Recent questions tagged C++

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I have some code on a Cortex-M4 microcontroller and'd like to communicate with a PC using a binary protocol. ... burned by floats before...) 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++ - Usefulness of signaling NaN?

I've recently read up quite a bit on IEEE 754 and the x87 architecture. I was thinking of using NaN as ... for NaN and returns NaN immediately. 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++ - Understanding boost::disjoint_sets

I need to use boost::disjoint_sets, but the documentation is unclear to me. Can someone please explain ... type should be vertex_descriptor. 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++ - Project ERROR: Unknown module(s) in QT: webkitwidgets

I am porting code from qt4 to qt5. I added the following line to my .pro file, as suggested: QT += ... 04 LTS and installed Qt as described. 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::back_inserter for a std::set?

I guess this is a simple question. I need to do something like this: std::set<int> s1, s2; s1 = ... it later. Maybe that's better? 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++ - Shell Icon Overlay (C#)

I need a method to create Icon Overlay's for Folders and Files in Windows XP/Vista, using C# or C++? Any examples? Thanks, -Sean! 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 create a thread-safe singleton pattern in Windows?

I've been reading about thread-safe singleton patterns here: http://en.wikipedia.org/wiki/Singleton_pattern#C.2B.2B_. ... Thanks again to Josh. 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++ - Should I return an rvalue reference (by std::move'ing)?

A C++Next blog post said that A compute( ) { A v; return v; } If A has an accessible copy or move ... the value with the help of std::move? 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++ - Programmatically selecting file in explorer

In my application I can programmatically open explorer and select a file using the following code: void BrowseToFile( ... to know about 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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c++ - How to Build libcxx and libcxxabi by clang on CentOS 7

I want to use C++11 or C++14 with clang/clang++ on CentOS 7. How do I build this building environment? 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++11 constexpr flatten list of std::array into array

I am beginning with c++11, constexpr and template metaprogramming seems a nice way to save scarce ram on tiny ... option if it is needed. 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 declare array with auto

I have been playing with auto and I noticed that for most cases you can replace a variable definition with auto and then ... ; auto z = int[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++ - STD linker error with Apple LLVM 4.1

I've got a large static library in C++ with bits of Objective-C originally built for iOS (armv7). I built a OS ... . How can I fix that? 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++ - Cross-Platform equivalent to windows events

I'm trying to port some Windows code to Linux, ideally through platform-independent libraries (eg boost), however I'm ... is not the case 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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292 views

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c++ - Conversion from IplImage* to cv::MAT

I searched to convert an IplImage* to Mat, but all answers were about the conversion to cvMat. How, can I ... Mat and cvMat? Thanks in advance See Question&Answers more detail:os...

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

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237 views

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c++ - Using ZeroMQ together with Boost::ASIO

I've got a C++ application that is using ZeroMQ for some messaging. But it also has to provide a SGCI connection ... be a waste of resources... See Question&Answers more detail:os...

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

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318 views

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c++ - code browsing, refactoring, auto completion in Emacs

I recently switched to Emacs and still finding my way through it. I code in C++ and was wondering what tools out ... I need all of these tools? See Question&Answers more detail:os...

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

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487 views

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c++ - Default move constructor/assignment and deleted copy constructor/assignment

According to the standard, If the definition of a class X does not explicitly declare a move constructor, one will be ... than they used to be. See Question&Answers more detail:os...

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

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154 views

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c++ - Quick sort at compilation time using C++11 variadic templates

I just implemented the quick sort algorithm by using C++11 variadic templates to evaluate it at compilation time. However, ... using gcc 4.6.0. 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++ - When is it safe to call this-> in constructor and destructor

I've not been able to find a conclusive answer to this so far. When is it safe to call this-> from ... of the practices above are inadvisable. 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++11: Template Function Specialization for Integer Types

Suppose I have a template function: template<typename T> void f(T t) { ... } and I want to write ... and the first version for everything 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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354 views

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c++ - const unsigned char * to std::string

sqlite3_column_text returns a const unsigned char*, how do I convert this to a std::string? I've ... overload resolution was ambiguous See Question&Answers more detail:os...

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

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120 views

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c++ - C++11 Compiler: Closest to the standard and how close?

I'm interested in learning C++ more thoroughly now that C++11 is apparently ratified. What compiler ... just language lawyer minutiae? See Question&Answers more detail:os...

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

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529 views

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c++ - VS 2012 - Project failed to build because of missing Toolset

I am unable to compile/build anything within Visual Studio C++ 2012 because I am getting an error that states ... I made a clean uninstallation. 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 get Python exception text

I want to embed python in my C++ application. I'm using Boost library - great tool. But i have one problem. ... error so it can't be solution See Question&Answers more detail:os...

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

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875 views

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c++ - Node packages not building on Windows 8.1 - Missing Microsoft.Cpp.Default.props

NPM packages are not building on Windows 8.1 - failing with following error, error MSB4019: The imported ... definite answer that 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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340 views

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c++ - warning C4003 and errors C2589 and C2059 on: x = std::numeric_limits<int>::max();

This line works correctly in a small test program, but in the program for which I want it, I get the following ... the macro max(a,b); ? See Question&Answers more detail:os...

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

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201 views

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c++ - Integrate type name in static_assert output?

I like to give helpful errors / messages, and I also want to do so for my static_asserts. The problem is, ... , as to make it passable? See Question&Answers more detail:os...

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

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