Recent questions tagged C++

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c++ - Extract high resolution icon or thumbnail for file

I'm trying to get a high resolution icon or thumbnail in Windows given a full path to that file. Doesn't ... anything better than 32x32 ... 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 do we need to set rvalue reference to null in move constructor?

//code from https://skillsmatter.com/skillscasts/2188-move-semanticsperfect-forwarding-and-rvalue-references class Widget { ... .pds = nullptr; 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++ - A way to load DLL from central repository

We have lot of products and there are some common DLLs across each product's application. Right now we copy ... our private directory ] -Kartlee 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 simulate a button click given the handle to the button's window?

I want to simulate a click on a button located in a dialog box. I have the handle to that window. This is an ... as it doesn't suit my needs. 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 does the "::" mean in "::tolower"?

I've seen code like this: std::string str = "wHatEver"; std::transform(str.begin(), str.end(), str.begin( ... not works, but ::tolower works OK 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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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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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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212 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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171 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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326 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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300 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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334 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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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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217 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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255 views

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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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c++ - Resumable assert/breakpoint on iOS like __debugbreak() with MS compiler

I'm trying to implement custom asset macro (similar to what assert.h has), but I want to be able to ... still allow me to continue execution? 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 compile Boost 1.54.0 (1.54) for the iOS simulator (6.1) on OS X 10.8.4?

I have successfully managed to compile several of the Boost libraries and create a framework for use with OS X, ... I'm even attempting 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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224 views

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c++ - C++03 library with C++11 source code

If I have library that was written in C++03 and I compile it to a static library, can I then use it in ... compiler I am using is clang or LLVM See Question&Answers more detail:os...

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

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251 views

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c++ - How to pass std::function with different parameters to same function

I have three functions I'm looking to merge together. Each one takes an std::function as the first ... suggestions would be greatly 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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207 views

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c++ - Is it possible to do an inplace merge without temporary storage?

I was just thinking, if I were to implement std::inplace_merge it would probably look something like this: ... is supposed to come from? See Question&Answers more detail:os...

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

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327 views

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c++ - How do I find all the positions of a substring in a string?

I want to search a large string for all the locations of a string. See Question&Answers more detail:os...

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

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