Recent questions tagged C++

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c++ - Clean Eclipse Index, it is out of sync with code

I'm using Eclipse with C++ code via linked resources on Linux. The code analysis index seems to be corrupted ... the index and rebuild 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++ - Fastest way to get the integer part of sqrt(n)?

As we know if n is not a perfect square, then sqrt(n) would not be an integer. Since I need only the ... write the code in asm block also. 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 branches with undefined behavior be assumed unreachable and optimized as dead code?

Consider the following statement: *((char*)NULL) = 0; //undefined behavior It clearly invokes undefined behavior ... according to the standard? 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 "Additional Include Directories"

In configuration properties of my project, under the "VC++ directories" there is an entry for "Include ... between these two entries? 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 get position of a certain element in strings vector, to use it as an index in ints vector?

I am trying to get the index of an element in a vector of strings, to use it as an index in another vector ... since pos is of type 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++ - throw new std::exception vs throw std::exception

while looking at some code I stumbled onto: throw /*-->*/new std::exception ("//... and I always thought ... that uses throw gcnew. Is that OK? 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 write the keyword 'static' before a non-member function?

I've recently seen a bit on SO about the static keyword before a function and I'm wondering how to use it ... (only when you include 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++ - Format specifiers for uint8_t, uint16_t, ...?

If I have an integer variable I can use sscanf as shown below by using the format specifier %d. sscanf ... uint64_t? uint64_t has probably %lu. 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 break when a specific exception type is thrown in GDB?

According to the documentation I can break on specific exception type by using conditional breakpoints. However ... of bad_function_call works. 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++ - Differences of using "const cv::Mat &", "cv::Mat &", "cv::Mat" or "const cv::Mat" as function parameters?

I've searched thoroughly and have not found a straightforward answer to this. Passing opencv matrices (cv:: ... difference. Thanks guys! 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++ - Detailed guide on using gcov with CMake/CDash?

I'm using CMake with my project and set up a cdash server for continuous/nightly building. Everything works ... and uploaded to cdash server. 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's the differences between .dll , .lib, .h files?

Why in a project should I include some *.lib, .h or some other files? And what are these things used 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++ - Does 'auto' type assignments of a pointer in c++11 require '*'?

Given my variable being a pointer, if I assign it to a variable of "auto" type, do I specify the "*" ... to a variable. Sorry for the confusion 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 is the std::tr1::shared_ptr implemented?

I've been thinking about using shared pointers, and I know how to implement one myself--Don't want to do it ... using the std::tr1::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++ - Efficiently getting all divisors of a given number

According to this post, we can get all divisors of a number through the following codes. for (int i = 1; i <= ... 't seem to be a good one. 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 to use recursive mutex?

I understand recursive mutex allows mutex to be locked more than once without getting to a deadlock and should ... design/code-level situations. 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 must const members be initialized in the constructor initializer rather than in its body?

Why must class members declared as const be initialized in the constructor initializer list rather than in the ... difference between the two? 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++ - General rules of passing/returning reference of array (not pointer) to/from a function?

We can pass reference of an array to a function like: void f(int (&a)[5]); int x[5]; f(x); //okay ... is known at compile time, to a 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++ - What is the most efficient way to display decoded video frames in Qt?

What is the fastest way to display images to a Qt widget? I have decoded the video using libavformat and ... has been performed. 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++ - Derived class with non-virtual destructor

Are there any circumstances in which it is legitimate for a derived class to have a non-virtual destructor? ... class has a virtual 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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315 views

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c++ - Acquire/Release versus Sequentially Consistent memory order

For any std::atomic<T> where T is a primitive type: If I use std::memory_order_acq_rel for fetch_xxx ... in terms of efficiency? 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++ - constant variables not working in header

if I define my constant varibles in my header like this... extern const double PI = 3.1415926535; extern const ... be doing wrong ?? 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++ - Difference between C++11 std::bind and boost::bind

Is there any difference between the two? Or am I safe to replace every occurrence of boost::bind by std:: ... remove the dependence on Boost? 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 std::reference_wrapper and simple pointer?

Why is there a need to have std::reference_wrapper? Where should it be used? How is it different from a ... compares to a simple pointer? 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 const. pointer and reference?

What is the difference between a constant pointer and a reference? Constant pointer as the name implies ... and their implementations? cheers See Question&Answers more detail:os...

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

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363 views

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c++ - SSE intrinsic functions reference

Does anyone know of a reference listing the operation of the SSE intrinsic functions for gcc, i.e. the functions ... .h> header files? 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 estimate the thread context switching overhead?

I am trying to improve the performance of the threaded application with real-time deadlines. It is running on Windows ... ) for a given thread? 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 call on a function found on another file?

I'm recently starting to pick up C++ and the SFML library, and I was wondering if I defined a Sprite on a ... again, every pro was once a newb. See Question&Answers more detail:os...

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

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