Recent questions tagged C++

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c++ - Parsing comma-separated list of ranges and numbers with semantic actions

Using Boost.Spirit X3, I want to parse a comma-separated list of ranges and individual numbers (e.g. ... documentation seems to discourage them. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - OpenSSL ssl_accept() error 5

I have scoured Stack Overflow and the internet, but I have been unable to locate an answer to why ssl_accept() ... this is driving me mad :( See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - branch prediction on a function pointer

I have a loop that is running over and over again. The logic inside that loop is dependent on the mode ... in while in the pipeline? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - C program, that prints its executable file name

Suppose source code file name is test.cpp. When it is compiled, it produce test.exe file. When I execute it, it ... case which is "test.exe"? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How do I reinterpret data through a different type? (type punning confusion)

#include <iostream> int main(int argc, char * argv[]) { int a = 0x3f800000; std::cout << a << std ... , standard-conforming way of doing this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why arguments moved twice when constructing std::thread

Consider this program that essentially creates std::thread that calls the function func() with arg as argument: ... a second move construction? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Assigning string literals to char*

Is the following code legal, deprecated or illegal in C++0x? char* p = "foobar"; I originally asked this question here as a comment. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Apparently identical math expressions with different output

The following code will output different results for variables 'e' and 'f' on a x86 32 bit machine but the ... +a) -930037765265416519680.000... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Class construction with initial values

I'm new to C++, and the whole idea of classes - I'm still reading a book to try and learn. The book I'm ... scale - or is it exactly the same? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Error using a constexpr as a template parameter within the same class

If I try to compile the following C++0x code, I get an error: template<int n> struct foo { }; struct bar ... C++11 standard say it is incorrect? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why do class members have the same address as their object?

In the following cases, each member has a different name or entity so why are their addresses the same? struct B { int ... << &obj << endl; } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Does using SecureZeroMemory() really help to make the application more secure?

There's a SecureZeroMemory() function in WinAPI that is designed for erasing the memory used for storing passwords/ ... better than just use? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Base template class data members are not visible in derived template class?

Consider the following C++ code, template <typename Derived> struct A { bool usable_; }; template <typename Derived> ... that ? Any good fix ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Draw on webcam using OpenCV

I want to draw/paint on a webcam screen using OpenCV. Since I'm reading from a cam, the frames are constantly changing, ... ) { drawing = 1; } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Adding an offset to a pointer

If I have a pointer to an object and I want to get a pointer to an object that is say 16 bytes after ... 0x00000002 how many bytes are skipped? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Keeping console window open when debugging

When I start a program without debugging (Ctrl+F5), I have to press a key to close the console window when the ... 't want to touch the code.) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is an array argument passed to a function not a constant pointer?

Consider the code: void foo(char a[]){ a++; // works fine, gets compiled //... } Now, consider this: void ... declared as: void foo(char a[]); See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Displaying webcam feed in cv::Mat format in a picturebox

I am using OpenCV to take a live stream from a webcam and after detecting faces. I am resizing them so that only ... frame and face are cv::Mat See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why is passing a string literal into a char* argument only sometimes a compiler error?

I'm working in a C, and C++ program. We used to be compiling without the make-strings-writable option. But that ... doesn't... or vice versa... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Is it OK to use "delete this" to delete the current object?

I'm writing a linked list and I want a struct's destructor (a Node struct) to simply delete itself, ... acceptable, especially in this context? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Fastest way of computing the power that a "power of 2" number used?

What would be the quickest way to find the power of 2, that a certain number (that is a power of two) used? ... 32; // should never be called } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - What will be the exact code to get count of last level cache misses on Intel Kaby Lake architecture

I read an interesting paper, entitled "A High-Resolution Side-Channel Attack on Last-Level Cache", and wanted to find ... know how to use them. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - Why does this code produce a warning referring to the comma operator?

When answering this question, I came across this code... #include <iostream> int main() { int const income = ... why the compiler generates it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - using unallocated memory without error?

Why does that work? #include <iostream> using namespace std; int main() { float* tab[3]; int i = 0; ... errors on Windows and not on Linux? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to initialise a member array of class in the constructor?

I am trying to do the following: class sig { public: int p_list[4]; } sig :: sig() { p_list[4] = { ... . So how do I initilalise an array? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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652 views

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c++ - Is it safe to cast an int to void pointer and back to int again?

In C and/or C++: is it safe to cast an int to void pointer and back to int again? Based on the question ... and later back to pointer again?". See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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169 views

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c++ - Evaluating strlen at compilation time?

If my code has this constexpr string constexpr char my_str[] = "hello"; the type of my_str contains information ... this? Surely not "maybe"? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How to overload operator==() for a pointer to the class?

I have a class called AString. It is pretty basic: class AString { public: AString(const char *pSetString = NULL ... *AString with const char*? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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