Recent questions tagged C++

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c++ - What do __STDC_LIMIT_MACROS and __STDC_CONSTANT_MACROS mean?

I see this in the standard C++ libraries for my system, as well as some of the headers in a library I' ... this other than the source 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++ - declaring a const instance of a class

Let's say I have a class defined as follows: class foo{}; now, this is perfectly acceptable; foo f; how come ... close it if it's stupid... 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 put void in params?

What's the reason for putting void inside of the params? Why not just leave it blank? void createLevel(void); void createLevel(); 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's the result of a & b?

This is awkward, but the bitwise AND operator is defined in the C++ standard as follows (emphasis mine). The ... is not clear. What gives? 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++ - "multiset" & "multimap" - What's the point?

As the question states ... I don't get the point about multisets / multimaps. So, what's the purpose? 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++ - int_least64_t vs int_fast64_t vs int64_t

I'm trying to port my code to 64bit. I found that C++ provides 64bit integer types, but I'm still ... and fast types? What about intmax_t? 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++ - Add leading zero's to string, without (s)printf

I want to add a variable of leading zero's to a string. I couldn't find anything on Google, without someone ... of the readers know a way? 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 is the fully qualified name of a friend function defined inside of a class?

What is the fully qualified name of a friend function defined inside of a class? I recently saw an example ... to gain a better understanding. 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 aren't there compiler-generated swap() methods in C++0x?

C++ compilers automatically generate copy constructors and copy-assignment operators. Why not swap too? These days ... committee members had? 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 save settings in gdb?

Does anyone know how to save gdb settings (like "set print pretty on" or "set print elements 0", both from here ... and SO, but I found nothing. 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++ - std::stringstream vs std::string for concatenating many strings

I know one of the advantages of std::stringstream is that it is a std::istream so it may accept ... :string for concatenating many strings? 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 this function have explicit return values on all control paths?

I have a Heaviside step function centered on unity for any data type, which I've encoded using: template <typename ... How do I deal with 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++ - OpenCV Bounding Box

I am working on software using OpenCV in C++ environment. The objective is to detect a boxing glove and draw a ... center points and area. :) 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++ - FFmpeg decode raw buffer with avcodec_decode_video2

I am receiving a h264 stream where I at least know the size of one frame. The stream is coming in right as ... does not need to guess any data. 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++ - redirect std::cout to a custom writer

I want to use this snippet from Mr-Edd's iostreams article to print std::clog somewhere. #include <iostream> #include ... is way over my head. 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++ - Aruco markers with openCv, get the 3d corner coordinates?

I am detecting a printed Aruco marker using opencv 3.2: aruco::estimatePoseSingleMarkers(corners, markerLength, camMatrix ... of the corners? 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++ - Call function with parameters extracted from string

I'm looking at the following problem: I get strings that are formatted like this: functionname_parameter1_parameter2_parameter3 ... 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 do I compile for 64bit using G++ w/ CodeBlocks?

I'm currently working on creating a shared lib DLL but I need to load it at runtime in a 64 bit environment so ... -m64 but none seem to work. 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++ variadic template constructor and common constructors

Code like (c++14): struct S { int a; int b; }; class C { public: C(char const*, size_t) {} ... *) {} And without additional tags in constructors 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++ - Building boost::options from a string/boost::any map

I have a map which represents a configuration. It's a map of std::string and boost::any. This map is ... doing it myself? 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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c++ - Release/Acquire semantics wrt std::mutex

I am reading the C++ memory model defined in n3485 and it talks about release/acquire semantics, which from ... ordering. Can anybody clarify? See Question&Answers more detail:os...

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

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213 views

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c++ - const reference can be assigned an int?

I came across a code snippet const int& reference_to_const_int = 20; cout<<" reference_to_const_int = "<< ... . Kindly 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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104 views

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c++ - why does deleting move constructor cause vector to stop working

If I inhibit the move constructor in a class, I can no longer use it in a vector: class Foo { public: Foo(int i) ... Foo(1)); } Why is this 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++ - CUDA external class linkage and unresolved extern function in ptxas file

I'm working with CUDA and I have created an int2_ class to deal with complex integer numbers. Class declarations in ... of what is going 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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c++ - Why don't memory allocators actively return freed memory to the OS?

Yes, this might be the third time you see this code, because I asked two other questions about it (this and this) ... ) in the process of a.out. See Question&Answers more detail:os...

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

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752 views

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c++ - OpenCV: Calculate angle between camera and pixel

I'd like to know how I can go about calculating the angle of some pixel in a photo relative to the webcam ... about it but am unsure. 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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186 views

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c++ - Do i have static or dynamic boost libraries?

I have ran bjam.exe --build-dir="C:uild-boost" --build-type=minimal msvc stage and now I have libraries .lib ... -sgd where am i going 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++ - Cygwin in Visual Studio

I'm trying to port an old program I wrote for class from KDev in Ubuntu to Windows Visual Studio 2008 using ... way to go about doing 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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