Recent questions tagged C++

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c++ - Difference between `const shared_ptr<T>` and `shared_ptr<const T>`?

I'm writing an accessor method for a shared pointer in C++ that goes something like this: class Foo { public: ... if I got it wrong. 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++ - What does iterator->second mean?

In C++, what is the type of a std::map<>::iterator? We know that an object it of type std::map<A,B>: ... value stored in the map as it->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++ - What are the differences between concepts and template constraints?

I want to know what are the semantic differences between the C++ full concepts proposal and template ... template constraints cannot do? 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 are VST Plugins made?

I would like to make (or learn how to make) VST plugins. Is there a special SDK for this? how does one yield ... Pro, how is that done? 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++ - What are coroutines in C++20?

What are coroutines in c++20? In what ways it is different from "Parallelism2" or/and "Concurrency2" (look ... /img/wg21-timeline-2017-03.png 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 are some best practices for OpenGL coding (esp. w.r.t. object orientation)?

This semester, I took a course in computer graphics at my University. At the moment, we're starting to ... best practices for OpenGL coding? 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++ - Reference member variables as class members

In my place of work I see this style used extensively:- #include <iostream> using namespace std; class A { ... any pitfalls to this approach? 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 an instance of class

What's the difference between lines 1 , 2 , 3 , 4? When do I use each? Why line 3 prints the constructor Foo and ... Foo::Foo() ); return 1; } 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 do I clear the std::queue efficiently?

I am using std::queue for implementing JobQueue class. ( Basically this class process each job in FIFO manner). In one ... { m_Queue.pop(); } } 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::map insert or std::map find?

Assuming a map where you want to preserve existing entries. 20% of the time, the entry you are inserting is new ... was or was not inserted? 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++ - 64-bit version of Boost for 64-bit windows

Is there a version of 64-bit Boost library for VS2008 ? Or do I have to compile one myself? if, so, does anyone have experience with 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++ - std::vector performance regression when enabling C++11

I have found an interesting performance regression in a small C++ snippet, when I enable C++11: #include <vector> ... elapsed ( +- 0.80% ) 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++ - Difference between using Makefile and CMake to compile the code

I code on C/C++ and use a (GNU) Makefile to compile the code. I can do the same with CMake and get ... Makefile and CMake to compile the code? 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 detect a Christmas Tree?

Which image processing techniques could be used to implement an application that detects the Christmas trees displayed in ... in these images? 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 random header not importing

I have written code in C++ and compiled it by typing make. An error occurs: /usr/include/c++/4.8/bits/c+ ... or -std=gnu++11 compiler options. 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 CreateProcess() and exit/close the opened Application

I am building a program that would open Sublime text and after a period of time would close the ... ::CloseHandle(piProcessInfo.hProcess); 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 __gcd() is throwing error in macOS mojave?

#include <iostream> #include <vector> #include <algorithm> #include <numeric> using namespace std; int main() { int n; ... gcd(a, b) works. 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++ - Sorting packed vertices with thrust

So I have an device array of PackedVertex structs: struct PackedVertex { glm::vec3 Vertex; glm::vec2 UV ... 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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c++ - Why can you add an integer to a string literal?

I was messing around and noticed something strange. You can actually do "a" + 2 and the program compiles ... subscript is above array bounds. 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++ memory error when using malloc/realloc/free on std::string

I wrote a small piece of code like this: template <class T> void test() { T* ptr = nullptr; ptr = (T*)malloc(1 ... ++ 6.2.1 and valgrind 3.12.0 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++ - About the exclusiveness of the cases of an if block

I have a question about good coding practices. I understand the differences between doing an if-else if and ... clunky and counter-intuitive. 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++ - Writting in text file error, QT

I have this code in QT c++ void writeInFile() { QFile file(":/texts/test.txt"); if(file.open(QIODevice:: ... mode. Any help or advice welcome. 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 move double in %rax into particular qword position on %ymm or %zmm? (Kaby Lake or later)

The idea is that I'd like to collect returned values of double into a vector register for processing for ... instructions are welcome also. 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 my program's memory not release?

#include <iostream> #include <string> #include <deque> #include <vector> #include <unistd.h> using namespace std; struct ... GCC) 4.9.1, centos 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++ - method in the derived class got executed without a *virtual* keyword in the referred class

class vehicle { public: virtual void drive() { cout<<"in vehicle drive"<<endl; } }; class bus:public vehicle ... where am I missing the point? 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 high-order of uint64_t while shifting and masking 32-bit values

I have some undefined behaviour in a seemingly innocuous function which is parsing a double value from a buffer ... two solutions is preferable? 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++ - Multi-dimensional array

I need to create a function that has a parameter which is a multi-dimensional array with two dimensions being user- ... do that in C++ ? 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++ - sizeof character array for a dynamically created array

I need to create a char array dynamically based on the pattern length, i.e., plen. However, when I do ... has the stored value of pattern. See Question&Answers more detail:os...

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

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