Recent questions tagged C++

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c++ - std::map of member function pointers?

I need to implement an std::map with <std::string, fn_ptr> pairs. The function pointers are pointers to ... , suggestions are also welcome. 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++ - What are use cases for structured bindings?

C++17 standard introduces a new structured bindings feature, which was initially proposed in 2015 and whose ... a discussion about variadicity. 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 cast simple pointer to a multidimensional-array of fixed size?

I have a function that takes a pointer to a floating point array. Based on other conditions, I know that pointer ... comment. Working in C++. 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++ - What is a nested name specifier?

Related to this I want to know what exactly is a nested name specifier? I looked up in the draft but I ... nested name specifier? delete p; } 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++ - Why is the std::initializer_list constructor preferred when using a braced initializer list?

Consider the code #include <iostream> class Foo { int val_; public: Foo(std::initializer_list<Foo> il) { std ... implicitly converted to a Foo. 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++ - Do STL iterators guarantee validity after collection was changed?

Let's say I have some kind of collection and I obtained an iterator for the beginning of it. Now let's ... valid according to STL standard?! 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++ - Use Visual Studio 2012 and compile with older platform toolset?

The problem I'm using Visual Studio 2012 to develop C++ DLLs. On some machines these DLLs can not be ... will run on non-developer machines? 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++ - What is assignment via curly braces called? and can it be controlled?

What is this called? Vec3 foo = {1,2,3}; Can it be controlled via an operator or some such? As in ... ? (Just an exercise in curiosity). 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 do I include the string header?

I'm trying to learn about strings, but different sources tell my to include different headers. Some say to use < ... . What is the proper usage? 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 worthwhile to use bit fields?

Is it worthwhile using C's bit-field implementation? If so, when is it ever used? I was looking through some ... to put on actual chips, etc) 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++ - shared_from_this causing bad_weak_ptr

I am trying to keep a list of connected clients in asio. I have adapted the chat server example from the docs ... exactly what I need to change. 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++ - Is there some ninja trick to make a variable constant after its declaration?

I know the answer is 99.99% no, but I figured it was worth a try, you never know. void SomeFunction(int ... on variables in a parallel section. 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++ - is size_t always unsigned?

As title: is size_t always unsigned, i.e. for size_t x, is x always >= 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++ - LNK2038: mismatch detected for 'RuntimeLibrary': value 'MT_StaticRelease' doesn't match value 'MD_DynamicRelease' in file.obj

I am Integrating Matlab, C and Cuda together in a project. I used Matlab mix in order to connect matlab mx ... 'MD_DynamicRelease' in file.obj. 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++ - Adding static libcurl to Code::Blocks IDE

I can't figure out how to properly add a static libcurl library to my Code::Blocks IDE. I want it static because ... s why I can not compile 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++ - Extracting 3D coordinates given 2D image points, depth map and camera calibration matrices

I have a set of 2D image keypoints that are outputted from the OpenCV FAST corner detection function. Using an ... do so? 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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c++ cli - C++CLI. Are native parts written in pure C++ but compiled in CLI as fast as pure native C++?

I want to delegate audio computing to a C++ layer, but handle and edit audio content through a WPF GUI. I have had ... or in a C++CLI assembly. 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::forward_list and std::forward_list::push_back

I'd like to use std::forward_list Because: Forward list is a container which supports fast insertion and removal of ... no reason to do 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++ - Programmatically access CPU fan on a laptop? (Windows)

Is there a Windows standard way to do things such as "start fan", "decrease speed" or the like, from C/ ... way to control the fan generically. 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++ - Problems with running EXE file built with Visual Studio on another computer

I created a client server application in C++ using Visual Studio. Now I want to run the client EXE ... installing anything on the computer? See Question&Answers more detail:os...

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

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288 views

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c++ - Reference to a pointer

char *str = "Hello"; char *ptr = str; char *&rptr = str; What is the difference between ptr and rptr ... in C++ implemented using pointers? See Question&Answers more detail:os...

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

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248 views

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c++ - compile time loops

I would like to know if it is possible to have sort of compile time loops. For example, I have the ... existed for similar cases. 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++ - Do C++11 regular expressions work with UTF-8 strings?

If I want to use C++11's regular expressions with unicode strings, will they work with char* as UTF-8 or ... convert them to a wchar_t* string? 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 should I brace-initialize an std::array of std::pairs?

std::array<std::pair<int, int>, 2> ids = { { 0, 1 }, { 1, 2 } }; VS2013 error: error C2440 ... resolution was ambiguous` What am I doing wrong? See Question&Answers more detail:os...

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

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615 views

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c++ - error while loading shared libraries: libboost_system.so.1.45.0: cannot open shared object file: No such file or directory

I am building a C++ executable on Linux. The executable links into some boost libraries. This is the output ... on today. Can anyone explain? See Question&Answers more detail:os...

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

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435 views

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c++ - When is std::chrono epoch?

std::chrono::time_point::time_since_epoch() returns a duration, referred to some time_point in the past. When is such ... to 1 January 1970 UTC? 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++ - copy vs std::move for ints

What's difference between default copy and std::move in that example? After move the object ... : 0x7fffffffe094 0x7fffffffe098 0x7fffffffe09c 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++ - Undefined Reference to

When I compile my code for a linked list, I get a bunch of undefined reference errors. The code is below. I have ... (2); node3.setElement(3); } See Question&Answers more detail:os...

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

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