Recent questions tagged C++

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c++ - Linker error LNK2001

When I try to create an object I get a LNK2001 error in Visual Studio, it's a problem with the constructor I think ... type of account?"; } }; 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 ofstream insert a 0x0D byte before 0x0A?

I'm outputing an array of unsigned characters in C++ using ofstream fout("filename"); but it produces a spurious ... you think of this problem. 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++ - trait to drop const from a member function type?

When T is double(float)const I get this error when I try to use function<T>. implicit instantiation of ... cryptic, but basically the same) 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 randomly select a class to instantiate without using switch?

I'm refactoring a single 3000+-line class with a tangled web of conditionals and switches into a set of ... clarity of the original code? 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++ - Single-Element-Vector Initialization in a Function Call

Consider the following example code: Example: void print(int n) { cout << "element print "; } void print( ... vectors with more than 1 elements. 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 add a manifest file to a project in visual studio 2010?

I am trying to add a manifest file to a project with Visual Studio 2010, so as to set the project ... Properties dialog (manifest tool) itself? 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++ - Inserters for STL stack and priority_queue

std::vector, std::list and std::deque have std::back_inserter, and std::set has std::inserter. For std::stack ... :inserter(stk)); return 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++ - Is rand() really that bad?

Inspired by General purpose random number generation I decided to perform my own tests to see what was wrong with ... I conduct my test wrong? 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 prepend namespace with ::, for example ::std::vector

I have seen production code such as ::std::vector<myclass> myvec; I have no idea what the prepending :: ... way to iterate over STL containers 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++ - assignment of class with const member

Consider the following code: struct s { const int id; s(int _id): id(_id) {} }; // ... vector<s> v; ... new if the object is on the stack? 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++ - Override Ctrl-C

I am supposed override the CtrlC signal and use it to print a message. It is not supposed to end the program. What ... } while(report != 1) } 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++ - Is it possible to have a pointer literal?

In C one can have string literals in the form of char *string = "string here"; integer literals: uint8_t num = ... this feature exists in C++. 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 create an array of templated class objects?

I haven't done any C++ programming for quite some time and I decided that I would mess around with it ... Any help would be greatly appreciated. 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++ - Trait to check if some specialization of template class is base class of specific class

There is std::is_base_of in modern STL. It allow us to determine whether the second parameter is derived from ... from any specialization of B? 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++ - Error handling in std::ofstream while writing data

I have a small program where i initialize a string and write to a file stream: #include<iostream> #include< ... failed. Thanks in advance. See Question&Answers more detail:os...

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

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423 views

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c++ - Why copy constructor is called in std::vector's initializer list?

I have the following very simple class: class Foo { public: Foo() {} Foo(const Foo&) = delete; Foo(Foo&&) {} ... might be not true from C++14. 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 allow template function to have friend(-like) access?

How does one modify the following code to allow template function ask_runUI() to use s_EOF without making s_EOF public? ... << " EOF "; } See Question&Answers more detail:os...

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

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234 views

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c++ - How to make the lambda a friend of a class?

Let's say, I have a class: class A { int a; }; And I have a lambda: auto function = [](A ... something else. All reasonable schemes are welcome. 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++ - Is a header necessarily a file?

T.C. left an interesting comment to my answer on this question: Why aren't include guards in c++ the default? ... source file names (16.2). 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 did C++03 require template parameters to have external linkage?

Background In C++03, symbols used as template arguments must have external linkage; this restriction was removed in ... different C++11 feature? See Question&Answers more detail:os...

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

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330 views

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c++ - how to set an icon on a Main window and action with QT

Honestly I do not understand resource files and how to get so that my things can get done, because it was partially ... up or even show a error. 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 restrictions does ISO C++03 place on structs defined at function scope?

We're not allowed to define a functor struct inside a function because one is not allowed to use function ... workingBuffer; //Blah Blah } See Question&Answers more detail:os...

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

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301 views

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c++ - Creating image with Boost.GIL

I've been trying to read the boost::gil documentation, but it's somewhere between lacking, and convoluted. Ranting ... anyone can help, 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++ - CString to char*

We are using the CString class throughout most of our code. However sometimes we need to convert to a char *. at ... might not be a good idea. 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++ - Where ampersand "&" can be put when passing argument by reference?

In the examples that I saw the arguments were passed by reference in the following way: void AddOne(int &y) ... different from the first one. 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 input int64_t / uint64_t constants?

What I'm trying to do is to define a constant equal to 2^30 (I may change it to something like 2^34, so I ... why? int main() { return 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++ - delete modifier vs declaring function as private

I read this question, but it still doesn't make a lot of sense to me. It still sounds more like a ... Same for operator= or other functions. See Question&Answers more detail:os...

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

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262 views

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c++ - Are inline variables unique across boundaries?

This is a follow up of this question. As mentioned in the comments to the answer: An inline variable has the ... that I should not rely on? See Question&Answers more detail:os...

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

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