Recent questions tagged C++

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c++ - multiple definition of template specialization when using different objects

When I use a specialized template in different object files, I get a "multiple definition" error when ... any further explanation. Thanks 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 idiomatic way in CMAKE to add the -fPIC compiler option?

I've come across at least 3 ways to do this and I'm wondering which is the idiomatic way. This needs ... a shared object; recompile with -fPIC 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++ - Difference between rdtscp, rdtsc : memory and cpuid / rdtsc?

Assume we're trying to use the tsc for performance monitoring and we we want to prevent instruction reordering. ... option over the 2nd option? 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++ - Default, value and zero initialization mess

I am very confused about value- & default- & zero-initialization. and especially when they kick in for the ... on its first declaration. 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++ - Run an Application in GDB Until an Exception Occurs

I'm working on a multithreaded application, and I want to debug it using GDB. Problem is, one of my threads ... that I can get a backtrace. 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++ - When should I use raw pointers over smart pointers?

After reading this answer, it looks like it is a best practice to use smart pointers as much as possible, and to ... to minimum. Is that true? 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 convert string to IP address and vice versa

how can I convert a string ipAddress (struct in_addr) and vice versa? and how do I turn in unsigned long ipAddress? thanks 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 make an expandable/collapsable section widget in Qt

I would like to create a custom widget in Qt with the following features: It is a container It may be populated ... }; } #endif // SECTION_HPP 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 some people use swap for move assignments?

For example, stdlibc++ has the following: unique_lock& operator=(unique_lock&& __u) { if(_M_owns) unlock(); ... :swap on each member) 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 draw text using only OpenGL methods?

I don't have the option to use but OpenGL methods (that is glxxx() methods). I need to draw text using gl ... is any other way to draw text? 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++ - Iterative DFS vs Recursive DFS and different elements order

I have written a recursive DFS algorithm to traverse a graph: void Graph<E, N>::DFS(Node n) { std::cout ... I doing something wrong? 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++ - How to overload the operator++ in two different ways for postfix a++ and prefix ++a?

How to overload the operator++ in two different ways for postfix a++ and prefix ++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++ - How define an array of function pointers in C

I've a little question. I'm trying to define an array of function pointers dynamically with calloc. But I don't ... the syntax. Thanks a lot. 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 are declarations and declarators and how are their types interpreted by the standard?

How exactly does the standard define that, for example, float (*(*(&e)[10])())[5] declares a ... "? Inspired by discussion with @DanNissenbaum 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++ - Most optimized way of concatenation in strings

We always came across many situation on daily basis wherein we have to do tedious and very many string operations ... CString over std::string? 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 use glOrtho() in OpenGL?

I can't understand the usage of glOrtho. Can someone explain what it is used for? Is it used to set the range of x ... z range is from -1 to 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++ - How to tell where a header file is included from?

How can I tell where g++ was able to find an include file? Basically if I #include <foo.h> g++ ... including defaults and all include options? 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++ - Passing shared pointers as arguments

If I declare an object wrapped in a shared pointer: std::shared_ptr<myClass> myClassObject(new myClass()); then ... about it. 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++ - Why do we copy then move?

I saw code somewhere in which someone decided to copy an object and subsequently move it to a data member of a ... When should I do this myself? 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 lambda functions be templated?

In C++11, is there a way to template a lambda function? Or is it inherently too specific to be ... language allow templating lambda functions? 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++ - Pimpl idiom vs Pure virtual class interface

I was wondering what would make a programmer to choose either Pimpl idiom or pure virtual class and inheritance. ... than the pimpl idiom? 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 'thunk'?

I've seen it used in programming (specifically in the C++ domain) and have no idea what it is. Presumably it ... a good example of a thunk? 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++ - std::string length() and size() member functions

I was reading the answers for this question and found that there is actually a method called length() for std:: ... for the user of the class? 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 "#pragma comment" mean?

What does #pragma comment mean in the following? #pragma comment(lib, "kernel32") #pragma comment(lib, "user32") 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 boost::function and boost::bind work

I dislike having magic boxes scattered all over my code...how exactly do these two classes work to allow basically ... to be compatible with C. 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++ - Qt events and signal/slots

In the Qt world, what is the difference of events and signal/slots? Does one replace the other? Are events an abstraction of signal/slots? 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++ - std::auto_ptr to std::unique_ptr

With the new standard coming (and parts already available in some compilers), the new type std::unique_ptr is ... improve the std::auto_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++ - What exactly does stringstream do?

I am trying to learn C++ since yesterday and I am using this document:http://www.cplusplus.com/files/tutorial ... new to programming) 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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