Recent questions tagged C++

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I have an audio file and I am iterating through the file and taking 512 samples at each step and then passing ... wrong with what I'm doing? 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 handle execvp(...) errors after fork()?

I do the regular thing: fork() execvp(cmd, ) in child If execvp fails because no cmd is found, how can I notice this error in parent process? 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++ - TCP simultaneous open and self connect prevention

TCP standard has "simultaneous open" feature. The implication of the feature, client trying to connect to local port ... is not commonly known. 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++ - Getting cURL to work with Visual Studios 2017

*Edit: I got CURL working in VS 2017 on a 64 bit machine following these steps (see below for original ... this example I get linker errors. 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++ - This code is meant to output Hello World. but it outputs 0x22fed8

I'm learning File Handling in C++, but there is a problem here. I am trying to read a file. This code is meant ... 0; } What am I doing 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++ - Building a subset of boost in windows

I'm trying setup a subset of boost and get it properly compiled using bjam, however I'm not getting ... =static Changed scoped_ptr to smart_ptr 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 my own prebuilt shared library in an Android NDK project

I came across this post that is almost what I need: How to compile a static library using the Android NDK? ... anyone help me out 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++ - How to rollback lines from cout?

I'm coding a task monitoring, which updates tasks' progress using cout. I'd like to display one task progress per ... () returns -1 (failure). 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++ - Should I write constructors using rvalues for std::string?

I have a simple class: class X { std::string S; X (const std::string& s) : S(s) { } }; I' ... should use it's move constructor when 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++ - Is it more efficient to return a const reference

E.g. What's best out of these: std::string f() {} or const std::string& f() {} 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++ - Concatenating strings (and numbers) in variadic template function

I am attempting to write a function that takes a variety of strings or numbers (that work with std::to_string ... make the above 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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c++ - Static member functions

After reading sbi and Eli Bendersky's answers in this question I started to wondering what static member functions are ... to a friend free 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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c++ - Constructing a vector with istream_iterators

I recall once seeing a clever way of using iterators to read an entire binary file into a vector. It ... I completely misremembering this idiom? 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 skip common classes in VS 2008 when stepping in?

How can I skip common classes in VS 2008 debugger when stepping in? For example, I do not want debugger to ... 2005 and earlier, but not 2008 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 does EnumWindows return more windows than I expected?

In VC++, I use EnumWindows(...), GetWindow(...), and GetWindowLong(), to get the list of windows and ... geek here please help me 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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c++ - Why is the move constructor neither declared nor deleted with clang?

Consider the following classes. struct with_copy { with_copy() = default; with_copy(with_copy const&) {} with_copy& operator ... . Who's right? 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++ - Converting byte array (char array) to an integer type (short, int, long)

I was wondering if system endianness matters when converting a byte array to a short / int / long. Would this be incorrect to ... << 8) | (b[3]) 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++ - Programmatically disable/enable network interface

I'm trying to come up with a solution to programmatically enable/disable the network card - I've done a ton of ... script does in C++. 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++ - How do I store a function to a variable?

I think they are called functors? (it's been a while) Basically, I want to store a pointer to a function in a ... make: *** [hPif] Error 1 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 only build auto generated code when the generator or input changes in CMake?

I am working on a source code repository that generates some C++ code by running a python script outputting ... a variable number of files. 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++ - Difference between WH_KEYBOARD and WH_KEYBOARD_LL?

What is the difference between the working of two? For WH_KEYBOARD_LL, I read that it Installs a hook procedure ... low-level keyboard events? 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++ - Should I always move on `sink` constructor or setter arguments?

struct TestConstRef { std::string str; Test(const std::string& mStr) : str{mStr} { } }; struct TestMove { std::string ... = std::move(str); } }; 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++ - need a virtual template member workaround

I need to write a program implementing the visitor design pattern. The problem is that the base visitor class is ... virtual ~BaseVisited(); } 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++ - Insert into vector having objects without copy constructor

I have a class whose copy constructors are explicitly deleted (because A uses pointers internally and I don't ... to be explicitly defined? 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 does this function do?

I am reading a program which contains the following function, which is int f(int n) { int c; for (c=0; ... what does this function intend to 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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c++ - Best way of checking if a floating point is an integer

[There are a few questions on this but none of the answers are particularly definitive and several are out of date ... ? Is there a better 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++ - Using C++11 range-based for loop correctly in Qt

According to this talk there is a certain pitfall when using C++11 range base for on Qt containers. Consider: QList ... I would like to hear 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++ - How to create a new process with a lower Integrity Level (IL)?

It seems that starting with Windows Vista, processes with a lower integrity level (IL) cannot send messages to ... before modifying it as well. See Question&Answers more detail:os...

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

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