Recent questions tagged c++

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c++ - Defining static const variables of a template class

I have a vector class which has some static const variables like ZERO. Now since vector is often implemented as ... this is non-standard code. 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 can't I add a QGridLayout to a QMainWindow?

I've created a QMainWindow class. I coded a QGridLayout for the main layout, but whenever I add setLayout(grid); ... using Linux (ubuntu 12.10). 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 a function pointer to function name?

I now have an array of functions that have the same functionality, func_pointer_t func_array[] = {func_1, func_2, ... is pointing to func_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++ - Partial template specialization with non-type parameters: GCC vs MSVS

Consider this simple template specialization: template<typename T, size_t I> struct S {}; template<typename T ... of the partial specialization 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++ - QMYSQL driver loading error

I tried to get MySQL running with Qt today and I am running into an error when I load the QMYSQL drivers ... would appreciate any help. Thanks! 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 map BYTE array as FILE * on Windows

I found old, huge open source code which performs some computations on binary data stored in file on disk, output ... using C/C++ mechanisms? 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++ - Under what circumstances can an extern variable be used in definition?

I am very very sorry. I didn't know my incomplete code attachment would create such a mess. I am very ... make things clear like aschepler said? 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++ - More than 2 variables in std::pair

pair looks like this: std::vector<std::pair<uint64 /*id*/, std::string /*message*/> And if I want 3 variables in vector? Can I use pair or what? 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++ - error with define macro definition

when i am using #define function,I observe something bizarre. In the below code if I gave i value as '10' from input ... +i)<<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++ - rand() produces the same result on each function call (with srand(time(0))

I have a member function of a class that is supposed to generate a random number in a range. To do so, I am ... call it. What am i doing wrong? 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++ - Redirect FROM stderr to another file descriptor

My program calls library functions which print to stderr. I want to intervene so that all write calls to file ... if it doesn't exist.) 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++ - QMYSQL driver not loaded on Windows

I am trying to implement a database system in my Qt application. For this purpose, I am trying to use MySQL ( ... section of the message-box). 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 extern "C" required also for linking global variables used in Cpp file to the one defined in a cfile?

Is extern "C" required also for linking global variables used in Cpp file to the one defined in a c file? ... changes the name of 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++ - Is it possible to hook the creation of windows globally so I can control where the windows are placed on the screen?

I can inject a hook into running processes to catch when they create, destroy, max/min. But I haven't come ... the best way to accomplish 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++ - Boost spirit compile issue

Hi I am very new to boost spirit library. Can you please let me know why below code is not compile? When I ... is the boost::spirit::qi::grammar 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++ - Are the special member functions always declared?

In §12 of the standard every special member function has a set of rules which cause it to be implicitly declared ... be "defined" as defaulted? 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::dec still outputting memory address to hex?

I have: std::cout << "Start = " << std::dec << (&myObject) << std::endl; to output an address in ... and then std::dec the variable 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++ - Make Error: Undefined symbols for architecture x86_64

I'm a pretty novice programmer (as in I only code when I need to), but I mostly work in television. ... would be greatly appreciated. Thanks! 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++ - Writing a plugin system?

After many hours of research I have turned up nothing, so I turn to you good folks in hopes of a ... least theories on the typical design? 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++ - AVX2 column population count algorithm over each bit-column separately

For a project I'm working on I need to count the number of set bits per column in ripped PDF image data. ... what data structures I'm using. See Question&Answers more detail:os...

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

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679 views

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c++ - Union vs. static_cast(void*)

I'm writing code and until now I was using structures like this: struct s{ enum Types { zero = 0, one, two ... these days isn't a big concern). 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 most efficient way to remove first N bytes from a file on Windows?

Say, I have a file of an arbitrary length S and I need to remove first of its N bytes (where N is much ... that this method causes on disk?) 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++ - flicker free tab control with WS_EX_COMPOSITED

I have a VS2008 C++ application for Windows XP SP3 developed using WTL 8.1. My application contains a ... through WTL::CDoubleBufferImpl<>. 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++ - Convert Hex String to Hex Value

I have a large hex string abcdef... and I want to convert it to 0xab 0xcd 0xef Are there any functions that ... my array with the hex string. 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++ - Use CString in console app when using VS Express

I have a problem when trying to use CString. I have a console application written using VS2010Express. I have a ... you, and happy Easter ! 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++11 style SFINAE and function visibility on template instantiation

I'm not sure if this has anything to do with sfinae, or just something thats relevant for any templated function. I am ... f from S 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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559 views

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c++ pass array to function question

How is it possible to pass an array parameter to a function, and calculate the size of the array parameter? ... a shot to vectors. Thanks See Question&Answers more detail:os...

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

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784 views

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c++ - How to get process description?

I want to get the description of a process (the description that is seen in task manager) in Windows using 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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