Recent questions tagged C++

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c++ - Launch Failed. Binary not found. CDT on Eclipse Helios

I'm using Eclipse Helios on Ubuntu 10.04, and I'm trying to install CDT plugin on it. I download it from here ... me how to fix it? 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++ - How do you dynamically allocate a matrix?

How do you dynamically allocate a 2D matrix in C++? I have tried based on what I already know: #include <iostream ... for two. What should I do? 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++ - Default argument in the middle of parameter list?

I saw a function declaration in our code that looked as follows void error(char const *msg, bool showKind ... the compiler options used. 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++ - The copy constructor and assignment operator

If I override operator= will the copy constructor automatically use the new operator? Similarly, if I define a ... from the copy constructor? 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++ - M_PI works with math.h but not with cmath in Visual Studio

I am using Visual Studio 2010. I have read that in C++ it is better to use <cmath> rather than <math.h ... . Any clue why this is happening? 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++ - Printing prime numbers from 1 through 100

This c++ code prints out the following prime numbers: 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 ... 0, the number is no a prime number.) 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++ - MSVCP120d.dll missing

Every time I want to compile my Visual Studio project I get the message that MSVCP120d.dll is missing. Google can' ... /dn448963(v=vs.85).aspx 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++ - Using std::bind with member function, use object pointer or not for this argument?

When using std::bind to bind a member function, the first argument is the objects this pointer. However it ... correct, or are both correct? 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 give priority to privileged thread in mutex locking?

First of all: I am completely a newbie in mutex/multithread programming, so sorry for any error in advance... I have ... t2.join(); return 0; } 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++ - boost asio ssl async_shutdown always finishes with an error?

I have a small ssl client that I've programmed in boost 1.55 asio, and I'm trying to figure out why boost: ... the right way of shutting down). 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 get the real and total length of char * (char array)?

For a char [], I can easily get its length by: char a[] = "aaaaa"; int length = sizeof(a)/sizeof(char); // ... new char[10]; strcpy(a, "hello"); 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++ - Passing integers as constant references versus copying

This might be a stupid question, but I notice that in a good number of APIs, a lot of method signatures that ... const int &x and vice versa. 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 alpha blend RGBA unsigned byte color fast?

I am using c++ , I want to do alpha blend using the following code. #define CLAMPTOBYTE(color) if ((color) ... to speed this code? Many 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++ - Can I safely use OpenMP with C++11?

The OpenMP standard only considers C++ 98 (ISO/IEC 14882:1998). This means that there is no standard ... on the same data structures. 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++ - Linking dll in Visual Studio

How can I add a .dll in Visual Studio 2010? I just cannot find the option there. 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++ - Converting cv::Mat to IplImage*

The documentation on this seems incredibly spotty. I've basically got an empty array of IplImage*s (IplImage** ... appreciate some advice :) 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++ - Lambda expressions as class template parameters

Can lambda expressions be used as class template parameters? (Note this is a very different question than ... behind in their implementation? 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++ - Definition of int64_t

I am new to C/C++, so I have a couple of questions about a basic type: a) Can you explain to ... includes that provide a declaration of int64_t? 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++ - when g++ static link pthread, cause Segmentation fault, why?

#include <iostream> #include <map> #include <thread> #define SIZE 1024 #define AMOUNT 100000 #define THREADS 4 class ... occurred! confused... 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++ - Conversion function for error checking considered good?

I'd like to have a simple way of checking for an object to be valid. I thought of a simple conversion ... Is this considered a good practise? 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++ - Replacing ld with gold - any experience?

Has anyone tried to use gold instead of ld? gold promises to be much faster than ld, so it may help ... gold and blog entry explaining it) 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++ - Does std::mt19937 require warmup?

I've read that many pseudo-random number generators require many samples in ordered to be "warmed up". Is that the ... std::mt19937 gen(rd()); 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++ - Convert RGB to Black & White in OpenCV

I would like to know how to convert an RGB image into a black & white (binary) image. After conversion, how ... save the modified image to disk? 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 is std::min failing when windows.h is included?

#include <algorithm> #include <Windows.h> int main() { int k = std::min(3, 4); return 0; } What is windows ... error C2059: syntax error : '::' 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++ - error: use of deleted function

I've been working on some C++ code that a friend has written and I get the following error that I have ... when this type of error occurs? 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++ - Pointer-to-pointer dynamic two-dimensional array

First timer on this website, so here goes.. I'm a newbie to C++ and I'm currently working through the book "Data ... " "; } cout << endl; } 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++ - Programmatically reading a web page

I want to write a program in C/C++ that will dynamically read a web page and extract information from it. As ... page to get the specific data? 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++ - Fast n choose k mod p for large n?

What I mean by "large n" is something in the millions. p is prime. I've tried http://apps.topcoder.com/wiki/ ... , value)); return value; } } See Question&Answers more detail:os...

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

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