Recent questions tagged c++

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c++ - will casting around sockaddr_storage and sockaddr_in break strict aliasing

Following my previous question, I'm really curious about this code - case AF_INET: { struct sockaddr_in * tmp = ... with memcpy, is this safe? 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++ - Compiling with -static-libgcc -static-libstdc++ still results in dynamic dependency on libc.so

I'm trying to make an executable that's as portable as possible. After removing a few dependencies, I ... /libgcc_s.so.1 (0x00007f4f41636000) 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 wrong with using inline functions?

While it would be very convenient to use inline functions at some situations, Are there any drawbacks with inline ... to be ignored. -Source 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++ - Significance of parentheses in decltype((c))?

I was reading this article on Wikipedia regarding C++11 Type Inference feature. There is an example and I quote: ... (c) represent an lvalue? 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++ - So can unique_ptr be used safely in stl collections?

I am confused with unique_ptr and rvalue move philosophy. Let's say we have two collections: std::vector<std:: ... me with the aha! moment. 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++ - Are there any tricks to use std::cin to initialize a const variable?

Common std::cin usage int X; cin >> X; The main disadvantage of this is that X cannot be const. It can ... , please let me know in comments). 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++ - Debugging template instantiations

When doing metaprogramming using C++ templates, is there a method that can be used, sort of like a ... investigate and debug template errors? 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++ - Initializing a union with a non-trivial constructor

I have a structure which I create a custom constructor to initialize the members to 0's. I've seen in ... ensure a 0 initialized base element? 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 `constinit` in C++20?

constinit is a new keyword and specifier in C++20 which was proposed in P1143. The following example is ... about constinit in general. 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++ - bool operator ++ and --

Today while writing some Visual C++ code I have come across something which has surprised me. It seems C++ ... hMod = LoadLibrary("xxx"); 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 create my own ostream/streambuf?

For educational purposes I want to create a ostream and stream buffer to do: fix endians when doing << myVar; ... it need to inherit, etc)? 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++ data alignment /member order & inheritance

How do data members get aligned / ordered if inheritance / multiple inheritance is used? Is this compiler specific? ... be ordered / aligned? 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++ - Do rvalue references allow dangling references?

Consider the below. #include <string> using std::string; string middle_name () { return "Jaan"; } int main () ... dangling reference, isn't it? 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++ - Linking to MSVC DLL from MinGW

I'm trying to link the LizardTech GeoExpress DSDK into my own application. I use gcc so that we can compile on ... .libs from g++ 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++ - Template function as a template argument

I've just got confused how to implement something in a generic way in C++. It's a bit convoluted, so ... solution for this class of problems). 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 link using GCC without -l nor hardcoding path for a library that does not follow the libNAME.so naming convention?

I have a shared library that I wish to link an executable against using GCC. The shared library has a ... be hardcoded into the executable? 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 RVO (Return Value Optimization) applicable for all objects?

Is RVO (Return Value Optimization) guaranteed or applicable for all objects and situations in C++ compilers ( ... a specific returned value? 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++ - Segmentation fault at glGenVertexArrays( 1, &vao );

My gdb backtrace gives: (gdb) backtrace #0 0x00000000 in ?? () #1 0x0804a211 in init () at example1.cpp:147 #2 ... ; glutMainLoop(); 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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c++ - What destructors are run when the constructor throws an exception?

In C++, if a constructor throws an exception, what destructors are run? In particular, does it make ... virtual inheritance change anything? 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 a cast operator be explicit?

When it comes to constructors, adding the keyword explicit prevents an enthusiastic compiler from creating an object ... to happen implicitly. 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++ - scale and rotation Template matching

I'm using the method of match template with CV_TM_CCORR_NORMED to compare two images ... I want to make ... result after rotation is different 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 the differences between overriding virtual functions and hiding non-virtual functions?

Given the following code fragment, what are the differences in the function calls? What is function hiding? What is function ... ; cp->doB(); } 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 argument const?

Vector(const Vector& other) // Copy constructor { x = other.x; y = other.y; Why is the argument a 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++ - Function References

So I was just working with function pointers and I remembered that you could do this: void Foo() ... when working with conditional compilation. 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++ - Could I ever want to access the address zero?

The constant 0 is used as the null pointer in C and C++. But as in the question "Pointer to a specific fixed ... that there is not such a need? 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++ - OpenCV CV::Mat and Eigen::Matrix

Is there a reversible way to convert an OpenCV cv::Mat object to an Eigen::Matrix? e.g., Some way of ... a bytes-per-pixel or datasize issue? 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++14 Variable Templates: what is their purpose? Any usage example?

C++14 will allow the creation of variables that are templated. The usual example is a variable 'pi' that can ... and what its purpose is? 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++ - Template typedefs - What's your work around?

C++ 0x has template aliases (sometimes referred to as template typedefs). See here. Current spec of C++ does not. ... Do you feel its worth it ? See Question&Answers more detail:os...

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

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