Recent questions tagged C++

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c++ - Disabling Warnings generated via _CRT_SECURE_NO_DEPRECATE

What is the best way to disable the warnings generated via _CRT_SECURE_NO_DEPRECATE that allows them to be ... Visual Studio versions? 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++ - SVM classifier based on HOG features for "object detection" in OpenCV

I have a project, which I want to detect objects in the images; my aim is to use HOG features. By using ... , I need help solving this problem. 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++11: Replace all non-owning raw pointers with std::shared_ptr()?

With the advent of std::unique_ptr, the blemished std::auto_ptr can finally be put to rest. So for the last ... should also be std::shared_ptr? 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++ - string::size_type instead of int

const std::string::size_type cols = greeting.size() + pad * 2 + 2; Why string::size_type? int is supposed to work! it holds numbers!!! 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 members and explicit stack/heap allocation

Let's say we have 4 classes as follows: class A { public: A(void) : m_B() { } private: B m_B; } class ... this in detail I would love a link. 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 can I pass std::unique_ptr into a function

How can I pass a std::unique_ptr into a function? Lets say I have the following class: class A { public: A(int ... (unique_ptr<A>(new A(1234))); 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 does iota of std::iota stand for?

I'm assuming the "i" is increment and the "a" is assign, but I could not figure out or find the ... standard itoa which I think is confusing. 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 support both IPv4 and IPv6 connections

I'm currently working on a UDP socket application and I need to build in support so that IPV4 and IPV6 ... BSD sockets. Thanks in advance! 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 is the recommended way to align memory in C++11

I am working on a single producer single consumer ring buffer implementation.I have two requirements: Align a ... version of eglibc/glibc. 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 multiple executables in CMake

My code in a C++ project is organised as follows I have several .cpp and .h files which contains my classes I have ... , how do I go about 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++ - How to disallow temporaries

For a class Foo, is there a way to disallow constructing it without giving it a name? For example: Foo("hi ... get a compile time error instead. 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 does a sentinel node offer benefits over NULL?

On the Sentinel Node wikipedia page it says that the benefits of a sentinel node over NULL are : Increased speed of ... in (for example) a list? 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 libstdc++ compiled libraries with clang++ -stdlib=libc++

I am working in C++ under Mac OS X (10.8.2) and I recently came up with the need of using C++11 ... (e.g. by using some preprocessors flags?) 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 is the purpose of the "final" keyword in C++11 for functions?

What is the purpose of the final keyword in C++11 for functions? I understand it prevents function overriding by ... thing I'm missing here? 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++ - Memory alignment : how to use alignof / alignas?

I work with shared memory right now. I can't understand alignof and alignas. cppreference is unclear : alignof ... clearly alignof and alignas ? 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++ - Improve matching of feature points with OpenCV

I want to match feature points in stereo images. I've already found and extracted the feature points with different ... : (source: codemax.de) 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++ - Example to use shared_ptr?

Hi I asked a question today about How to insert different types of objects in the same vector array and my ... don't understand the syntax! 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 does the main() method work in C?

I know there are two different signatures to write the main method - int main() { //Code } or for ... two different signatures of main function? 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 can I get the maximum or minimum value in a vector?

How can I get the maximum or minimum value in a vector in C++? And am I wrong in assuming it would be more or ... of non-class type int [10]' 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++ - Removing watermark out of an image using OpenCV

First of all I have this image and I want to make an application that can detect images like it and ... suggestions? These are the results: 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 does -fPIC mean when building a shared library?

I know the '-fPIC' option has something to do with resolving addresses and independence between individual modules, ... means. Can you explain? 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++ - Should one never use static inline function?

There are two implications of using the inline keyword(§ 7.1.3/4): It hints the compiler that ... on a function practically useless? 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 can I determine distance from an object in a video?

I have a video file recorded from the front of a moving vehicle. I am going to use OpenCV for object ... from the camera to the object. 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++ - Where would you use a friend function vs. a static member function?

We make a non-member function a friend of a class when we want it to access that class's private members. ... (you would call create_foo())? 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 is a good random number generator for a game?

What is a good random number generator to use for a game in C++? My considerations are: Lots of random ... anyone have any input about 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++ - How should one use std::optional?

I'm reading the documentation of std::experimental::optional and I have a good idea about what it does, but I ... previous Standard (C++11). 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 is the difference between include_directories and target_include_directories in CMake?

I have a directory structure for my C++ code which goes like this : | |->include |->src I am writing a ... path which one should I be using? 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++ - STL or Qt containers?

What are the pros and cons of using Qt containers (QMap, QVector, etc.) over their STL equivalent? I can ... application already relies on Qt. See Question&Answers more detail:os...

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

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