Recent questions tagged C++

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c++ - GLSL: Replace large uniform int array with buffer or texture

Right now I am trying to pass an array of ints into the fragment shader, and am doing this through a ... Could anyone supply such 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++ - Why do we need "this pointer adjustor thunk"?

I read about adjustor thunk from here. Here's some quotation: Now, there is only one QueryInterface method, but ... user's pointer of view. 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++ - Hourglass sum in 2D array

We are given a (6*6) 2D array of which we have to find largest sum of a hourglass in it. For ... ://www.hackerrank.com/challenges/2d-array 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++ - std::function template argument resolution

I am currently working on a library where I am chaining function objects. I am creating a function template ... template function? Thank you. 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++ - Unpacking arguments from tuples

So I'm trying to figure out how this works: C++11: I can go from multiple args to tuple, but can ... construct applies to both types and values. 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++ - "non-standard syntax; use '&' to create a pointer to member" error in Visual Studio 2015

I have this function: std::string Room::getUsersAsString(std::vector<User*> usersList, User * excludeUser) { std:: ... member How can I fix 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++ - How to monitor a folder with all subfolders and files inside?

I have a folder called "Datas". This folder has a subfolder called "Inbox" inside of which there are multiple ". ... not know how to solve 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++ - Function try blocks, but not in constructors

just a quick question. Is there any difference between void f(Foo x) try { ... } catch(exception& e) { ... ... exception when x is passed to 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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c++ - How to convert from wchar_t to LPSTR?

How can I convert a string from wchar_t to LPSTR. 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++ - Save argv to vector or string

I need to save all arguments to a vector or something like this. I'm not a programmer, so I don't know how to do ... *All Argv**); } return 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++ - OpenCV 3.0.0 "configure" fails, ffmpeg not downloaded

I get the following error when trying to configure OpenCV using CMAKE on windows: CMake Warning at cmake/OpenCVUtils. ... , how to fix that? 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++ - Determine if O/S is Windows 7

Working on a project and need to be able to determine whether the O/S is Windows 7, Vista or default ... en-us/library/ms724358%28VS.85%29.aspx 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 Anything Like a Templatized Case-Statement

So I have this really ugly code: template <typename T> std::conditional_t<sizeof(T) == sizeof(char), char ... Casts between Same-Sized Types? 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++ - find overlapping rectangles algorithm

let's say I have a huge set of non-overlapping rectangle with integer coordinates, who are fixed once and for ... are all parallel to the axis 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++ - How to specify compiler flag to a single source file with qmake?

While other source files use the default flags? Some of my source files need some extra C++ preprocessor ... global use in qmake projects. See Question&Answers more detail:os...

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

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643 views

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c++ - Convert 16-bit-depth CvMat* to 8-bit-depth

I'm working with Kinect and OpenCV. I already search in this forum but I didn't find anything like my problem. I ... in an 8-bit-depth-CvMat* ? 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++ - cuda shared library linking: undefined reference to cudaRegisterLinkedBinary

Goal: create a shared library containing my CUDA kernels that has a CUDA-free wrapper/header. create a test ... cudaMemcpy (same as above) 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 boost fusion map field name

I've been trying to use some of the boost fusion stuff to write a regular c struct to file. An XML ... else might I accomplish this? 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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228 views

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c++ - g++ 4.7.1 compilation error : conflicting types for ‘strsignal’

I'm trying to compile g++ 4.7.1 from source on Ubuntu 12.04 32 bits. For the moment I've exactly done ... char *strsignal (int); # endif #endif 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 using the same count variable name in nested FOR loops work?

Why does the following not give an error? for (int i=0; i<10; ++i) // outer loop { for (int i= ... 't I get an error about multiple definitions? 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++ - "Dual-target" MinGW-w64 isn't really dual-target?

When I try to compile a 32-bit program on a 64-bit host with MinGW-builds: T:mingw64>.ing++ -m32 Test.cpp I get: t: ... 8.0/../../../../x86_64-w64-mingw32/liblibgcc_s.a when searc...

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

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297 views

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c++ - Is the address of a reference to a dereferenced pointer the same as the address of the pointer?

In C++, is the address of a reference to a dereferenced pointer guaranteed to be the same as the address of the ... *ptr; assert(&ref == ptr); 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++ - Assigning this pointer to rvalue reference to a pointer

Should the following sample compile? struct B; struct A { A(B*&&){} }; struct B : A { B() : A(this){ ... . BUGS FILED MSVC bug link GCC bug link 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++ - Avoiding default construction of elements in standard containers

I'm interested in building an uninitialized_vector container, which will be semantically identical to std::vector with the ... to c++11. See Question&Answers more detail:os...

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

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703 views

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c++ - How to properly hash the custom struct?

In the C++ language there is the default hash-function template std::hash<T> for the most simple types, like ... and map them back to size_t? 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++ - How to use multiple source files to create a single object file with gcc

I'm using the -c option with g++ to create a bunch of object files, and it's only letting me specify one ... Is there any way 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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302 views

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c++ - implementing operator== when using inheritance

I have a base class which implements the == operator. I want to write another class, inheriting the base class ... solve this problem ? 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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222 views

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c++ - how to specify alternate linker command when linking with 'cc'

When you use cc(1) to link a program, it will invoke a default linker command. For instance, your version of ... seems to solve the issue well. See Question&Answers more detail:os...

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

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