Recent questions tagged C++

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c++ - Building a 32-bit float out of its 4 composite bytes

I'm trying to build a 32-bit float out of its 4 composite bytes. Is there a better (or more portable) way ... (max single precision) 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++ - "inline" keyword vs "inlining" concept

I am asking this basic question to make the records straight. Have referred this question and its currently accepted ... is true or false. 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++0x thread interruption

According to the C++0x final draft, there's no way to request a thread to terminate. That said, if ... 'interruption mechanism' or going native? 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++ - Visual Studio 2017 errors on standard headers

I just upgraded to Visual Studio 2017 Community Edition and I have trouble loading standard header files. I get 507 ... .h 10 I never had this issue with Visual St...

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

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c++ - I want to convert std::string into a const wchar_t *

Is there any method? My computer is AMD64. ::std::string str; BOOL loadU(const wchar_t* lpszPathName, int flag = 0); ... *' How can I do 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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291 views

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c++ - How to iterate over a priority_queue?

Can I traverse a standard priority_queue or standard queue in c++ with an iterator (like a vector)? I don't ... be dequeued. Thanks for any help 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++ - The tilde operator in C

I've seen the tilde operator used in the ELF hashing algorithm, and I'm curious what it does. (The code is from ... &= ~g; } return h; } 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 a use case for overloading member functions on reference qualifiers?

C++11 makes it possible to overload member functions based on reference qualifiers: class Foo { public: void f() ... is a reasonable use case? 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 return numpy.array from boost::python?

I would like to return some data from c++ code as a numpy.array object. I had a look at boost::python:: ... don't mind doing copies of data. 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 move constructors produced automatically?

I have a big class holding a lot of STL containers. Will the compiler automatically make a move constructor that will ... have to make my own? 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++ - static constexpr member of same type as class being defined

I would like a class C to have a static constexpr member of type C. Is this possible in C++11? Attempt 1: ... of Foo::f differing in constexpr. 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++ - QT : Templated Q_OBJECT class

Is it possible to have a template class, which inherit from QObject (and has Q_OBJECT macro in it's ... by explicitly instantiating templates? 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 I return in void function?

I have to return to the previous level of the recursion. is the syntax like below right? void f() { // some code here // return; } See Question&Answers more detail:os...

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

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255 views

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c++ - Can sizeof return 0 (zero)

Is it possible for the sizeof operator to ever return 0 (zero) in C or C++? If it is possible, is it correct from a standards point of view? 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++ - With explicitly deleted member functions in C++11, is it still worthwhile to inherit from a noncopyable base class?

With explicitly deleted member functions in C++11, is it still worthwhile to inherit from a noncopyable base class? I ... know better know. :-) 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 moving a vector invalidate iterators?

If I have an iterator into vector a, then I move-construct or move-assign vector b from a, does that ... ::swap does not invalidate iterators. 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 does the most negative int value cause an error about ambiguous function overloads?

I'm learning about function overloading in C++ and came across this: void display(int a) { cout << "int" << endl; } ... used: g++ (GCC) 4.8.5 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 imread(filename) fails in debug mode when using release libraries

I have some C++ code and everything was working fine with OpenCV except the function imread(file). It was finding ... ? Is it an OpenCV bug? See Question&Answers more detail:os...

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

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336 views

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c++ - Why do I need double layer of indirection for macros?

At: C++ FAQ - Miscellaneous technical issues - [39.6] What should be done with macros that need to paste two ... Is it some sort of trick here? 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 avoid memory leak with shared_ptr?

Consider the following code. using boost::shared_ptr; struct B; struct A{ ~A() { std::cout << "~A" < ... I need cross-references in the classes? See Question&Answers more detail:os...

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

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265 views

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c++ - Why don't STL containers have virtual destructors?

Does anyone know why the STL containers don't have virtual destructors? As far as I can tell, the only ... the cost of composition somewhat. See Question&Answers more detail:os...

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

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165 views

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c++ - Why is "!=" used with iterators instead of "<"?

I'm used to writing loops like this: for (std::size_t index = 0; index < foo.size(); index++) { // Do ... never see that in real code. Why not? 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 legitimate reasons exist to overload the unary operator&?

Okay, I've been inspired to do some head punching. Seems like overloading operator& leads to not a small amount of ... ve ever done 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 can I completely disable calls to assert()?

My code is full of calls to assert(condition). In the debug version I use g++ -g which triggers my ... are debug, release or anything else? 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++ - all combinations of k elements out of n

Can somebody provide me a link or pseudocode of a function for finding all combinations of k elements out of n? ... numbers of size k. 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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165 views

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c++ - Changing Function Access Mode in Derived Class

Consider the following snippet: struct Base { virtual ~Base() {} virtual void Foo() const = 0; // Public ... access mode in the derived class. See Question&Answers more detail:os...

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

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542 views

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c++ - What is the easiest way to print a variadic parameter pack using std::ostream?

What is the easiest way to print a parameter pack, separated by commas, using std::ostream? Example: template< ... types of the parameter pack. See Question&Answers more detail:os...

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

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314 views

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c++ - Why don't the std::fstream classes take a std::string?

This isn't a design question, really, though it may seem like it. (Well, okay, it's kind of a ... would use std::string wherever possible? See Question&Answers more detail:os...

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

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