Recent questions tagged C++

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c++ - Does the unary + operator have any practical use?

Was the unary + operator only included for symmetry with the unary - operator, or does it find some practical use ... more common C++ code? 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++ - "Permanent" std::setw

Is there any way how to set std::setw manipulator (or its function width) permanently? Look at this: #include ... writing stuff into std::cout. 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 know underlying type of class enum?

I have a variable declared as: enum class FooEnum: uint64_t {} and I would like to cast to its base-type, ... myEnum))&myEnum; Is this possible? 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::vector to string with custom delimiter

I would like to copy the contents of a vector to one long string with a custom delimiter. So far, I've ... what the compiler is expecting here? 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 parse mustache with Boost.Xpressive correctly?

I have tried to write a mustache parser with the excellent Boost.XPressive from the brilliant Eric Niebler. But since this ... != str.end() ); 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++ - Can't access derived class method from pointer of type base class

I should specify that I'm a bit new to OOP. I'm tying to make a vector of type pointer to Person that has ... int& GetSpg(){ return spg; }; 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 OpenMP under ubuntu 12.04 is slower than serial version

I've read some other questions on this topic. However, they didn't solve my problem anyway. I wrote the ... 11.854656 from serial: 16.960101 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 speed up this histogram of LUT lookups?

First, I have an array int a[1000][1000]. All these integers are between 0 and 32767 ,and they are known ... is the bottleneck of my program. 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 create a HelloWorld COM Interop in Visual Studio 2012

First off, I am new to COM, and currently quite confused. I've read a lot of documentation on COM ... to reflect the combined solution. 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++ - Remove 100,000+ nodes from a Boost graph

I have a graph ( adjacency_list (listS, vecS, bidirectionalS, VertexVal) ) in which I need to delete 100,000+ ... way to delete these vertices? 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 handle a ctrl-break signal in a command line interface

Before I begin, I want to clarify that this is not a command-line tool, but an application that accepts ... explanation makes more sense... 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++ - reinterpret_cast from object to first member

I was looking at this answer and I was wondering if casting an object to its first member with reinterpret_cast and using ... *>(&b))->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++ - What does an extra 0 in front of an int value mean?

Inspiring from a obfuscated piece of code, I have a small question regarding to assign value to an integer: #include ... 65 came from? Any idea? 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++ - const reference to a temporary object becomes broken after function scope (life time)

While asking this question, I learned const reference to a temporary object is valid in C++: int main () { ... the same as its const reference? 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++ - SSE2 intrinsics - comparing unsigned integers

I'm interested in identifying overflowing values when adding unsigned 8-bit integers, and clamping the result to ... performing this. 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++ - std::thread Why object is copied twice?

Why in the example code below, object is copied twice? According documentation constructor of thread class copies all arguments ... [~D] [~D] 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++ - Swapping Nodes on a single linked list

I am trying to make a swapNode function that can take any two nodes and swap them. I've made an algorithm that ... ->next; second->next = tmp; 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::vector to java.util.Vector code generation with swig

I try to generate java code with SWIG In MyList.h I declared a custom list object called _list List<T*> ... will be appreciated. Thank you. 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 could one implement std::auto_ptr's copy constructor?

Back on my crazy AutoArray thingy... (quoting important bits from there: class AutoArray { void * buffer; ... s copy semantics be possible? 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 create cv::Mat from buffer (array of T* data) using a template function?

I'd like to write a template function to copy data referenced by pointer T* image to cv::Mat. I am confusing how ... has any idea? Thank you!!! 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++ - Piping for input/output

This question follows from my attempt to implement the instructions in: Linux Pipes as Input and Output How to ... that program into a 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++ - Static variable initialization over a library

I am working on a factory that will have types added to them, however, if the class is not explicitly ... : http://codepad.org/Hc2tSfzZ 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++ - Can a copy-constructor take a non-const parameter?

I have this problem, there is a function foo() as follows, vector<ClassA> vec; void foo() { ClassA a; ... way can help accomplish the job? 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++ - Problem with compiling RInside examples under Windows

I am trying to setup RInside at work where we are forced to use a Windows environment. I have installed ... share! Thanks in advance, Christian 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 convert a value from host byte order to little endian?

I need to convert a short value from the host byte order to little endian. If the target was big endian, I could ... is not alright in my case. 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 standard clause mandates this lvalue-to-rvalue conversion?

Given: int main() { int x = 0; int y = x; // <--- } Could someone please tell me which clause of the ... , then I'd like to learn that too!) 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 properly delete a pointer to array

I'm new to C++, and I'm confused about arrays and pointers. Could someone tell me how I can properly delete a ... foo; or delete [] foo; 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++ - OpenCV fisheye calibration cuts too much of the resulting image

I am using OpenCV to calibrate images taken using cameras with fish-eye lenses. The functions I am using are: ... : Example of wanted result: See Question&Answers more detail:os...

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

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