Recent questions tagged C++

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c++ - kIOReturnNotPermitted from IOServiceOpen connecting to SystemExtension IOService

I am trying to create a client connection to a SystemExtension IOService. I can see that my IOUserClient subclass is ... > </dict> </plist> 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++ - Shared connection over multiply threads

Is it possible to create pointer of DBClientConnection and use it in multiply threads? connection = new ... to connection simultaneously? 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 extract area of an image from a vector of squares

I have an image that contains a square, and I need to extract the area contained in that square. After ... accept also non perfect squares? 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++ - g++ O1 is not equal to O0 with all related optimization flags

I know the title is a bit confusing. Let me clarify my problem with a little background: My program behaves strangely ... 27ubuntu1~18.04) 7.3.0 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 point of deleted destructor?

I come across the rule (section N3797::12.8/11 [class.copy]) An implicitly-declared copy/move constructor is ... 't you clarify that thing? 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++ - Python.h not found while building sample application with cmake and pybind11

I want to build simple app with pybind11, pybind is already installed in my Ubuntu system with cmake (and make ... , Python.h is available) 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++ - cv::remap (in opencv) and interp2 (matlab)

I am trying to look for an equivalent opencv function for interp2 and I understand that cv::remap is a good ... the matlab function does 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++ - incomplete type error

Im trying to make class A a friend of class B. class B; class A{ public: void show(const B&); // ##1## ... above at ##1## why this is possible ? 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++ - LINK : fatal error LNK1248: image size exceeds maximum allowable size (80000000)

I am doing some extremely large array processing. I do a global declaration of: `float array[200][1600][ ... be greatly appreciated. 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++ - Simple variadic template function can't instantinate

I'm aware that sizeof...(Args...) yields the number of types in a C++0x packed template argument list, but ... can I make this work? 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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457 views

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c++ - In which cases is alloca() useful?

Why would you ever want to use alloca() when you could always allocate a fixed size buffer on the stack large ... not a rhetorical question... 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 STL/Boost to initialize a hard-coded set<vector<int> >

Like this question already asked, I'd like to initialize a container using STL where the elements are hard-coded in ... an example 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++ - Crash : terminate called after throwing an instance of 'std::system_error' what(): Resource deadlock avoided

I have a simple client /server application the code of which is mentioned below. Please run the server in one shell and ... (); } return 0; } See Question&Answers more detail:os...

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

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432 views

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c++ - Decimal to binary (and vice-versa)

Can anybody give an example of c++ code that can easily convert a decimal value to binary and a binary value to decimal please? See Question&Answers more detail:os...

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

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443 views

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c++ - Rendering pixels from array of RGB values in SDL 1.2?

I'm working on a NES emulator right now and I'm having trouble figuring out how to render the pixels. I am ... use a 256 x 224 window size. See Question&Answers more detail:os...

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

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408 views

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c++ - Use std::uniform_int_distribution and define its range later

I have problem where I want to create a std::uniform_int_distribution in a struct and then give its range later. Below ... ; How do I 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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258 views

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c++ - How to verify algebraic statements using boost::spirit?

I'm trying to extend the calculator example so that instead of parsing and evaluating an algebraic expression ... is greatly appreciated! See Question&Answers more detail:os...

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

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386 views

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c++ - What does "1.$" mean?

I'm printing a variable using cout in Visual C++ 2010 and it shows "1.$". What does it mean? Google does ... I haven't modified cout's defaults See Question&Answers more detail:os...

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

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499 views

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c++ - Is a vector with incomplete type allowed if absolutely no member functions are called? If so, since when?

Suppose I have some incomplete type // in foo.hh struct Hidden; that I want to use as element type of a ... in my answer to another question. See Question&Answers more detail:os...

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

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417 views

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c++ - Why does scanf appear to skip input?

I am confused about scanf's behaviour in the following program. scanf appears to input once, and then not ... reason of all happening above? See Question&Answers more detail:os...

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

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550 views

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c++ - Compiling in Eclipse with gcc's -lpthread and -lrt set

I am currently trying to use Eclipse to develop some code that I've been doing in a text editor in C. ... Eclipse's GCC command line arguments? See Question&Answers more detail:os...

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

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598 views

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c++ - Print __float128, without using quadmath_snprintf

In my question about Analysis of float/double precision in 32 decimal digits, one answer said to take a look at ... answer was a negative one. See Question&Answers more detail:os...

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

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448 views

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c++ - static_assert and class templates

I have a problem with the static_assert feature. When I instantiate a class template directly, everything works as ... But this is incorrect. See Question&Answers more detail:os...

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

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592 views

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c++ - Wow64DisableWow64FsRedirection on 32-bit Windows XP

I'm writing a program in Visual Studio C++ which needs to run natively as a 32-bit process on any ... advent of consumer 64-bit Windows. 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++ - Virtual Functions Object Slicing

My question is with reference to this question which explains how virtual functions work in case of object slicing which ... up calling A::func See Question&Answers more detail:os...

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

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522 views

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c++ - What does ComPtr.As() do?

I am working on learning DirectX 12 from some examples but I am having trouble understanding what does the ComPtr.As() ... // What does this do? See Question&Answers more detail:os...

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

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828 views

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c++ - Default argument of type "const char *" is incompatible with parameter of type "char *"

So I got this code from my teacher but it doesn`t work combined with other code, it works only if it is separatly ... ) { strcpy_s(name, sir); } See Question&Answers more detail:os...

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

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379 views

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c++ - How to set redirect_uri using QOAuth2AuthorizationCodeFlow and QOAuthHttpServerReplyHandler

For OAuth 2.0 using QT's networkauth and the new QOAuth2AuthorizationCodeFlow object, how can I set the redirect_uri? My ... } Is this a bug? See Question&Answers more detail:os...

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

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