Recent questions tagged C++

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c++ - Function crashes when using _mm_load_pd

I have the following function: template <typename T> void SSE_vectormult(T * A, T * B, int size) { __m128d a ... how can I determine my error? 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-log linker error

i've downloaded and builded Boost 1.55 from source. I'm trying to use Boost-log. In basic case (http://boost- ... I'm working on windows 7 x64. 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++ - Semantic actions runs multiple times in boost::spirit parsing

I am trying to create AST with semantic rules while parsing with boost::spirit. AST must be built only for ... times that causes mem leaks. 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 the window that contains the QtVirtualKeyboard

I'm using qt widgets on embedded device and have problem with virtual keyboard. Keyboard is shown as fullscreen and ... the window isn't 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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c++ - Stop X3 symbols from matching substrings

How does one prevent X3 symbol parsers from matching partial tokens? In the example below, I want to match "foo", but ... "Parse failed"; } } } 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 const_cast is not modifying the value in caller function?

For below snippet, #include <iostream> using namespace std; void fun(const int *p) { int *q = ... of undefined behavior with const_cast ? 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 default three-way operator (spaceship <=>) generates equality operator (==) and user define three-way operator not?

Consider this code: #include <iostream> #include <compare> class A { public: int i = {}; std::strong_ordering ... that I am working right now. 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 Widgets and derived classes

I am wondering if there is a way to do this. I create a Qt Application (using Creator 3.6.1, Qt 5.6. ... DerivedView { QGraphicsView * gv; ... 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 the kth largest element in the union of two sorted arrays?

I need to find the k largest element in two sorted arrays, but with a twist. This algorithm assumes k<=max(m,n) ... << std::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++ - How to exit sleep() when an interrupt arrives?

I'm looking for a way to exit sleep when an user interrupt arrives. It's important to exit sleep rather ... way which doesn't involve polling. 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++ - "Multiple definition" when using (mock) header files for templates

I am aware that definitions of C++ templated functions have to be placed in header files. However, for reasons ... still looking for a 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++ - Howto detect that a network cable has been unplugged in a TCP connection?

I have a C++ networking application that accepts TCP connections from clients and then waits on the socket until ... on Windows and on Linux. 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++ - CertCreateCertificateContext returns ASN1 bad tag value met

I'm loading a .p7b certificate file into memory and then calling CertCreateCertificateContext on it, but it fails ... I doing wrong? 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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210 views

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c++ - Why is calling non virtual member function on deleted pointer an undefined behavior?

As, the title says: Why is calling non virtual member function on deleted pointer an undefined behavior? Note ... occurs. Can someone confirm? 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++ - Getting a bool reference from std::vector<bool>

I know it's a bad habit, but I'd like to know some workaround or hack for this problem. I have a ... std::Vector? Or any different 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++ - Does STLR(B) provide sequential consistency on ARM64?

For stores performed on an object of an atomic data type (say, std::atomic<uint8_t>), GCC generates: MOV ... https://godbolt.org/z/hajMKnd53 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++ - 2-Dimensional array deallocation

As an intro, I'm using C++ in Visual Studio 2010, compiling for x64. I have a program that's using 2- ... delete [] results; delete [] data; 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 pointer conversions to store/cast values: Am I breaking the strict aliasing rule?

The question relates to this post. Some authoritative users stated that the following code breaks strict aliasing ... does not issue warnings. 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++ - Linker error when using static members

I'm using Qt 4.7 and Cmake 2.8.3 with g++ 4.2.1 on Mac OS X. I'm getting a bizarre linker ... could be wrong/had a similar problem with 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++ - Header guards do not seem to work?

I have declared some constant variable in seperate header (i.e., constant.h). I include the constant.h in my ... application has been run"); } 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 correctly find out the return type of a lambda

basically how to make following code compile? I know it failed because compiler was trying to evaluate something like ([]( ... ){}); // failed } See Question&Answers more detail:os...

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

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165 views

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c++ - Is there any way to get some information at least for catch(...)?

Is there any way to get at least some information inside of here? ... catch(...) { std::cerr << " ... at least could get a crash report? 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++ - Resume reading from iostream::cin after Ctrl+Z (EOF)? ("ignore" doesn't work)

Why does the outer loop in the following program terminate when we provide ctrl+z for the inner loop only? #include< ... ; cin.ignore(); } } 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 do internal compiler error messages mean, and what can I do?

I was trying to compile my C++ program, which uses MPICH and NAG C library (I use NAG to generate random ... the line number in my 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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387 views

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c++ - Boost serialization bitwise serializability

I expect from is_bitwise_serializable trait to serialize class like following (without serialize function): ... bitwise_serializable class? See Question&Answers more detail:os...

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

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498 views

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c++ - std::pow with integer parameters, comparing to an integer type

According to http://en.cppreference.com/w/cpp/numeric/math/pow , when std::pow is used with integer parameters, ... use a std::round everywhere. See Question&Answers more detail:os...

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

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251 views

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c++ - Using a regex_iterator on an istream

I want to be able to solve problems like this: Getting std :: ifstream to handle LF, CR, and CRLF? where an ... do I have to write it myself? See Question&Answers more detail:os...

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

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734 views

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c++ - How to include the QtCharts library in Qt Creator 4.2.0 (Community)

I tried to include the QtCharts but i have an error when i include the library, this is the error: Project ERROR ... 't work. Please help me. See Question&Answers more detail:os...

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

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