Recent questions tagged C++

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c++ - When should functions be member functions?

I have a colleague in my company whose opinions I have a great deal of respect for, but I simply cannot ... to use object oriented design)? 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++ - Make a file pointer read/write to an in-memory location

I can make a file pointer write to a file with fopen(). But can I make a file pointer that will make ... these Java classes than fmemopen does. 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 entering library's source files while debugging in Qt Creator with gdb?

How can I configure Qt Creator and/or gdb so that while debugging my program using Qt libraries the debugger would ... into Qt's source files? 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 can't templates be declared in a function?

Reading C++ Templates: The Complete Guide and it says Note that templates cannot be declared in a ... primary-expression before "template" 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 valgrind say basic SDL program is leaking memory?

Here is the SDL program: #include <SDL/SDL.h> int main(int argc, char** argv){ SDL_Init(SDL_INIT_VIDEO); ... basic SDL program leaking memory? 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++ - Interesting behavior of compiler with namespaces

Assume the following code: #include <iostream> using namespace std; namespace X { class A{}; void f(A a) ... does compiler behave in such cases? 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 name mangling not standardized

I'm just wondering why name mangling was never standardized by the C++ standard. Clearly having different name ... extern "C" speak volumes. 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 increment an iterator by just adding a number?

Can I do normal computations with iterators, i.e. just increment it by adding a number? As an example, if I ... if it is guaranteed to 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++ - Why is operator!= removed in C++20 for many standard library types?

According to cppreference, std::type_info::operator!= gets removed with C++20, however, std::type_info::operator== ... , just the opposite... 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++ - Is it wise to ignore gcc/clang's "-Wmissing-braces" warning?

Consider the following program: #include <array> int main() { std::array<int, 1> x = { 0 }; // ... where the warning would have helped you? 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++ - Is the behavior of subtracting two NULL pointers defined?

Is the difference of two non-void pointer variables defined (per C99 and/or C++98) if they are both NULL valued? For ... b->pwrite - b->pread; } 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 sort a linked list using bubble-sort?

I am trying to use bubble-sort in order to sort a linked list. I use curr and trail in order to traverse thru ... } } What am I missing 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++ - OpenCV SURF function is not implemented

When I try to run the sample find_obj.cpp or any OpenCV SURF program I get the following error in command prompt ... , params); 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++ - Character sets - Not clear

The standard defines basic source character set basic execution character set and its wide char counterpart It ... execution character set'? 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++ - Starting QTimer In A QThread

I am trying to start a QTimer in a specific thread. However, the timer does not seem to execute and nothing is ... cout << "it works"; } See Question&Answers more detail:os...

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

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711 views

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c++ - Making a borderless window with for Qt

I'm new to Qt C++. I downloaded the latest windows version, did some tutorials and its great. I saw some styling ... How can I do it with Qt? 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 do I use google mock in C?

I'm maintaining a legacy project written in C and it's unfeasible to get it running with a C++ compiler ... has better flexibility than me. 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++ - Loading a file into a vector<char>

I would like to load the contents of a text file into a vector<char> (or into any char input iterator, if ... a more direct way of doing 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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388 views

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c++ - How do I build boost with new Visual Studio 2013 preview?

When trying to build Boost 1.54 for Visual Studio 2013 Preview (MSVC12) it warns: Unknown compiler version - ... new Visual Studio 2013 Preview? 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 make FILE* from HANDLE in WinApi?

Is there easy way to create FILE* from WinApi HANDLE which points to one end of pipe? Something like we do in unix: fdopen(fd,<mode>); 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 Compress Slot Calls When Using Queued Connection in Qt?

After reading some articles like this about Qt Signal-Slot communications I still have a question concerning the queued ... in my previous code) 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 RVO disallowed when returning a parameter?

It's stated in [C++11: 12.8/31] : This elision of copy/move operations, called copy elision, is permitted ... simply extend the lifetime of x? 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 std::protect?

Why is there no std::protect to use together with std::bind in C++11? Boost.Bind provides a boost::protect ... std::placeholders::_1))); } 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 do I find a particular value in an array and return its index?

Pseudo Code: int arr[ 5 ] = { 4, 1, 3, 2, 6 }, x; x = find(3).arr ; x would then return 2. 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 the difference between opening a file with ios::binary or ios::out or both?

I'm trying to figure out the difference between opening a file like: fstream *fileName*("FILE.dat",ios::binary); ... << or *fileName*.write(). See Question&Answers more detail:os...

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

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445 views

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c++ - int *array = new int[n]; what is this function actually doing?

I am confused about how to create a dynamic defined array: int *array = new int[n]; I have no idea what ... int? Would someone care to explain? 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: returning reference to temporary

I have a function like this const string &SomeClass::Foo(int Value) { if (Value < 0 or Value > 10) ... a static member) cannot be temporary. 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++ - Consistent pseudo-random numbers across platforms

I am looking for a way to generate pseudo random number sequences that will yield identical sequence results for ... about this assumption). See Question&Answers more detail:os...

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

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