Recent questions tagged C++

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c++ - How to construct a std::string from a std::vector<string>?

I'd like to build a std::string from a std::vector<std::string>. I could use std::stringsteam, but imagine ... } How else might I 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++ - When does Endianness become a factor?

Endianness from what I understand, is when the bytes that compose a multibyte word differ in their order, at ... endianness? Thanks in advance! 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++ - Faster than binary search for ordered list

is there an algorithm that is faster than binary search, for searching in sorted values of array? in my case, I have a ... of A[n] and A[n+1] 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++ - Implementing Gaussian Blur - How to calculate convolution matrix (kernel)

My question is very close to this question: How do I gaussian blur an image without using any in-built ... any small example image matrix. 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 Boost.Lockfree queue is slower than using mutexes

Until now I was using std::queue in my project. I measured the average time which a specific operation on this queue ... 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++ - boost::unique_lock vs boost::lock_guard

I don't well understand the difference betweeen these two lock classes. In boost documentation it is said, boost:: ... the lock() function ? 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 make CMake use GCC instead of Clang on Mac OS X?

I can't find any info on it, but only the other way around (e.g., how to set CMake to use clang). I've ... C compiler: /usr/bin/gcc -- 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 does the Viola-Jones face detection method work?

Please explain to me, in few words, how the Viola-Jones face detection method 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++ - Fastest technique to pass messages between processes on Linux?

What is the fastest technology to send messages between C++ application processes, on Linux? I am vaguely aware ... and what is the fastest? 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 a “memory stomp”?

I just came across this blog post which mentions stomping memory : a C++ program which is easily capable of ... memory? When does it occur? See Question&Answers more detail:os...

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

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298 views

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c++ - What does int & mean

A C++ question, I know int* foo(void) foo will return a pointer to int type how about int &foo(void) what does it return? Thank a lot! 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 x += a quicker than x = x + a?

I was reading Stroustrup's "The C++ Programming Language", where he says that out of two ways to add something ... things, how do I check? 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++ - Iterating over different types

Given the following code: struct Window{ void show(); //stuff }w1, w2, w3; struct Widget{ void show( ... item in the conceptual list 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++ - How to update std::map after using the find method?

How to update the value of a key in std::map after using the find method? I have a map and iterator declaration ... I'm using Visual C++ 2010. 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 Many default methods does a class have?

Sorry, this might seem simple, but somebody asked me this, and I don't know for certain. An empty C++ class ... that it? Or are there more? See Question&Answers more detail:os...

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

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215 views

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c++ - tidy code for asynchronous IO

Whilst asynchronous IO (non-blocking descriptors with select/poll/epoll/kqueue etc) is not the most documented thing on ... that I'm chasing! See Question&Answers more detail:os...

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

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242 views

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c++ - array of vectors or vector of arrays?

I'm new to C++ STL, and I'm having trouble comprehending the graph representation. vector<int> adj[N]; So does this ... N; and vector<int> F[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++ - Mixing Qt and Boost

I'm looking at starting a project in C++ using the Qt 4 framework (a cross-platform GUI is required). I' ... use them both in the same project? 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++ - Expression templates and C++11

Let's look at one particular benefit of expression templates: ETs can be used to avoid vector-sized temporaries in ... %edx movl %edx, 16(%rsp) 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++ - rc.exe no longer found in VS 2015 Command Prompt

I just installed Windows 10 Creators Update (version 10.0.15063). I have multiple versions of Visual Studio ... : Installed VS 2017 components: See Question&Answers more detail:os...

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

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601 views

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c++ - How to overcome "'aclocal-1.15' is missing on your system" warning?

Im trying to run a c++ program on github. (available at the following link https://github.com/mortehu/text- ... can not get that to 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++ - Reset C int array to zero : the fastest way?

Assuming that we have a T myarray[100] with T = int, unsigned int, long long int or unsigned long long int, what ... T *myarray = new T[100]. 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++ - #include in .h or .c / .cpp?

When coding in either C or C++, where should I have the #include's? callback.h: #ifndef _CALLBACK_H_ #define ... both like I have done 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++ - Is it safe to parse a /proc/ file?

I want to parse /proc/net/tcp/, but is it safe? How should I open and read files from /proc/ and not be ... be changing it in the same time? 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 does it mean for a data structure to be "intrusive"?

I've seen the term intrusive used to describe data structures like lists and stacks, but what does it mean? ... ? What are the disadvantages? See Question&Answers more detail:os...

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

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117 views

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c++ - Suffix Array Algorithm

After quite a bit of reading, I have figured out what a suffix array and LCP array represents. Suffix array ... maybe, is highly appreciated. 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 read a segfault kernel log message

This can be a very simple question, I'm am attempting to debug an application which generates the following segfault ... ] = address of symbol? See Question&Answers more detail:os...

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

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182 views

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c++ - Usage and Syntax of std::function

It is necessary to me to use std::function but I don't know what the following syntax means. std::function< ... make a pointer to a function? See Question&Answers more detail:os...

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

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