Recent questions tagged C++

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c++ - How does an exception specification affect virtual destructor overriding?

The C++ Standard states the following about virtual functions that have exception specifications: If a ... empty exception specification). 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++ - valgrind and openmp, still reachable and possibly lost, is that bad?

c++ newbie here. I've been improving my memory management skills over the last few days, and my program no ... (sBladeSymmetry) { break; } } 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 unions have a deleted default constructor if just one of its members doesn't have one?

N3797::9.5/2 [class.union] says: If any non-static data member of a union has a non-trivial default ... default constructor. What's wrong? 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++ cli - C++/CLI-Question: Is there an equivalent to the C# "is" keyword or do I have to use reflection?

I've read somewhere on MSDN that the equivalent to C#'s "is" keyword would be dynamic_cast, but that's not really ... a simpler way to do this? 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++ - Merging cv::Mat horizontally

I want to merge a few cv::Mat, when I use mat1.push_back(mat2) it add mat2 to the end of mat1 ... pointlessly long if there is another 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++ - Given a start and end point, and a distance, calculate a point along a line

Looking for the quickest way to calculate a point that lies on a line a given distance away from the end ... it completely, can anyone clarify? 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 C compiler rearrange stack variables?

I have worked on projects for embedded systems in the past where we have rearranged the order of declaration of ... all correct. Thanks again. 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 there no multiple definition error when you define a class in a header file?

I'm not sure if I asked the question correctly, but let me explain. First, I read this article that ... s so special about class 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++ - checking if pointer points within an array

Can I check whether or not a given pointer points to an object within an array, specified by its bounds? ... is it impossible to solve? 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++ - Correct implementation of min

At time 0:43:15 in this Tech-Talk about D, The implementation of the min function is discussed. Concerns about ... are N1840, N2485 and N2551 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++ - getopt fails to detect missing argument for option

I have a program which takes various command line arguments. For the sake of simplification, we will say it takes ... options will begin with -? 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 load a bmp on GLUT to use it as a texture?

I've been searching all around for a simple solution to add sprites to my OpenGl GLUT simple moon lander game in ... bmp's as textures though? 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 QFileSystemWatcher to monitor a folder for change

I'm new with QT and I want to use the QFileSystemWatcher to monitor a folder. I just can't figure how to ... Thx for your answers and regards. 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 decide if a template specialization exist

I would like to check if a certain template specialization exist or not, where the general case is not defined. ... without C++11)? 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 find substring from string?

How do I find a substring from the string path "/user/desktop/abc/post/" using C/C++? I want to check if ... ptr = "/user/desktop/abc/post/"; 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 the compiler optimize the function parameters passed by value?

Lets say I have a function where the parameter is passed by value instead of const-reference. Further, lets ... any compiler which does 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 statically link to TBB?

How can I statically link the intel's TBB libraries to my application? I know all the caveats such as unfair ... know or have any clues? 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 use external DLLs in CMake project

I've been searching over the internet but I couldn't find anything that would answer my question (or I don't ... I hope I was clear enough. 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++ - warning: narrowing conversion C++11

g++ 4.9.0 -O2 -std=c++11 template<class T> struct vec3 { T x, y, z; vec3() = default; ... the operator- function the warning disappears. Why? 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 in x86 any instructions to accelerate SHA (SHA1/2/256/512) encoding?

An example, in x86 are Instruction Set to hardware acceleration AES. But are there in x86 any instructions to ... to encoding SHA on x86? 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 to tie std::cin and std::cout?

By default, the standard input device is tied together with the standard output device in the form: std::cin. ... they share the same buffer? 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 could I sensibly overload placement operator new?

C++ allows overloading operator new - both global and per-class - usual operator new, operator new[] ... overload placement operator new? 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 address of this volatile variable always at 1?

I wanted to inspect the address of my variable volatile int clock; cout << &clock; But it always says that x ... . Am i doing something wrong?? 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 end+1 iterators for std::string allowed?

Is it valid to create an iterator to end(str)+1 for std::string? And if it isn't, why isn't it? ... to overwrite std::string's null terminator? 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++ - Specialization of member function template after instantiation error, and order of member functions

The following bit of code fails to compile on gcc 4.5.3 struct Frobnigator { template<typename T> void foo(); template< ... { } int main() { } 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++ - Random numbers for multiple threads

Problem I intend to write a C++11 application for Linux which does some numerical simulation (not cryptography) ... how things actually 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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c++ - std::shared_ptr and initializer lists

The std::shared_ptr constructor isn't behaving as I expected: #include <iostream> #include <vector> void func(std:: ... ) ^ 1 error generated. 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 operator""s hidden in a namespace?

In order to use operator""s for std::string you have to do using namespace std::string_literals. But user-defined ... 's the reason for this? See Question&Answers more detail:os...

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

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