Recent questions tagged C++

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c++ - Spirit X3: parser with internal state

I want to efficiently parse large CSV-like files, whose order of columns I get at runtime. With Spirit Qi, I ... , Spirit makes it a breeze 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++ - std::map::const_iterator template compilation error

I have a template class that contains a std::map that stores pointers to T which refuses to compile: template < ... a const_iterator to my map? 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++ - Reuse std::cin after eating an EOF

The unix command wc has this functionality: $ wc - - - aaa bbb ccc<EOF> 0 3 11 - aaa bbb ccc<EOF> 0 3 ... ::cin.beg), which also does not 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++ - Using Namespace std

I am taking a programming class in school and I wanted to start doing some c++ programming out of class. My ... Thanks in advance for the help. 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 find out if output stream chain is ended?

What I am trying to achieve? How can I find if a stream chain is ended? Look at the function ... using recursive variadic template 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++ - «F(5)» and «int x; F(x)» to call different functions?

I'd like to write two distinct functions to handle a constant value and a variable of a given type (viz., int). Here ... x,5) <=> functor(3,5). 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++ - Disjoint set as linked list

Can anyone point me to some info on Disjoint sets as linked list? I cant find any code on this. Language C++ 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 convert UTF-8 encoded std::string to UTF-16 std::string

How can i convert UTF-8 encoded std::string to UTF-16 std::string? Is it possible? And no, i can't use std: ... in my case. Windows, MSVC-11.0. 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++ - constexpr constructor with compile time validation

I'd like to build up a class with the option of constexpr-ness. And, of course, I'd like to take ... exception throwing from there! Any idea? 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++ - Automatically Creating Wrappers for Classes Loaded with dlopen()

I'm writing a proxy class that loads a shared library with dlopen() and forwards its member functions to ... interface to high level languages. 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 there a way to automatically have a #define reproduced in each source file

I'd like the following to appear in every source file in my Visual C++ 2005 solution: #define DEBUG_NEW new( ... copying it in? Compiler option? 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++ - Recursively searching for files in the computer

I am trying to recursively search for files in the computer using WinAPI: FindFirstFile and FindNextFile I do not ... my error? Thank you! 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++ - Cannot get Boost Spirit grammar to use known keys for std::map<>

I seem to be experiencing some mental block with Boost Spirit I just cannot get by. I have a fairly simple ... , so thank you 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++ - Setting up Qt for CLion

i am struggling to set up Qt5 for CLion. Somehow, I did this for VS before but failed to do this in CLion ... 3 I looking forward for any hints. 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 set bitrate correctly for aac encoding OSX

I have a 1 second PCM data which I write into an AAC file successfully. However, I can not control the ... can I set the bitrate correctly? 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++ - 2d char array to CUDA kernel

I need help with transfer char[][] to Cuda kernel. This is my code: __global__ void kernel(char** BiExponent){ ... 2012 -ccbin Thanks for help. 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++ - connection 'qt_sql_default_connection' is still in use, all queries will cease to work

I've made separate functions for open and close connection.But it wont let me to add new record on new form. ... all queries will cease 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++ - How can a template function 'know' the size of the array given as template argument?

In the C++ code below, the templated Check function gives an output that is not what I would like: it's 1 ... be iterated upon for unit tests. 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++ - Default Initialization Versus Zero Initialization

I cannot understand the behavior of gcc 4.8.1 or Visual Studio 2015 with respect to default initialization ... gives me: 50790236 51005888 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++ - glGetTexImage reads too much data with texture format GL_ALPHA

I'm trying to retrieve the pixel information for an alpha-only texture via glGetTexImage. The problem is, the ... my array is large enough? 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++ - Cout long double issue

So, I'm working on a C++ project. I have a var of long double type and assigned it a value like "1.02" ... Compiler: minGW IDE: NetBeans 8.0.2 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++ - C++0x: How can I access variadic tuple members by index at runtime?

I have written the following basic Tuple template: template <typename... T> class Tuple; template <uintptr_t N ... might improve this solution? 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++ - CImg X11 Linking Error using CLion and CMake

I have a C++ project in CLion (Ubuntu) that uses the CImg library. Currently, I cannot get the project to ... do not have Magick++ installed.) 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++ - variadic templates with template function names

following this question , I am trying to avoid copy-pasting some code related to calling all of the same-named methods ... .t.hpp" ? Thank you 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++ - imread(openCV),QString unicodes

cv::Mat img = cv::imread("../赤月/lena.jpg"); if(img.empty()) std::cout<<"empty image"<<std::endl; ... ::string, what if I need unicode support? 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 make the boost/asio library repeat a timer?

Here is the Code given on the Boost library documentation. #include <iostream> #include <boost/asio.hpp> #include ... seconds. Is it 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++ - What is the operator `|=`? How can I implement this in C#?

What is the C++ code below doing? More specifically, what is the operator |=? long liFaultFlags = 0; for ( ... would this be implemented in C#? 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++ - Virtual function calling a non-virtual function

I wrote the following piece of code to test my understanding of virtual inheritance. Apparently, I still don' ... guidelines. 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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