Recent questions tagged C++

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Ive looked online and have not been able to satisfy myself with an answer. Is memcpy threadsafe? (in Windows) What ... can I read about 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++ - Wrapping C create and destroy functions using a smart pointer

I have some C API that handles object creation and destruction, it provides: createObject(...) and destroy( ... counting in this situation? 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++ - Programmatically get Google search results

How can I get Google search results from inside a program? I need to get an array of search results for a specified 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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c++ - How to correctly determine character encoding of text files?

Here is my situation: I need to correctly determine which character encoding is used for given text file. ... hint will 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++ - std::begin and std::end not working with pointers and reference why?

Why std::begin() and std::end() works with array but not pointer[which is almost array] and reference of array [ ... std::end(*second)) { ^ 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++ - Algorithm to find a duplicate entry in constant space and O(n) time

Given an array of N integer such that only one integer is repeated. Find the repeated integer in O(n) time ... it before the array is immutable 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++ - Preprocessor macro expansion to another preprocessor directive

Initially I thought I needed this, but I eventually avoided it. However, my curiosity (and appetite for ... class FooTemplate<MyClass>; ? 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 way of portably timing code using C++11

I'm in the midst of writing some timing code for a part of a program that has a low latency requirement. ... what would be the best option? 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 it OK for function prototypes and function implementation signatures to use const inconsistently?

I like to declare even value parameters as const where possible, and by searching SO, I found that that's not ... 't leave out const either? 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 floating calculation and casting shows different result in debug and release configuration?

This is really a weird bug to me and it took me long time to figure out what's happening. To simplify ... different value in debug/release mode? See Question&Answers more detail:os...

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

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751 views

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c++ - sws_scale YUV --> RGB distorted image

I want to convert YUV420P image (received from H.264 stream) to RGB, while also resizing it, using ... size); sws_freeContext(img_convert_ctx); 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++ - Create a shared-memory vector of strings

I am trying to create a class managing a shared-memory vector of (std)strings. typedef boost::interprocess:: ... in shmem may be different. 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++ - Initialization of std::vector<unsigned int> with a list of consecutive unsigned integers

I want to use a special method to initialize a std::vector<unsigned int> which is described in a C++ book I ... do I force that it is called? 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++ - Class members allocation on heap/stack?

If a class is declared as follows: class MyClass { char * MyMember; MyClass() { MyMember = new char[250]; ... to allocate class members on heap? See Question&Answers more detail:os...

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

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249 views

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c++ - What is it called when a block returns a value?

I came across this code recently, which doesn't look legal to me (but gcc compiles it). I don't so ... to plain C called Statement Expressions. See Question&Answers more detail:os...

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

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388 views

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c++ - How to write a std::bitset template that works on 32 and 64-bit

Consider the following code template<unsigned int N> void foo(std::bitset<N> bs) { /* whatever */ } ... interpretation of a numeric literal is? See Question&Answers more detail:os...

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

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240 views

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c++ - How to check if interface is up

Title pretty much says it all. If I run ifconfig, I get this: eth0: flags=4163<UP,BROADCAST,RUNNING, ... the correct direction for 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++ - Lambda Captures C++14

I've encountered a notation like: int x = 4; auto y = [&r = x, x = x+1]()->int { r += 2; ... starts C++14 and encountered this snippet. 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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163 views

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c++ - How to compile a program using OpenCV 2.4.3 with Code::Blocks?

I've installed Code::Blocks with MinGW and OpenCV 2.4.3. I want to compile this simple program: #include ... have installed OpenCV in c:opencv. 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++ - Checkbox in a header cell in QTableView

I want to have a simple column header with a checkbox that selects/ deselects all rows in a QTableView. ... or QHeaderView for this purpose) 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++ - Creating a large array of numbers (10^9 size)

I want to create an array that is capable of storing 10^9 numbers(long int).If i try doing this my ... Thanks, 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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297 views

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c++ - Returning Strings from DLL Functions

For some reason, returning a string from a DLL function crashes my program on runtime with the error Unhandled ... the same options, etc. See Question&Answers more detail:os...

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

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322 views

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c++ - Avoid angle brackets in default template

If I have a template class with a default template type, I have to write the template angle brackets. Is it somehow ... which I didn't see yet. See Question&Answers more detail:os...

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

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312 views

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c++ - How to store persistent handles in V8?

I want my class to hold a v8::Context and a v8::External as members. Therefore, I thought I had ... for methods that return persistent handles. 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 "const LPVOID" equivalent to "void * const"?

And if so, why some Win32 headers use it? For instance: BOOL APIENTRY VerQueryValueA( const LPVOID pBlock, LPSTR ... so quite some time ago. 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++ - Stitching 2 images in opencv

I'm trying to stitch 2 images just for start for panography. I"ve already found keypoints, found homography using ... ; and it's working now See Question&Answers more detail:os...

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

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471 views

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c++ - Can I use Thread Sanitizer for OpenMP programs?

Consider the following example: #include <iostream> int main () { int i = 0; #pragma omp parallel { #pragma omp ... libomp would be fine 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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304 views

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c++ - fastest technique to read a file into memory?

Is there a generally-accepted fastest technique which is used to read a file into memory in c++? I will only ... 1GB and this is for 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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