Recent questions tagged c++

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c++ - Why does a move constructor require a default constructor for its members?

I was trying to implement a move constructor for a class without a copy constructor. I got an error that the ... error? Any way around it? 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++ - unique_ptr<int[]> or vector<int>?

If you don't need dynamic growth and don't know the size of the buffer at compile time, when should ... in using vector instead of unique_ptr? 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++ - The program file specified in the launch configuration does not exist

I am facing some problems regarding eclipse for c/c++. I am trying to create a new project, I provide the code ... and how can I resolve it? 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++ - invalid operator < while sorting std::list

I have a std::list graph edges and i want to sort the edges based on their destination outdegree and ... in removing this exception. 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++ - 'sqrt' is not a member of 'std'

I compile my program in linux - it has the following line : std::sqrt((double)num); On windows it is ok,but on ... .h what is a problem with it? 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 append to a file with fstream fstream::app flag seems not to work

i simply want to write (append) to a logfile. I looked it up here: http://www.cplusplus.com/reference/iostream/ ... << endl; outfile.close(); 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++ - Release mode static library much larger than debug mode version

today i found out that the compiled static library i'm working on is much larger in Release mode than in ... enable function level linking: Yes 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++ - Peeking the next element in STL container

Is it possible to peek next element in a container which the iterator currently points to without changing the iterator ... next element is n+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 safe to use emplace_back with a container of unique_ptrs?

Consider the following: std::vector<std::unique_ptr<int>> ptrsToInts; ptrsToInts.emplace_back(new int); If ... for containers of unique_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++ - Memory / heap management across DLLs

Although it seems to be a very common issue, I did not harvest much information: How can I create a safe ... shared objects "inflicted" too? 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++ - Are value parameters implicitly moved when returned by value?

Consider the following function: Foo foo(Foo x) { return x; } Will return x invoke the copy constructor or ... +'s behavior conforming or not? 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++ - stl map performance?

I am using map<MyStruct, I*> map1;. Apparently 9% of my total app time is spent in there. Specifically on ... will not add any more 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++ - Copy elision for pass-by-value arguments

Given struct Range{ Range(double from, double to) : from(from), to(to) {} double from; double to; }; ... objects inside box to begin with?) 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++ - Writing an iterator that makes several containers look as one

Consider the following simplified example and desired output: class A { class combined_iterator { ???? } typedef ? ... required in that sense. 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 can I change color of part of the text in QLineEdit?

I want to add some syntax highlighting to text being written in QLineEdit, but it does not support rich text formatting, ... a way to do this? 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++ - Counter exit code 139 when running, but gdb make it through

My question sounds specific, but I doubt it still can be of a C++ debug issue. I am using omnet++ which is ... but debug doesn't? Many 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++ - Setting GDB hardware watchpoint/how to set software watchpoint

An earlier question explained that on x86 the size of objects being watched is limited by debug registers. As expected, ... force it to do so? 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++ - Using Cmake with Qt Creator

I would like to use Qt creator and Cmake together (please, don't ask me about my motivation, accept this as a ... m using Qt creator v2.4.1. 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++ - How does "using std::swap" enable ADL?

In What is the copy-and-swap idiom this example is shown: friend void swap(dumb_array& first, dumb_array& second) // ... is using std::swap for? 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++ - Are 'addition' and 'bitwise or' the same in this case?

Say I have four 32-bit numbers, defined so that their bits don't overlap, i.e. unsigned long int num0 = ... for such sort of numbers? 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++ - 'QObject::QObject' cannot access private member declared in class 'QObject'

class CHIProjectData : public QObject { public: CHIProjectData(); CHIProjectData(QMap<QString,QString> aProjectData, ... QObject'" 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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268 views

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c++ - Is it safe for multiple threads to call the same function?

Is it safe to for example do: void AddTwo(int &num) { num +=2; } void ThreadProc(lpvoid arg) { AddTwo(( ... doing this at the same time? 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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243 views

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c++ - force visual studio to link all symbols in a lib file

Is there any way to force visual studio to link all symbols from a lib file into the dll as atm it is ... not being linked in the dll. 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 find the calling convention of a third party dll?

Could any one explain me how to get to know the calling convention of a dll without getting and processing ... (__stdcall, __cdecl, __fastcall) 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++ - Does restrict help in C if a pointer is already marked const?

Just wondering: When I add restrict to a pointer, I tell the compiler that the pointer is not an alias for ... is supposed to work here. See Question&Answers more detail:os...

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

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390 views

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c++ - Can I read files from the disk by using Webassembly?

I followed the Webassembly getting started tutorial http://webassembly.org/getting-started/developers-guide/ It worked fine ... --port 8080 . See Question&Answers more detail:os...

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

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340 views

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c++ - PDB 'vc100.pdb' was not found with

I have downloaded the FreeImage source code and done a static build myself for X64 MT DLL. Everything works fine, except ... I had hoped for... See Question&Answers more detail:os...

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

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286 views

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c++ - What's the right way to specialize a template when using "extern template"?

I am hoping someone can point out the correct way to specialize a method in a template class while using "extern ... way to do this? 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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