, it simply just ... (INCLUDEPATH) -c main.cpp $(OBJ) 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 specify target mac os x version using qmake

I am trying to compile c++11 code on the Mac OS X using Qt Creator/qmake and I am getting the ... Any suggestions would be helpful. 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++ - Access Base class variable from child class method

How can I access base class variable from a child method? I'm getting a segmentation fault. class Base { public: ... Child(); child->foo(); 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++ - CreateProcess succeeds, but GetExitCodeProcess returns C0000142

I'm trying to start a user-mode process from a service using CreateProcessAsUser() API similar to this code. ... code 0xC0000142. Any idea 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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c++ - Compile header-only template library into a shared library?

We are in the process of designing a new C++ library and decided to go with a template-based approach ... but also the partial specialisations.. 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 an Integer Array into a Number

Think I have an integer array like this: a[0]=60; a[1]=321; a[2]=5; now I want to convert the whole ... after running the code. How 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++ - Different template syntax for finding if argument is a class or not

While reading this question , I came across @Johannes's answer. template<typename> struct void_ { typedef void type; ... parameter in Line 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 to generate 64 bit random numbers?

I'm implementing universal hashing and using the following universal hash function : h(k)=((A*k)mod 2^64) ... number returned by rand is int. 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++ - Exception slicing - is this due to generated copy constructor?

I've just fixed a very subtle bug in our code, caused by slicing of an exception, and I now want to make ... confirmation of what was going on. See Question&Answers more detail:os...

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

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452 views

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c++ - Clang VS VC++:"error: declaration of 'T' shadows template parameter"

I was trying to compile the following code for the classic copy&swap idiom on my Mac with clang 3.3 template< ... This works under clang too. 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 a char*?

So I've been watching lectures from a University about C++, and I'm learning a lot, but one thing I still ... but maybe I'm just dead wrong. See Question&Answers more detail:os...

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

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328 views

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c++ practical computational complexity of <cmath> SQRT()

What is the difference in CPU cycles (or, in essence, in 'speed') between x /= y; and #include <cmath> x = ... as a benchmark for x = sqrt(y) 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++ - Synchronizing STD cout output multi-thread

Latelly I've been working with multi-thread coding, after a while writing I realized that if I used std::cout in ... . Thank you for your time! 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 use/create boost::multi_index?

Can someone explain to me in detail how to create a multi index map using boost::multi_index? I saw many examples ... X and some are not unique. See Question&Answers more detail:os...

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

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293 views

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c++ - Translating a std::tuple into a template parameter pack

I have a typedef std::tuple<A, B> TupleType; and would like to use the list of classes for a "template". ... failed "; } return res; } 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++ - With OpenCV, try to extract a region of a picture described by ArrayOfArrays

I am developing some image processing tools in iOS. Currently, I have a contour of features computed, which is ... do that? Thanks in advance! See Question&Answers more detail:os...

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

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271 views

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c++ - Resolving RVA's for Import and Export tables within a PE file

I am currently writing a PE parser/loader. I have successfully loaded the PE file into memory using standard c ... sparse. thanks in advance. See Question&Answers more detail:os...

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

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259 views

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c++ - Higher color depth for MFC toolbar icons?

I was wondering how to make a toolbar in MFC that used 24bit or 256 colour bitmaps rather than the horrible 16 ... of some simple code? 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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413 views

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c++ - Multithreading with Python and C api

I have a C++ program that uses the C api to use a Python library of mine. Both the Python library AND ... so please don't assume anything! See Question&Answers more detail:os...

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

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281 views

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c++ - Problem in overriding malloc

I am trying to override malloc by doing this. #define malloc(X) my_malloc((X)) void* my_malloc(size_t size) { ... know how to do that? 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++ - How can I search for a string in the memory of another process?

Currently I'm using this function which I've cobbled together from reading several loosely related questions all over the ... } } } } } See Question&Answers more detail:os...

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

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269 views

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c++ - From quaternions to OpenGL rotations

I have an object which I want to rotate via keys. The object should yaw, pitch and roll. After trying a lot ... how to put the things together. See Question&Answers more detail:os...

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

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262 views

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c++ - Compiling error cv::gpu

I'm using OpenCV master branch (3.0.0. dev) with CUDA on Ubuntu 12.04, and trying to compile the following ... API change in Opencv 3.0.0? 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 map move-insertion guarantee that elements are or are not moved from?

The standard "map" containers in C++ allow you to insert an rvalue: T x; std::map<int, T> m; // m[1] ... )); But is this guaranteed to not move? See Question&Answers more detail:os...

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

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