Recent questions tagged C++

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c++ - How do I get a const_iterator using auto?

First question: is it possible to "force" a const_iterator using auto? For example: map<int> usa; //...init ... <int>::iterator. Any suggestion? 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 Use of ' ' escape sequence?

I have C code like this: #include<stdio.h> int main() { printf("Hey this is my first hello world " ... produce different output, ignoring the ? 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++ - When is an integer<->pointer cast actually correct?

The common folklore says that: The type system exists for a reason. Integers and pointers are ... AtomicMarkableReference) Anything more? 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++ - Get elapsed time in Qt

I'm looking for the equivalent in Qt to GetTickCount() Something that will allow me to measure the time it takes ... ) - start; any suggestions? 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 std::transform and similar cast the 'for' loop increment to (void)?

What is the purpose of (void) ++__result in the code below? Implementation for std::transform: // std:: ... (*__first); return __result; } 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 ((a + (b & 255)) & 255) the same as ((a + b) & 255)?

I was browsing some C++ code, and found something like this: (a + (b & 255)) & 255 The double AND annoyed me, ... b + " mismatch!"); break; } } 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++ - boost::asio async server design

Currently I'm using design when server reads first 4 bytes of stream then read N bytes after header decoding. ... debug where actual delay is? 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++ - Generating a Hardware-ID on Windows

What is the best way to generate a unique hardware ID on Microsoft Windows with C++ that is not easily ... example changing the MAC Address)? 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++ - Low latency serial communication on Linux

I'm implementing a protocol over serial ports on Linux. The protocol is based on a request answer scheme so ... controller uses is an 16550A. 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++ - Passing a pointer to a class member function as a parameter

I have written a small program where I am trying to pass a pointer to member function of a class to ... on bound member function expression 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++ - Library not found for -lfl

I was using flex and bison to build a simple calculator project I cloned from Github. But after I typed make ... could I resolve this problem? 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++ - Passing Function Pointer

I'm a bit confused as to how I would pass a pointer to a pointer function. I have a function that takes a pointer ... isSet) { ... more code } See Question&Answers more detail:os...

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

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176 views

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c++ - simple Pointer initialization

It has been a while that I used pointers and I just wanna quickly check how I can initialize an integer pointer? ... during mem::copy... Weird! 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++ - Clang on Windows

First of all, I've followed "Getting Started: Building and Running Clang". In particular, I've built it ... do in the screenshot 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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c++ - Use D3D11 debug layer with VS2013 on Windows 10

In my D3D 11 projects, I always add #if (defined(DEBUG) || defined(_DEBUG)) deviceFlags |= ... on Windows 10 with VS2013? See Question&Answers more detail:os...

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

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201 views

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c++ - Inline keyword vs header definition

What's the difference between using the inline keyword before a function and just declaring the whole function in the header ... ) { return 4; } See Question&Answers more detail:os...

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

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193 views

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c++ - How can I use the TRACE macro in non-MFC projects?

I want to use the TRACE() macro to get output in the debug window in Visual Studio 2005 in a non-MFC C++ ... window and how can I do that? 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 SetUnhandledExceptionFilter cannot capture some exception but AddVectoredExceptionHandler can do

I have experienced a problem that the function I passed to the SetUnhandledExceptionFilter didn't get called when the ... 99; 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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369 views

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c++ - If I delete a class, are its member variables automatically deleted?

I have been researching, and nothing relevant has come up, so I came here. I am trying to avoid memory ... in the destructor of MyClass? 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 does a reference-counting smart pointer's reference counting work?

In other words, how does the implementation keeps track of the count? Is there a map-like object maintained which is ... , how can I avoid them? See Question&Answers more detail:os...

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

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237 views

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c++ - Virtual destructor with virtual members in C++11

In these slides about C++11/14 standard, on slide 15, the author writes that "many classic coding rules [ ... if you have virtual members? See Question&Answers more detail:os...

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

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617 views

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c++ - Best way to seed mt19937_64 for Monte Carlo simulations

I'm working on a program that runs Monte Carlo simulation; specifically, I'm using a Metropolis algorithm. ... anyone have any suggestions? See Question&Answers more detail:os...

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

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197 views

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c++ - Windowless OpenGL

I would like to have a windowless OpenGL context (on both GNU/linux with Xorg and Windows). I'm not going ... ) based on the accepted answer. See Question&Answers more detail:os...

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

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238 views

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c++ - Special Characters in Content-Disposition filename

My question is a duplicate of How to encode the filename parameter of Content-Disposition header in HTTP? But ... download list as filename. 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::vector<std::string> to char* array

I have a std::vector<std::string> that I need to use for a C function's argument that reads char* foo. ... and create std::vector<std::string>. See Question&Answers more detail:os...

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

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886 views

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c++ - typecasting Eigen::VectorXd to std::vector

Their are many links to go the other way round but I am unable to find to get a std::vector from a ... Eigen::VectorXd in my specific case. See Question&Answers more detail:os...

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

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249 views

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c++ - Macros to disallow class copy and assignment. Google -vs- Qt

To disallow copying or assigning a class it's common practice to make the copy constructor and assignment ... difference between the two? See Question&Answers more detail:os...

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

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230 views

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c++ - Is std::string part of the STL?

(When I say STL, I'm talking about the template library that revolves around containers, iterators, algorithms ... STL developed by Stepanov? See Question&Answers more detail:os...

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

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