Recent questions tagged C++

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c++ - virtual function call from base class

Say we have: Class Base { virtual void f(){g();}; virtual void g(){//Do some Base related code;} }; Class ... g() or Derived::g()? Thanks... 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 the difference between cbegin and begin for vector?

The member begin has two overloadings one of them is const_iterator begin() const;. There's also the cbegin ... . What's the difference? 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++ - Intrusive lists

I've not been able to find too much information about them online. What are they and when are they typically used? Thanks. 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++ - unique_ptr to a derived class as an argument to a function that takes a unique_ptr to a base class

I'm trying to use a unique_ptr to derived class in a function that takes a unique_ptr to a base class. ... I'm using Visual Studio 2012. 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: default argument given for parameter 1

I'm getting this error message with the code below: class Money { public: Money(float amount, int moneyType); string ... C++ but it is allowed. 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 use boost normal distribution classes?

I'm trying to use boost::normal_distribution in order to generate a normal distribution with mean 0 and sigma ... before doing the practice. 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++ - Best form for constructors? Pass by value or reference?

I'm wondering the best form for my constructors. Here is some sample code: class Y { ... } class X { ... any of these if they are incorrect. 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 does the implicit copy constructor calls the base class copy constructor and the defined copy constructor doesn't?

Consider a class hierarchy where A is the base class and B derives from A. If the copy constructor is ... constructor as a default behavior? 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++ - Stripping linux shared libraries

We've recently been asked to ship a Linux version of one of our libraries, previously we've developed under ... little success with the answers. 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 (not) to do in a constructor

I want to ask you for your best practices regarding constructors in C++. I am not quite sure what I should do ... . Maybe you can help me out? 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++ - Getting template metaprogramming compile-time constants at runtime

Background Consider the following: template <unsigned N> struct Fibonacci { enum { value = Fibonacci<N-1>::value ... number? 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 do you set GDB debug flag with cmake?

I have tried setting the debug flags using the set command in cmake but I cam unsure what to add. I have been ... find the correct flag to set. 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++ - Forward declarations of unnamed struct

Bounty question: So, these two Foos aren't the same thing. Fine. The second form is given in a library. How do ... darn it! What's wrong here? 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 SOCK_DGRAM and SOCK_STREAM?

I just came across this strange thing I got to see application is that by default they use SOCK_STREAM function ... totally confused over 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++ - Initialize a vector array of strings

Would it be possible to initialize a vector array of strings. for example: static std::vector<std::string> v; ... like we do regular arrays. See Question&Answers more detail:os...

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

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288 views

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c++ - Unused parameter in c++11

In c++03 and earlier to disable compiler warning about unused parameter I usually use such code: #define UNUSED( ... macros? Thanks for all! See Question&Answers more detail:os...

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

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184 views

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c++ - Templates: Use forward declarations to reduce compile time?

I have to deal with a library that consists of many templated classes, which are of course all implemented in ... that I'm actually using. 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++ - CRTP and multilevel inheritance

A friend of mine asked me "how to use CRTP to replace polymorphism in a multilevel inheritance". More ... if there are simpler alternatives. See Question&Answers more detail:os...

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

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211 views

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c++ - CMake one build directory for multiple projects

I′m a beginner user of CMake. My environment has several projects like: project |------ CMakeLists.txt (The ... directory ? Thanks for helping. 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++ - Toggle Switch in Qt

I am trying to use an element which is the equivalent of Android Switches in Qt. I have found a ... to reimplement this widget myself? 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++ - Small logger class

I am looking for a small lightweight logging system in c++. I have found some existing frameworks but I don't ... t want to reinvent the wheel. See Question&Answers more detail:os...

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

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245 views

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c++ - The relationship between auto and decltype

Is auto x = initializer; equivalent to decltype(initializer) x = initializer; or decltype((initializer)) x = initializer; or neither? See Question&Answers more detail:os...

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

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511 views

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c++ - Printing/Debugging libc++ STL with Xcode/LLDB

I'm trying to use LLDB within Xcode 8 to debug very basic STL. I used to be able to print a vector like ... useful output from LLDB with libc++? 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++ - Memset Definition and use

What's the usefulness of the function memset()?. Definition: Sets the first num bytes of the block of memory ... in a VERY simplified way? 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 the difference between auto and decltype(auto) when returning from a function?

I rarely see decltype(auto) but when I do it confuses me because it seems to do the same thing as ... difference between these two syntaxes? See Question&Answers more detail:os...

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

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562 views

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c++ - Problem to Decode H264 video over RTP with ffmpeg (libavcodec)

I set profile_idc, level_idc, extradata et extradata_size of AvCodecContext with the profile-level-id et sprop-parameter- ... is the problem ? See Question&Answers more detail:os...

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

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209 views

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c++ - What is the best smart pointer return type for a factory function?

With respect to smart pointers and new C++11/14 features, I am wondering what the best-practice return values and ... characters. "; return 0; } See Question&Answers more detail:os...

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

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257 views

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c++ - std::atomic | compare_exchange_weak vs. compare_exchange_strong

I'm unsure if it's me not understanding or the documentation isn't clearly formulated. The following excerpt has been ... &__i1, __i2, __m1); } See Question&Answers more detail:os...

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

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