Recent questions tagged C++

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c++ - How to forward declare a member function of a class to use in another class?

I have made two identical classes X and Y, with a pointer to each other. See the code below for X.h, Y.h is ... private: int data; Y *pY; }; 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 do ray plane intersection?

How do I calculate the intersection between a ray and a plane? Code This produces the wrong results. float ... and normal defines the plane 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't I declare a friend through a typedef?

Does anyone know why typedefs of class names don't work like class names for the friend declaration? class A { ... ::SUPERCLASS; // fails }; 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++ - Narrowing conversion to bool in list-initialization - strange behaviour

Consider this piece of C++11 code: #include <iostream> struct X { X(bool arg) { std::cout << arg << ... to question everything at this stage...) 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 can I iterate through a string and also know the index (current position)?

Often when iterating through a string (or any enumerable object), we are not only interested in the current ... track of the current index? 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++ - cURL with Visual Studio 2013

So i have came along with cURL as a very nice library and working very fine in OSX. But on windows now i ... .1. Any help is highly 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++ - Listing the exported functions of a DLL

I'm looking for a way (in C++/Windows) to list the exported functions of a DLL (and maybe even methods ... anybody know which method can do 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 Do I define a Double Brackets/Double Iterator Operator, Similar to Vector of Vectors'?

I'm porting code that uses a very large array of floats, which may trigger malloc failures from c to c++. ... -safe 2D container!! Thanks guys! 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++ - Blob extraction in OpenCV

I'm using OpenCV to filter an image for certain colours, so I've got a binary image of the detected ... that shouldn't restrict things) 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 create exceptions?

So I have an upcoming assignment dealing with exceptions and using them in my current address book program that ... for each error message? 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 compile-time polymorphism and why does it only apply to functions?

What is compile-time polymorphism and why does it only apply to functions? 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't I use fopen?

In the mold of a previous question I asked about the so-called safe library deprecations, I find myself ... something else? Thanks in advance 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 list on-the-fly all the functions/symbols available in C code on a Linux architecture?

Assume main.c uses symbols from shared libs and local functions declared in main.c. Is there a nice and elegant ... loaded to the .code segment. 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 equivalent of Windows' QueryPerformanceCounter on OSX?

I'm porting a library from Windows to *NIX (currently OSX), does anyone now what ... QueryPerformanceCounter and QueryPerformanceFrequency? 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++ - QApplication: How to shutdown gracefully on Ctrl-C

I have a QApplication that, depending on command line parameters, sometimes doesn't actually have a GUI window, but ... . What am I missing? 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++ - Checking whether a number is positive or negative using bitwise operators

I can check whether a number is odd/even using bitwise operators. Can I check whether a number is positive/zero/negative ... in C or 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++ - Contours opencv : How to eliminate small contours in a binary image

I am currently working on image processing project. I am using Opencv2.3.1 with VC++. I have written the code ... image which I want to obtain : 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 ofstream for buffered text output to gain performance

I need to write a program which will write many characters in a output file. My program will also need to ... O and thus can gain performance. 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 this good code? (copy constructor and assignment operator )

For one reason or another, I'm forced to provide both a copy constructor and an operator= for my class. I ... however, is meant to stand alone. 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 implicit sharing?

I am building a game engine library in C++. A little while back I was using Qt to build an application ... simple example of this in action. 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++ - Value-Initialized Objects in C++11 and std::vector constructor

In C++ there are few compelling reasons to use a C array over std::vector. One of those few compelling reasons, at ... malloc) if T is a POD? 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++ - Declare a member-function of a forward-declared class as friend

Is it possible to declare a member function of a forward-declared class as friend? I am trying to do the ... there must be a better solution! 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++ - Visual Studio Code: How to configure includePath for better IntelliSense results

I am a complete beginner to using Visual Studio Code and I have no clue what I am doing. I've ... json to make IntelliSense work properly. 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 different integer types

I was wondering what is the difference between uint32_t and uint32, and when I looked in the header files it had this: ... ; ? I am using MinGW. 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++ - memcpy/memmove to a union member, does this set the 'active' member?

Important clarification: some commenters seem to think that I am copying from a union. Look carefully at the memcpy, ... why we care 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++ - Is the u8 string literal necessary in C++11

From Wikipedia: For the purpose of enhancing support for Unicode in C++ compilers, the definition of the ... -Characters inside the TestString? 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++ - Error: undefined reference to `sqlite3_open'

I'm trying to get started with the C++ API for SQLite. #include <iostream> #include <sqlite3.h> using ... server I'm compiling this in? 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 templates and std::bind

Given the following templated function, how can I change it to take advantage of variadic templates? That is to say, ... ::placeholders::_2)); } See Question&Answers more detail:os...

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

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