Recent questions tagged C++

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c++ - Compile a Qt project from command Line

I am developing a application using Qt, the C++ library/framework. Using the QT-Creator I can compile my project ... where I am going 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++ - What is a long pointer?

I am reading a book and it mentions certain data type as being long pointer. Just curious about what that meant. 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++ - Why do I need to delete[]?

Lets say I have a function like this: int main() { char* str = new char[10]; for(int i=0;i< ... good practice? Does it have deeper consequences? 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 execution policies and when to use them

I noticed that a majority (if not all) functions in <algorithm> are getting one or more extra overloads. All of ... to use one or the other? 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 let cmake find CUDA

I am trying to build this project, which has CUDA as a dependency. But the cmake script cannot ... I Specify CUDA_TOOLKIT_ROOT_DIR correctly? 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++ - Where does the value of CXX in a makefile come from?

Code Snippet: target_test : test.cc $(CXX) $(CPPFLAGS) $(CFLAGS) test.cc I know that CXX is a variable ( ... where the value of CXX comes 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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c++ - Move semantics and function order evaluation

Suppose I have the following: #include <memory> struct A { int x; }; class B { B(int x, std::unique_ptr<A> ... (int)? Would that help? 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++ - How do I programmatically get the free disk space for a directory in Linux

Is there a function that returns how much space is free on a drive partition given a directory path? 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 the most efficient way to append one std::vector to the end of another?

Let v1 be the target vector, v2 needs to be appended to the back of it. I'm now doing: v1.reserve(v1. ... via copying a chunk of memory? 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++ - GNU compiler warning "class has virtual functions but non-virtual destructor"

I have defined an interface in C++, i.e. a class containing only pure virtual functions. I want to ... can be safely ignored or silenced? 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 call qDebug without the appended spaces and newline?

I'm using the the C++/Qt print function qDebug, but sometimes I would like to control how ", space and ... rid of the ending newline. /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++ - Multi-line DEFINE directives?

I am not an expert, so go easy on me. Are there any differences between these two code segments? #define BIT3 (0x1 < ... 0x1 << 3) static int a; 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 don't I need to specify "typename" before a dependent type in C++20?

This bit of code compiled in C++20 (using gcc 10.1) without using the typename keyword before the dependent type ... &f<int>; } code playground 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 good practice to make getters and setters inline?

public: inline int GetValue() const { return m_nValue; } inline void SetValue(int nNewValue) { this -> m_nValue = ... are some drawbacks to 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++ - For loop inside its own curly braces

I have come across this for-loop layout: #include <iostream> int main() { { for (int i = 0; i != 10; ... appears a few times in our code base. 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 debug cocos2d-x 3 native code on android device

I could not find any cookbook/tutorial how build in debug build a cocos2d-x 3.1 project for Android and how ... Android NDK: Aborting. . Stop. 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's the difference between void* and void**?

It's the special property that void* can also be assigned a pointer to a pointer and cast back and the original ... what's void** needed for? 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++ - g++ compiler flag to minimize binary size

I'm have an Arduino Uno R3. I'm making logical objects for each of my sensors using C++. The Arduino ... size, which is prompting my concern. 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++ - c++11 async continuations or attempt at .then() semantics

The code below is based on Herb Sutter's ideas of an implementation of a .then() type continuation. template<typename ... a thread (maybe))). 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++ - Okay to declare static global variable in .h file?

static keyword keeps the scope of a global variable limited to that translation unit. If I use static int x in a .h ... a for loop in the file? 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 a Cubemap into Equirectangular Panorama

I want to convert from cube map [figure1] into an equirectangular panorama [figure2]. Figure1 Figure2 It is ... into a sphere using Unity. 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++ - Variadic variadic template templates

I'm currently struggling with the following code, the intent of which is to implement variadic variadic template templates: ... with gcc 4.5.1. 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++ - Pass a JavaScript array as argument to a WebAssembly function

I would like to test WebAssembly for doing some complex array calculations. So I've written a simple C++ function ... my C++ ignorance ... 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++ - Where can I find all the exception guarantees for the Standard Containers and Algorithms?

Yes, I've looked at the C++ standards that I could find (or the drafts), but I'm not finding any ... can more or less treat as official. 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 is programming an Arduino different than standard C?

I have a background in programming embedded systems (TI MSP430, Atmel ATxmega). How is programming an Arduino ... to programming the Arduino? 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 g++ look in LIBRARY_PATH/../lib64 and where is this documented?

My LIBRARY_PATH environment variable has a custom directory in it: /cs/public/lib/pkg/opencv/lib. But, when I use ... is openSUSE 12.1 (x86_64) 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's better to use, a __try/__except block or a try / catch block?

I'm wondering which is the better way to catch exceptions that I throw: is it a __try / __except block or ... is not an issue. 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++ - Function template specialization format

What is the reason for the second brackets <> in the following function template: template<> void doh::operator()<> ... > void operator()(int i) See Question&Answers more detail:os...

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

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