Recent questions tagged c++

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c++ - type requirements for std::vector<type>

I am still confused about the requirements for a type to be used with a std::vector in C++11, but this may ... , how to get the code working? 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 can I better learn to "not pay for what you don't use"?

I've just gotten answers to this question which, at the bottom line, tell me: "Doing X doesn't make ... myself on following this principle? 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++ - Rcpp: my distance matrix program is slower than the function in package

I would like to calculate the pairwise euclidean distance matrix. I wrote Rcpp programs by the suggestion of Dirk ... (like method, diag). 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++ - To find combination value of large numbers

I want to find (n choose r) for large integers, and I also have to find out the mod of that number. long ... method to do that please tell me. 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 you use clang's new custom size int feature?

Recently, I heard that clang got a new feature, _ExtInt. I know that it lets you specify the size of an integer ( ... , but how do you use 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++ - Customizing CGAL Kernel with my own Point class

I would like to use a custom Point class with the CGAL constrained delaunay triangulation. However, with ... (cgal_p1, cgal_p2); 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++ - DLL memory manager mixup

I wrote an application which allows people to contribute plugins to extend the functionality. Such plugins are deployed ... in the framework). 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++ - BGR to HSV and back again

The documentation does not seem to explain what the expected range of the input is for an HSV->BGR conversion. Here ... std::endl; 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++ - Factoring out common parts of Spirit rules

I have a lot of rules that have common prefix and suffix: rule = begin_stuff >> some >> other >> ... refactor Spirit rules in this fashion? 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++ - FLTK version 1.3.2, Visual studio 2012 and the first example of Stroustrup's PPP book

PLEASE, just look at each step that I want to do and if any step is wrong just tell me to revise it. 1- ... what any more effort I can 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++ - Pass compound compiler options using cmake

I am trying to pass "compound" options to the compiler using cmake's add_compile_options. That is, options ... these options with CMake? 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++ - Issue declaring extern class object

Let me start by saying I've extensively searched for answers on google and more specifically here. The thing is I ... does not make any sense. 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++ - Iterator invalidity after calling erase

I am confused a bit. What I have learned or been told is that an iterator of a vector becomes invalid if ... endl; } Thanks for any feedbacks! 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 do references occupy memory when member of a class?

I have been told that references, when they are data members of classes, they occupy memory since they will ... they are temporary 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++ - Curly braces constructor prefers initializer_list over better match. Why?

#include <vector> using std::size_t; struct Foo { Foo(size_t i, char c) {} }; Foo Bar1() { size_t ... statement without writing the type again? 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 read from serial port like picocom on Linux?

I have a gps module that sends data (NMEA sentence) every 1 seconds to the serial port. I've been trying to ... or maybe VTIME and VMIN flags ? 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++ - Initialize a vector of pairs in one line

I want to initialize a std::vector (of std::pair), with k objects, with the pair of values shown below. Here ... const std::pair<float, int>&}' 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++ - Poco stops after SMTPClientSession.login

I just started with the Poco library and tried to create an email program (Which I knew virtually nothing about). ... So what's going on? See Question&Answers more detail:os...

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

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355 views

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c++ - Alignment and SSE strange behaviour

I try to work with SSE and i faced with some strange behaviour. I write simple code for comparing two strings with ... -Wcast-qual -o main.exe 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++ - Prime number generation algorithm

Please look at the following and see if you could advise. cout << "2" << endl; cout << "3" << endl ... slow over time as the vector gets longer. See Question&Answers more detail:os...

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

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567 views

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c++ - gnuplot-cpp cannot feed command to pipe

I'm using gnuplot-cpp to draw math graphs using C++. As I vaguely understand, this is an interface ... contain some of my supplementary edits See Question&Answers more detail:os...

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

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450 views

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c++ - What part of dereferencing NULL pointers causes undesired behavior?

I am curious as to what part of the dereferencing a NULL ptr causes undesired behavior. Example: // #1 ... passing NULL into anotherfunc() ? See Question&Answers more detail:os...

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

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689 views

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c++ - No default constructor found

I don't want to use the default constructor so I implement mine class A { public: A(int&i); A& ... appropriate default constructor of A found. See Question&Answers more detail:os...

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

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762 views

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c++ - ctypes.ArgumentError when calling DLL functions with Python

I'm using ctypes to call functions in a DLL file according to a description file that describe the DLL ... Thank you for your attention! 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++ - sparse sparse product A^T*A optim in Eigen lib

In the case of multiple of same matrix matA, like matA.transpose()*matA, You don't have to compute all result ... matA).pruned()).toDense(); See Question&Answers more detail:os...

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

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363 views

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c++ - How do I get textures to work in OpenGL?

I'm using the tutorials on http://arcsynthesis.org/gltut/ to learn OpenGL, it's required, I have to use ... stuff, but we got nothing running. 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++ - COM: Getting GUID of coclass object using pointer to interface it implements

Having pointer to COM interface that are implemented by some concrete component class object is it possible to get ... class (say MCanvasFont). 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++ - no appropriate default constructor available error

here is my code: class package { protected: string name; string city; string state; int zip; double weight; ... 't running. please help me. See Question&Answers more detail:os...

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

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