Recent questions tagged C++

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I understand the use of void pointer for malloc implementation. void* malloc ( size_t size ); Can anyone ... is useful in practice. 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++ - Make custom type "tie-able" (compatible with std::tie)

Consider I have a custom type (which I can extend): struct Foo { int a; string b; }; How can I make an ... hack as in (1) can be applied. 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++ - Culling techniques for rendering lots of cubes

I am working on a personal learning project to make a Minecraft clone. It is working very well aside from one thing. Similar ... tmp); } } } } } 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++ - Qt Slots and C++11 lambda

I have a QAction item that I initialize like follows: QAction* action = foo->addAction(tr("Some Action")); ... use lambdas to get the sender? 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 if I write return statement in constructor?

What if I write return statement in constructor? Is it standard conformant? struct A { A() { return; } }; ... any implicit return type at 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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c++ - Understanding glm::lookAt()

I am following a tutorial to learn OpenGL in which they used glm::lookAt() function to build a view but I cannot ... don't know what the up is) 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 print a C++11 time_point?

I've created a time point, but I have been struggling to print it to the terminal. #include <iostream> ... expects 0 arguments, 1 provided 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++ - Strange code that compiles with g++

The following code compiles successfully with g++ 4.8.1: int main() { int(*)(); } It looks like a ... are being tracked as gcc bug 68265. 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 does one downcast a std::shared_ptr?

Consider: struct SomethingThatsABase { virtual bool IsChildOne() const { return false; } virtual bool IsChildTwo() ... the two shared_ptrs) 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 is shared_ptr<void> legal, while unique_ptr<void> is ill-formed?

The question really fits in the title: I am curious to know what is the technical reason for this difference, ... uniqueToVoid; // ill-formed; 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++ - read input files, fastest way possible?

I have numerous text files of data in the form of float numbers. I'm looking for the fastest way to read ... the work, that would be helpful. 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++ - OpenCV Undefined symbols for architecture x86_64: error

before this gets flagged as a repeat question please read the end. Thanks for looking. I set up openCV using ... usr/local/include/opencv/cv.h 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++ - OpenCV Edge/Border detection based on color

I'm fairly new to OpenCV, and very excited to learn more. I've been toying with the idea of outlining edges ... and outline it. Original Image: See Question&Answers more detail:os...

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

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315 views

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c++ - Delete virtual function from a derived class

I have a virtual base class function which should never be used in a particular derived class. Is there a ... to get the same functionality? See Question&Answers more detail:os...

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

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280 views

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c++ - Why are class member functions inlined?

I think my question has been asked here before, I did read them but still little confused and therefore ... answered by Emilio Garavaglia) See Question&Answers more detail:os...

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

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411 views

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c++ - Unsigned int reverse iteration with for loops

I want the iterator variable in a for loop to reverse iterate to 0 as an unsigned int, and I cannot think of ... and i must be an unsigned int. See Question&Answers more detail:os...

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

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500 views

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c++ - Variadic template templates and perfect forwarding

This question on the object generator pattern got me thinking about ways to automate it. Essentially, I want to ... implemented it in GCC4.4. 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++ - Converting ostream into standard string

I am very new to the C++ STL, so this may be trivial. I have a ostream variable with some text in it. ostream ... it in a string of type char*? 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++ - rand() between 0 and 1

So the following code makes 0 < r < 1 r = ((double) rand() / (RAND_MAX)) Why does having r = (( ... definitely gives me values between -1 and 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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c++ - Why does cout print "2 + 3 = 15" in this snippet of code?

Why is the output of the below program what it is? #include <iostream> using namespace std; int main(){ ... meta discussion about this issue. 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 the __attribute__((visibility("default")))?

Reading Visibility in the GNU wiki, it is clear. Taking this example from C++ Tutorials // classes example #include < ... 4.7.2 version of gcc See Question&Answers more detail:os...

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

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280 views

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c++ - Compile a Standalone Static Executable

I'm trying to compile an executable (ELF file) that does not use a dynamic loader. I built a cross ... need to rebuild my cross compiler? See Question&Answers more detail:os...

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

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373 views

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c++ - How to remove element not at top from priority_queue?

In my program I need to delete an element from a priority queue that is not at the top. Can that be done? ... so except creating your own heap. See Question&Answers more detail:os...

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

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632 views

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c++ - Which Cross Platform Preprocessor Defines? (__WIN32__ or __WIN32 or WIN32 )?

I often see __WIN32, WIN32 or __WIN32__. I assume that this depends on the used preprocessor (either one ... __WIN32__, __APPLE__ and __LINUX__. 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++ - Visual Studio 2013 fatal error C1041 /FS

I'm using Visual Studio 2013. Every so often by project refuses to compile. If I undo any changes, it ... encountered this and found a fix? See Question&Answers more detail:os...

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

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681 views

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c++ - Question about a function definition (three dots in parameters..)

I came across a function definition: char* abc(char *f, ...) { } What do the three dots mean? See Question&Answers more detail:os...

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

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285 views

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c++ - How to publicly inherit from a base class but make some of public methods from the base class private in the derived class?

For example, class Base has two public methods: foo() and bar(). Class Derived is inherited from class Base. In ... private: void bar(); }; 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 rationale for parenthesis in C++11's raw string literals R"(...)"?

There is a very convenient feature introduced in C++11 called raw string literals, which are strings with no ... problems with these proposals? See Question&Answers more detail:os...

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

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