Recent questions tagged C++

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c++ - How to implement an function equivalent to bwmorph Matlab function in OpenCV

I want to implement bwmorph(image,'endpoints') function in OpenCV. I checked out its Matlab source code. It uses a ... in C++ using OpenCV?? 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++ - preferred cmake project structure

I would like to have the following structure A -> B -> C, where: C is boilerplate code, wrappers ... the parent component using X_INCLUDE_DIRS. 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++ - Netbeans and MinGW-w64

I'm trying to configure my NetBeans on win7 64bit, to work with the MinGW-w64. So I put in the %PATH% variable ... .7.0 what am I missing? 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++ - QScrollArea with dynamically changing contents

I have a QScrollArea with some buttons in it, like shown on the picture. The idea of the ... 0B-mc4aKkzWlxQzlPMEVuNVNKQjg/edit?usp=sharing 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 lambda functions drop deduced return type reference by default?

In C++14, why do lambda functions with a deduced return type drop references from the return type by default? IIUC, ... Xcode 8, clang 8.0.0) 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++ - Counting the number of occurrences of a string within a string

What's the best way of counting all the occurrences of a substring inside a string? Example: counting ... of Foo inside FooBarFooBarFoo 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++ - Extract cursor image in Java

I was wondering if there is a way to extract an Image object from a Cursor object in Java. A use for this would ... the purpose I want it for). 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++ - Glut deprecation in Mac OSX 10.9, IDE: QT Creator

I was trying to build an opengl program on qt creator, installed on my mac, with osx 10.9. I got several ... do so in qtcreator? Thank you! 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++ - Read from QTcpSocket using QDataStream

I need to send binary data through a QTcpSocket. I was thinking about using QDataStream, but I've encountered a ... tell it to block 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++ - Does copy list initialization invoke copy ctor conceptually?

Before C++11, we can do copy initialization by writing something like A a = 1; which is more or less equivalent ... do not stay in the way. 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 read BMP pixel values into an array?

I'm writing code in C++ (on Windows) and I'm trying to extract the pixel values of a grayscale bmp. ... bitmaps into memory. 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++ - Conversion from int** to const int**

Why do I get in this code: void foo ( const int ** ); int main() { int ** v = new int * [10] ... be possible to convert from non-const to const. 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++ - request for member `...' is ambiguous in g++

I'm getting the following compile error in one of my classes, using gcc 3.4.5 (mingw): src/ModelTester ... ::IListener<SControlPacket const&>*)' 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 the point of using std::ios_base::binary?

I had a issue with Linux file reading under Window. Here is the issue discussion: Using fstream::seekg under ... fstream::seekg always work? See Question&Answers more detail:os...

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

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384 views

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c++ - Optimization of raw new[]/delete[] vs std::vector

Let's mess around with very basic dynamically allocated memory. We take a vector of 3, set its elements and ... the raw memory allocation case? See Question&Answers more detail:os...

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

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415 views

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c++ - Lifetime of object is over before destructor is called?

I don't understand this: 3.8/1 "The lifetime of an object of type T ends when: - if T is a ... clear what's allowed during the destructor. 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 split a string by a delimiter into an array?

I am new to programming. I have been trying to write a function in C++ that explodes the contents of a ... variable with some sort of indexing. 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++ - forward declaration with vector of class type - pointer to incomplete class type not allowed

I have two classes, foo and bar. foo.h #includes bar.h and contains a std::vector of pointers to bar ... in foo later on. Any suggestions? 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 add zlib to an existing qt installation

How can I add zlib to an existing installation of Qt. I m pretty new in this so please give me detailed ... Thanks for your help 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++ - How do I make an image resize to scale in Qt?

I made a class called ImageLabel which extends QLabel. I want it to keep the size ratio of the image that it is ... (); return a.exec(); } 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 we need virtual table?

I was looking for some information about virtual table, but can't find anything that is easy to understand. ... with explanations, or links? See Question&Answers more detail:os...

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

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866 views

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c++ - How can I cin and cout some unicode text?

I ask a code snippet which cin a unicode text, concatenates another unicode one to the first unicode text and the ... . How I should do that? 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 avoid errors while using CRTP?

Using CRTP sometimes I write a code like this: // this was written first struct Foo : Base<Foo, .. ... 0x features and MSVC language extensions) 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++ - Can different GCC dialects be linked together?

I know that in principle this is probably undefined behaviour, but in the interest of dealing with a large project, here's ... 4.2.2 and 4.6. 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 the copy constructor called when we pass an object as an argument by value to a method?

Why is the copy constructor called when I pass an object as an argument by value to a function? Please see my ... display(obj); return 0; } See Question&Answers more detail:os...

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

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669 views

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c++ - How to draw a point (on mouseclick) on a QGraphicsScene?

I have the following code to set up a QGraphicsScene. I wish to click on the scene and draw a point at the ... 350); view->setScene(scene); } See Question&Answers more detail:os...

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

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498 views

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c++ - should std::common_type use std::decay?

Given types A,B, I am concerned with the exact definition of std::common_type<A,B>, disregarding the variadic ... just use my own definitions? 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 safe to reinterpret_cast an enum class variable to a reference of the underlying type?

I've seen reinterpret_cast used to apply incrementation to enum classes, and I'd like to know if this usage is ... in all compilers. Any clues? See Question&Answers more detail:os...

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

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