Recent questions tagged C++

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c++ - Hide a file or directory using the Windows API from C

I want to modify a C program to make some of the files it creates hidden in Windows. What Windows or ( ... will set the hidden file attribute? 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++ - OpenGL version to start with (as of late 2014)

I know nothing about OpenGL, but it turns out it might be needed for something that I'm working on (figured ... started and figure my way out. 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++ - Keyword 'template' confuses MSVC

One of those "which compiler is right" questions about templates. Consider following: template<typename T> class ... is a known issue). 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++ - Returning std::move(f) in std::for_each

I'm writing an implementation of standard c++ library for study. The C++11 standard says that for_each returns ... I return move(f) explicitly? 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++14: can you call new in a constexpr?

When C++14 lifted restrictions on constexpr it seemed to include the following (copied from Wikipedia): Expressions ... it would be allowed. 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 this class specialization using a concept accepted?

The following code attempts to partially specialize a class using a concept and add a method to the ... guarantee of correctness.) 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 an ASCII std::string to hex

is there an easy way to convert an ASCII std::string to HEX? I don't want to convert it to a number, I only ... << " "; } Thanks, /mspoerr 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++ - no viable conversion from 'value_type' (aka 'char') to 'string' (aka 'basic_string<char, char_traits<char>, allocator<char> >')

string convert(string name) { string code = name[0]; ... } I get "no viable conversion from 'value_type' ( ... it works. Can anyone explain why? 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++ - Perform a copy of Document object of rapidjson

I'm making a class and I want to return my class inside a method. My class has a rapidjson::Document object ... a copy of the Document element? 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 check if path is valid in boost::filesystem?

I am setting a boost::filesystem::path from an edit field. I notice that the constructor is happy to ... object represents a valid filename? 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 C2106: '=' : left operand must be l-value

Looking at the other questions regarding error C2106, I am still lost as to what the issue is with my code. ... ; Any help is 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++ - Does valarray have contiguous memory alignment?

Does valarray have contiguous memory alignment? I want to pass a valarray to a function (from IPPS), which ... alignment is contiguous. 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++ - Obtain iterator from pointer or reference

I would like to know if it is possible to obtain an iterator to an object inside a container (e.g. std::vector<. ... .g. std::list or std::deque 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++ - Canonical way to define forward output iterator

How does one define forward-output-iterators in C++11 in a canonical way? According to the standard a ... is there a better 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++ - perf report shows this function "__memset_avx2_unaligned_erms" has overhead. does this mean memory is unaligned?

I am trying to profile my C++ code using perf tool. Implementation contains code with SSE/AVX/AVX2 ... the sample report as picture. 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++ - Qt convert unicode entities

In QT 5.4 and C++ I try to decode a string that has unicode entities. I have this QString: QString string = ... way to convert it by using Qt? 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 while (std::cin >> value) work?

In an example given in C++ Primer, #include <iostream> using namespace std; int main() { int sum = ... understand my primary question. 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 do capture lists of lambdas actually work in C++11?

I know that capture lists make variables available inside a lambda function body like so: int pos(0); ... addresses or captured values stored? 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++ - Auto vectorization not working

I'm trying to get my code to auto vectorize, but it isn't working. int _tmain(int argc, _TCHAR* argv[]) ... not, again with error code 1305. 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++ - Get each nth element of iterator range

Is there any standard implementation (meaning stdlib or boost) of an iterator that wraps another iterator and ... non-random access iterators 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 draw a rainbow in Freeglut?

I'm trying to draw a rainbow-coloured plot legend in openGL. Here is what I've got so far: glBegin(GL_QUADS); for ... // bottom-left } glEnd(); 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++ - Forwarding template taking precedence over overload

I thought that a non-template would always take precedence over a template, if the arguments match up just ... necessarily means anything!). 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++ - sscanf() and locales. How does one really parse things like "3.14"?

Let's say I have to read a file, containing a bunch of floating-point numbers. The numbers can be like 1e ... do in such situations? Cheers! 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++ - win32 select all on edit ctrl (textbox)

I am creating my textbox with these options. I can Copy / Cut / Paste / Undo, but when I hit Select All it ... h, parentWnd, NULL, NULL, NULL); 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++ - Alias of a template. Who's right?

The following code seems reasonable, but doesn't work on two major compilers #include <type_traits> template< ... this code standard conformant? 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++ - Prevent the Boost Spirit Symbol parser from accepting a keyword too early

How can I prevent the Boost Spirit Symbol parser from accepting a keyword (symbol) when starts with a valid keyword ( ... , space); 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++ - VS2010 - Structure change in CryptoAPI - v7.0A Vs v6.0A - WinCrypt.h

In C:Program FilesMicrosoft SDKsWindowsv7.0AIncludeWinCrypt.h, the definition for CERT_CHAIN_ENGINE_CONFIG is typedef struct ... _MBCS 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++ - Initialisation of static class member. Why constexpr?

when I want to have a static pointer as a member of a class I need constexprfor the initialisation with nullptr. ... to exist at compile 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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