Recent questions tagged c++

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If I have a time_point for an arbitrary clock (say high_resolution_clock::time_point), is there a way to convert it to ... in the spec at all? 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 and how is conversion to char pointer allowed?

We can look at the representation of an object of type T by converting a T* that points at that object into a ... I rely on when 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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c++ - OpenCV: Taking a 3 channel RGB image, splitting channels and viewing an image with only R+G

I wanted to look at only the R+G channels in an RGB image because I get better contrasts to detect an object ... use cvMixChannels() to 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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c++ - switch-case statement without break

According to this book I am reading： Q What happens if I omit a break in a switch-case statement? A ... understanding how it all works. 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++ - Function returning pointer to itself?

Is it possible in C++ to write a function that returns a pointer to itself? If no, suggest some other solution to ... the numbers from 1 to n. 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 Log 2.0 : empty Severity level in logs

I'm using Boost-Log 2.0, which has some differences from version 1, and I have a hard time ... -lboost_date_time -lboost_thread -o main 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 doesn't this enum convert to int?

Why does the following code not compile under g++ (C++14), MSVC (C++14), or ARM (C++03)? The ... note: candidate expects 1 argument, 0 provided 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 are signals and slots?

Can someone explain in simple terms the "signals and slots" pattern? 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 destructors and deleting objects with multiple inheritance... How does it work?

First, I understand why virtual destructors are needed in terms of single inheritance and deleting an object through a ... how does this 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++ - Efficient way to compute geometric mean of many numbers

I need to compute the geometric mean of a large set of numbers, whose values are not a priori limited ... of the accumulated product separately? 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 LNK1104: cannot open file 'MSVCRTD.lib'

I'm a novice C++ developer. I encontered the error message indicates "LINK :fatal error LNK1104: cannot open file ' ... case. What should I 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++ - Do I have to use the OpenGL data types (GLint, CLchar, ...) for a cross platform game?

I have a short question. Why does OpenGL come with its own datatypes for standard types like int, unsigned int, ... GLchar* instead of char*. 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 macros with zero arguments

I am working on a call macro, #define CALL(f,...) FN(f)->call((ref(new LinkedList()), __VA_ARGS__)) ... if I separate the the calls it works 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 are there two overloads for vector::push_back?

Why doesn't vector::push_back take a forwarding reference instead of having two overloads? I've read that the ... other than moving/copying? 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++ - Must a deleted constructor be private?

class A { public: A() = default; A(const A&) = delete; }; class A { public: A() = default; ... always identical to each other in any cases? 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++ - 64bit Applications and Inline Assembly

I am using Visual C++ 2010 developing 32bit windows applications. There is something I really want to use ... application compatible with 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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c++ - What is #pragma used for?

Can anyone help me understand #pragma? ifndef TARGET_OS_LINUX #pragma once endif What,when, where, why, an example? ... I am refactoring.... 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++ - (Re)named std::pair members

Instead of writing town->first I would like to write town->name. Inline named accessors (Renaming first and second ... . Maybe it's impossible. 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 boost bind work behind the scenes in general?

Without spending a long time reviewing the boost source code, could someone give me a quick rundown of how boost bind is implemented? 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 are C++11 lambdas represented and passed?

Passing a lambda is really easy in c++11: func( []( int arg ) { // code } ) ; But I'm ... somehow pass differently than regular C++ structs? 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++ - Deleting a reference

Is this valid? An acceptable practice? typedef vector<int> intArray; intArray& createArray() { intArray *arr = new ... &array; 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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c++ - std::vector: vec.data() or &vec[0]

When you want access a std::vector as a C array you can choose from at least four different ways, as you ... lot of documentation about 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++ - Does structured binding work with std::vector?

Is it possible to use structured binding with vectors? E.g. std::vector<int> vec{1, 2, 3}; auto [a, ... values of a vector to three variables. 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++ - Constructor for '' must explicitly initialize the reference member ''

I have this class class CamFeed { public: // constructor CamFeed(ofVideoGrabber &cam); ofVideoGrabber &cam; }; And ... way to get around 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++ - Branch-aware programming

I'm reading around that branch misprediction can be a hot bottleneck for the performance of an application. As ... and benchmarks are welcome. 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 there a way to disable all warnings with a pragma?

I've started a new project and have decided to make sure it builds cleanly with the /Wall option enabled. The ... for this stretch of 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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c++ - size_t vs int warning

I am getting following warning always for following type of code. std::vector v; for ( int i = 0; i < v ... all my loop variable of type size_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++ - Exception Handling and Opening a File?

Is it possible to use exceptions with file opening as an alternative to using .is_open()? For example: ... , what type is someException? See Question&Answers more detail:os...

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

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