Recent questions tagged C++

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I have to debug a c++ project, but as one dependency doesn't compile in debug mode and I haven't been able ... 's the best way find the error. 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 I create a header-only library?

I'd like to package a library I'm working on as a header-only library to make it easier for clients to use ... a library to make it header-only? 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 libraries - build only what I need

I downloaded the Boost libraries and now I want to build only a few of the libraries. What would be the ... I put the header-only libraries? 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 decltype and how is it used?

I haven't been able to find a good explanation of decltype. Please tell me, as a beginning programmer, ... explanation would be very helpful. 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 the difference between C++0x and C++11?

I see mixed usage of these two terms here on SO. Wikipedia says C++11, also formerly known as C++0x ... but ... for? My guess - like a variable? 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 faster: inserting into a priority queue, or sorting retrospectively?

What's faster: inserting into a priority queue, or sorting retrospectively? I am generating some items that I need ... a sort algorithm at end? 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++ - Grayscale to Red-Green-Blue (MATLAB Jet) color scale

I was given a data set that is essentially an image, however each pixel in the image is represented as a ... the Jet gradient. Thanks, Adam 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++ - Difference between classes and namespaces?

I'm looking at namespaces and I don't really see a difference between these and classes. I'm teaching ... in advance for your assistance. 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++ - Using 3rd party header files with Rcpp

I have a header file called coolStuff.h that contains a function awesomeSauce(arg1) that I would like to use in ... D), hopefully 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++ - How expensive is it to dereference a pointer?

How expensive is it to perform the dereference operation on a pointer? I can imagine that the memory ... dereference operation part 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++ - What are the differences between CV_8U and CV_32F and what should I worry about when converting between them?

I have some code that is acting up and I suspect it's because I'm operating on the wrong types of data ... sure of when converting between 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++ - Replace an element into a specific position of a vector

I want to replace an element into a specific position of a vector, can I just use an assignment: // vec1 and 2 ... iterator+(i+1), vec2[i]); 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 qualified-id/name and unqualified-id/name?

I was wondering if someone could explain there terms since I encounter them in many places. I know some ... one please explain these terms? 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 declare a function that accepts a lambda?

I read on the internet many tutorials that explained how to use lambdas with the standard library (such as std::find ... - "10" as its argument? 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++ - Compiler error: memset was not declared in this scope

I am trying to compile my C program in Ubuntu 9.10 (gcc 4.4.1). I am getting this error: Rect.cpp:344: ... ). Please tell me what am I missing. 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++ - Static member functions error; How to properly write the signature?

I am getting an error when trying to compile my code in g++ using the current signature: cannot declare member ... void deleteAll(Node *p); 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 by value faster than pass by reference

I made a simple program in c++ to compare performance between two approaches - pass by value and pass by reference. Actually ... ) { val *= 5; } 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++ - Lambda as function parameter

What's the notation for declaring a lambda variable, or function parameter, without the use of auto or templates? ... if that were not possible. 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++ - Required and Optional Arguments Using Boost Library Program Options

I'm using Boost Program Options Library to parse the command line arguments. I have the following requirements: Once ... the main routine here } 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 is memmove faster than memcpy?

I am investigating performance hotspots in an application which spends 50% of its time in memmove(3). The ... great answers and comments! 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 isn't std::initializer_list a language built-in?

Why isn't std::initializer_list a core-language built-in? It seems to me that it's quite an important ... there are many other approaches. 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 should you not use virtual destructors?

Is there ever a good reason to not declare a virtual destructor for a class? When should you specifically avoid writing one? 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 the fast integer types faster than the other integer types?

In ISO/IEC 9899:2018 (C18), it is stated under 7.20.1.3: 7.20.1.3 Fastest minimum-width integer types 1 ... in the header file of stdint.h. 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++ - Shared pointer to an immutable type has value semantics

Sean Parent gave a talk at Going Native 2013 titled Inheritance Is The Base Class of Evil. At 20 minutes, 50 ... type (std::shared_pointer<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++ - 3d reconstruction from 2 images without info about the camera

I'm new in this field and I'm trying to model a simple scene in 3d out of 2d images and I dont have any info ... ? cv::waitKey(); 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++ - Understanding c++11 memory fences

I'm trying to understand memory fences in c++11, I know there are better ways to do this, atomic variables and so on ... t1.join(); t2.join(); } 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++ - Cross-compilation for Raspberry Pi in GCC. Where to start?

TL/DR: Where can I find more information about building a GCC 4.7.0 cross-compiling toolchain for ARM (gnueabi) ... could be the cause of 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++ - gcc -g :what will happen

This question was asked to me in an interview. they asked me how to generate a core dump file with which i can ... me what exactly does it 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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