Recent questions tagged C++

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c++ - Why was pair range access removed from C++11?

I just discovered that at one point, the C++11 draft had std::begin/std::end overloads for std::pair that ... some other way that I am missing? 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++ - unique_ptr boost equivalent?

Is there some equivalent class for C++1x's std::unique_ptr in the boost libraries? The behavior I'm looking ... b is deleted automagically. } 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 there const in C?

This question may be naive, but: is there const keyword in C? since which version? are there any semantic and/or ... const in C and C++? 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 write a std::string to a UTF-8 text file

I just want to write some few simple lines to a text file in C++, but I want them to be encoded in UTF- ... the easiest and simple way to do so? 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 the != operator not allowed with OpenMP?

I was trying to compile the following code: #pragma omp parallel shared (j) { #pragma omp for schedule(dynamic) for(i = 0 ... put "<" or "<=" . 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++ - "Field has incomplete type" error

There is an error in my header file: field "ui" has incomplete type. I have tried making ui a pointer, ... error line }; #endif // MAINWINDOW_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++ - When virtual inheritance IS a good design?

EDIT3: Please be sure to clearly understand what I am asking before answering (there are EDIT2 and lots of ... inheritance) is a good 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++ - How to prevent an object being created on the heap?

Does anyone know how I can, in platform-independent C++ code prevent an object from being created on the heap ... anyone have any ideas? Cheers, 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++ - using declaration in variadic template

This question is inspired in the following solution to multiple inheritance overloading pseudo-ambiguity, which is ... all different signatures. 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++ - Determining exception type after the exception is caught?

Is there a way to determine the exception type even know you caught the exception with a catch all? Example ... /Determine exception type 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++ - Is there an equivalent to WinAPI's MAX_PATH under linux/unix?

If I want to allocate a char array (in C) that is guaranteed to be large enough to hold any valid absolute ... is the equivalent for Unix/linux? 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++ - error::make_unique is not a member of ‘std’

I am trying to compile the following thread pool program posted on code review to test it. https://codereview. ... std::make_unique<unsigned>(); 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 1.0 a valid output from std::generate_canonical?

I always thought random numbers would lie between zero and one, without 1, i.e. they are numbers from the ... .org/bugs/show_bug.cgi?id=18767 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++ - Image edge smoothing with opencv

I am trying to smooth output image edges using opencv framework, I am trying following steps. Steps took from here ... the image is not smooth. 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 build boost Version 1.58.0 using Visual Studio 2015 (Enterprise)

I like to build boost 1.58.0 using the (new) Visual Studio 2015 (Enterprise). In the past I proceeded in ... source code of boost using VS2015? 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++ - Changing DPI scaling size of display make Qt application's font size get rendered bigger

I have created some GUI application using Qt. My GUI application contains controls like push button and radio button. ... to get rid of 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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c++ - std::vector reserve() and push_back() is faster than resize() and array index, why?

I was doing a quick performance test on a block of code void ConvertToFloat( const std::vector< short >& audioBlock ... AMD Turion 64 ML-37. 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 make the map::find operation case insensitive?

Does the map::find method support case insensitive search? I have a map as follows: map<string, vector< ... case: directory.find(search_string); 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 create an array of pointers?

I am trying to create an array of pointers. These pointers will point to a Student object that I created. How ... to the student object. 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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c++ - Default template parameter partial specialization

Please explain to me why the following piece of code complies and works perfectly. I am very confused. #include< ... of the template class Base? 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 2010 & 2008 can't handle source files with identical names in different folders?

Direct Question: If I have two files with the same name (but in different directories), it appears that only Visual ... bug in VS 2008 / 2010? 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 happens when an exception goes unhandled in a multithreaded C++11 program?

If I have a C++11 program running two threads, and one of them throws an unhandled exception, what happens? ... case)? Something else entirely? 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++ - malloc() vs. HeapAlloc()

What is the difference between malloc() and HeapAlloc()? As far as I understand malloc allocates memory from the ... is the difference? 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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c++ - Portable way of setting std::thread priority in C++11

What is the correct way in the post C++11 world for setting the priority of an instance of std::thread ... are available for the particular OS? 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 doesn't this reinterpret_cast compile?

I understand that reinterpret_cast is dangerous, I'm just doing this to test it. I have the following code: int ... 't this simple cast compile? 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 auto_ptr deprecated?

Will auto_ptr be deprecated in incoming C++ standard? Should unique_ptr be used for ownership transfer instead of ... to use shared_ptr instead? 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++ - Creating Library with backward compatible ABI that uses Boost

I'm working on a certain C++ library (or more framework). I want to make it backward compatible with ... Boost BCP supports namespace renaming. 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++ - difference between logical and physical const-ness

What is the difference between these two terms, and why do I need mutable? See Question&Answers more detail:os...

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

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