Recent questions tagged C++

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c++ - call of overloaded 'min(int&, int&)' is ambiguous

I got some problem on template.This code passed under vc6 but failed under g++. Is there anybody could tell me the reason? ... 值 2，总计时间： 623毫秒) 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++ - unresolved external symbol __mm256_setr_epi64x

I have written and debugged some AVX code with g++ and now I'm trying to get it to work with MSVC, but ... . Any help would be much 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 explicitly calling destructor result in Undefined Behavior here?

In my opinion, the following code (from some C++ question) should lead to UB, but the it seems it is not. Here ... not UB at all in this case? 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++ - Line interpolation in Qt?

I am trying to decrease the spacing of my brush strokes (on a QPixmap) by dividing the length of the line. If I ... pixmap, rect); update(); } 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 a class method call a global function with the same name?

The following code shows a function call another function. Both have the same name, but different signatures. ... terms of compiler errors). 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 prevent inheriting CPU affinity by child forked process?

I have a server process that forks many child processes. The server process has affinity to a CPU core, but I ... with respect to cpu affinity? 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++ - creating global variables causes linker error

I have an MFC application AVT_testapp, and in the header file (AVT_testappDlg.h) I am trying to create a ... the end of the relevant stuff 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 seekg() in text mode

While trying to read in a simple ANSI-encoded text file in text mode (Windows), I came across some strange ... . Why exactly is this happening? 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 design around the limitation that templated member functions can't be virtual

I'm running into a design issue where (in C++) I'd like a templated member function (of a non- ... of my design. Appreciate any suggestions 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++ - higher precision floating point using boost lib (higher then 16 digits)

I am running a simulation of physical experiments, so I need really high floating point precision (more than 16 ... it is incorrect. 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++ - Is there a limiltation of simultaneous filestreams?

I have a strategic question to the use of simultaneously opened fstreams. I have to write a program which ... computes several hours. 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++ - friend declaration not forward declaring

My understanding was that a friend declaration could also serve as a forward declaration for a class if the ... What am I misunderstanding? 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++ - In Qt Qml Controls, ApplicationWindow lacks the native-looking theme when run

Qml Controls comes with a nice native-like theme by default. When I run my program as qml files through the ... ; return app.exec(); } 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 does g++5 deduces object instead of initializer_list in auto type deduction

I recently came upon this code: struct Foo{}; int main() { Foo a; // clang++ deduces std::initializer_list // ... g++5 deduces the type as Foo? 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++ - Sizeof empty class

With the code: #include <iostream> class A {}; class B { char x; }; int main() { std::cerr << ... it rather than just know the answer. See Question&Answers more detail:os...

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

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191 views

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c++ - Why does writing to temporary stream fail?

Consider the following code: #include <sstream> #include <iostream> class Foo : public std::stringstream { public: ... as the first example? 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: cannot specify explicit initializer for array

I'm using Visual Studios 2013 and I keep getting this error yet I don't understand why. class CLI{ ... specify explicit initializer for arrays See Question&Answers more detail:os...

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

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273 views

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c++ - Discrepancy between istream's operator>> (double& val) between libc++ and libstdc++

With my recent upgrade to Mac OS X 10.9 the default standard C++ library changed from libstdc++ to libc++. ... -darwin13.0.0 Thread model: posix 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 make a not null-terminated c string?

i am wondering :char *cs = .....;what will happen to strlen() and printf("%s",cs) if cs point ... the string is actually nul terminated." 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++ - Condition variable deadlock

I have a problem with a deadlock in my code related to the use of condition variables. This is more of a ... to timed_lock? I would hate to. See Question&Answers more detail:os...

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

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223 views

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c++ - Local variable scope question

Why is the following code prints "xxY"? Shouldn't local variables live in the scope of whole function? Can I ... safe // mutex released 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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553 views

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c++ - How to check if socket is closed in Boost.Asio?

What is the easiest way to check if a socket was closed on the remote side of the connection? socket::is_open() ... at the point of the 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++ - Why do the objects created in a loop have the same address?

I do see some other questions that look like mine, but I still can't figure this out. Here's my code: ... ] also the address of the object? 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 get the index of a type in a variadic type pack?

For example template<typename T, typename... Ts> struct Index { enum {value = ???} }; and assume T is one ... double, int, double>::value is 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++ - How to grab video frames in Qt?

I am new to Qt, I only know the basics: create interfaces and connect slots. In a few words, my ... lot but not found anything conclusive. See Question&Answers more detail:os...

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

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515 views

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c++ - Why does lambda init-capture not work for unique_ptr?

I'm trying to use the C++14 init-capture feature to move a unique_ptr inside a lambda via capture. For some ... = delete; ^ 1 error generated. See Question&Answers more detail:os...

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

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372 views

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c++ - Why does rand() compile without including cstdlib or using namespace std?

According to the book I'm reading, rand() requires #include <cstdlib> in C++ However, I am able to compile the ... rand() << std::endl; } See Question&Answers more detail:os...

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

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172 views

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c++ - Is there a specific reason why a trailing-return-type is not a complete-class context of a class?

Note that a trailing-return-type is not mentioned in [class.mem]p6 A complete-class context of a class is a (6. ... not visible. [?Example: ... See Question&Answers more detail:os...

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

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