Recent questions tagged C++

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c++ - Segfaults in malloc() and malloc_consolidate()

My application segfaults sometimes and mainly in malloc() and malloc_consolidate() when I look at the backtrace in ... for each process ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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431 views

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c++ - library is linked but reference is undefined

I'm trying to compile an openCL program on Ubuntu with an NVIDIA card that worked once before, #include ... Am I missing something. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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415 views

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c++ - What does `auto && e` do in range-based for-loops?

Assuming my current rule when programming with range-based loops says Use for(auto const &e :...) or for(auto ... needed do not use references. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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343 views

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c++ - How do I "normalize" a pathname using boost::filesystem?

We are using boost::filesystem in our application. I have a 'full' path that is constructed by concatenating several ... the path as a string? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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466 views

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c++ - Disambiguate overloaded member function pointer being passed as template parameter

I am attempting to recreate the Observer pattern where I can perfectly forward parameters to a given member function ... deduction to work here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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337 views

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c++ - Do C++11 regular expressions work with UTF-8 strings?

If I want to use C++11's regular expressions with unicode strings, will they work with char* as UTF-8 or ... convert them to a wchar_t* string? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - How should I brace-initialize an std::array of std::pairs?

std::array<std::pair<int, int>, 2> ids = { { 0, 1 }, { 1, 2 } }; VS2013 error: error C2440 ... resolution was ambiguous` What am I doing wrong? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - error while loading shared libraries: libboost_system.so.1.45.0: cannot open shared object file: No such file or directory

I am building a C++ executable on Linux. The executable links into some boost libraries. This is the output ... on today. Can anyone explain? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c++ - When is std::chrono epoch?

std::chrono::time_point::time_since_epoch() returns a duration, referred to some time_point in the past. When is such ... to 1 January 1970 UTC? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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293 views

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c++ - copy vs std::move for ints

What's difference between default copy and std::move in that example? After move the object ... : 0x7fffffffe094 0x7fffffffe098 0x7fffffffe09c See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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253 views

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c++ - Undefined Reference to

When I compile my code for a linked list, I get a bunch of undefined reference errors. The code is below. I have ... (2); node3.setElement(3); } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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450 views

1 answer

c++ - Segfaults in malloc() and malloc_consolidate()

My application segfaults sometimes and mainly in malloc() and malloc_consolidate() when I look at the backtrace in ... for each process ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

283 views

1 answer

c++ - library is linked but reference is undefined

I'm trying to compile an openCL program on Ubuntu with an NVIDIA card that worked once before, #include ... Am I missing something. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

541 views

1 answer

c++ - What does `auto && e` do in range-based for-loops?

Assuming my current rule when programming with range-based loops says Use for(auto const &e :...) or for(auto ... needed do not use references. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

384 views

1 answer

c++ - How do I "normalize" a pathname using boost::filesystem?

We are using boost::filesystem in our application. I have a 'full' path that is constructed by concatenating several ... the path as a string? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

441 views

1 answer

c++ - Disambiguate overloaded member function pointer being passed as template parameter

I am attempting to recreate the Observer pattern where I can perfectly forward parameters to a given member function ... deduction to work here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

256 views

1 answer

c++ - Weird MSC 8.0 error: "The value of ESP was not properly saved across a function call..."

We recently attempted to break apart some of our Visual Studio projects into libraries, and everything seemed to ... or a dangerous hack? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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411 views

1 answer

c++ - Why was std::strstream deprecated?

I recently discovered that std::strstream has been deprecated in favor of std::stringstream. It's been a while ... absent from std::strstream? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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549 views

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c++ - Declare a reference and initialize later?

I have a reference to some class MyObject, but the exact object depends on a condition. I want to do something ... do to achieve my goal here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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496 views

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c++ - Fatal error: "No Target Architecture" in Visual Studio

When I try to compile my c++ project using Visual Studio 2010 in either Win32 or x64 mode I get the following error ... 't know how to fix it. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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396 views

1 answer

c++ - Lambda capture and parameter with same name - who shadows the other? (clang vs gcc)

auto foo = "You're using g++!"; auto compiler_detector = [foo](auto foo) { std::puts(foo); }; ... the C++ Standard here? wandbox example See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

356 views

1 answer

c++ - AVX2: Computing dot product of 512 float arrays

I will preface this by saying that I am a complete beginner at SIMD intrinsics. Essentially, I have a CPU ... would also value this information. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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582 views

1 answer

c++ - Win32: How to hide 3rd party windows in taskbar by hWnd

I have to hide popup windows in third party library. I have implemented windows hook stuff with SetWindowsHookEx and ... windows in task bar? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

295 views

1 answer

c++ - OpenMP: What is the benefit of nesting parallelizations?

From what I understand, #pragma omp parallel and its variations basically execute the following block in a ... loop be executed sequentially? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

301 views

1 answer

c++ - AVX2: Computing dot product of 512 float arrays

I will preface this by saying that I am a complete beginner at SIMD intrinsics. Essentially, I have a CPU ... would also value this information. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

402 views

1 answer

c++ - Win32: How to hide 3rd party windows in taskbar by hWnd

I have to hide popup windows in third party library. I have implemented windows hook stuff with SetWindowsHookEx and ... windows in task bar? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

327 views

1 answer

c++ - OpenMP: What is the benefit of nesting parallelizations?

From what I understand, #pragma omp parallel and its variations basically execute the following block in a ... loop be executed sequentially? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

319 views

1 answer

c++ - Do static members of a class occupy memory if no object of that class is created?

Say I have a class and I have a static member in it, but I don't create any objects of that type. Will the ... point of putting it in a class? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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