Recent questions tagged C++

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(*) As far as I know the Standard allows an implementation to modify the operand of the delete operator, however ... would make reading ptr UB? 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++ - compiler can't find "aligned_alloc" function

Trying to get a portable function to allocate on heap with aligned feature. Found "aligned_alloc", which I think ... .h> #include <cstdlib> 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++ - Uninteresting mock function call bla() && Expected: to be called at least once bla()?

I've written a small test with a mocked class. When I run it, first I get the warning that an ... never called - unsatisfied and active 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++ - Q_ASSERT release build semantics

I can't find a clear statement on the semantics of Q_ASSERT under release builds. If there is no assertion ... that the statement is executed? 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++ - Will using new (std::nothrow) mask exceptions thrown from a constructor?

Assume the following code: Foo* p = new (std::nothrow) Foo(); 'p' will equal 0 if we are out of ... constructor make it out of the function? 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++ - Forward declare a constexpr variable template

I tried to forward-declare a constexpr variable template like this: template<typename> constexpr std::size_t ... makes the compilers disagree. See Question&Answers more detail:os...

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

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696 views

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c++ - Thread safe vector

Let me start by saying that I have read most SO and other topics on the subject. The way I understand things, ... . Many thanks in advance :-) 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 whether the iterator hit the end without container?

For example, how to implement the following function without any other information? bool isEnd(set<int> :: iterator itr); I ... == s.end(); } 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++ - Move constructor seemingly not executed

This is my first experiment with C++0x rvalue references and something strange seems to be going on. In the ... instance of 'int' Abort trap 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++ - --enable-pic equivalent in Visual Studio

What setting in Visual Studio C++ project, would be equivalent to *nix --enable-pic switch, i.e. ./configure --enable-pic See Question&Answers more detail:os...

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

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433 views

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c++ - How to simplify a fraction

I want to simplify a fraction in my application. The fraction is like, x/y where x and y are integers. I want ... to do it. Thanks in advance. See Question&Answers more detail:os...

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

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385 views

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c++ - Cython: templates in python class wrappers

Question Is there a way to create a Python wrapper for Cython-wrapped C++ class with templates? (i.e. do ... that's possible in any way. See Question&Answers more detail:os...

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

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641 views

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c++ - What is the correct way of providing header-filter for clang-tidy in Cmake?

I have projects that sets Clang-tidy configuration as following set(CMAKE_CXX_CLANG_TIDY "clang-tidy;-checks=google-*, ... . am I correct? See Question&Answers more detail:os...

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

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282 views

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c++ - Does C++17 forbid copy elision in a case where C++14 allowed it?

Consider the following: struct X { X() {} X(X&&) { puts("move"); } }; X x = X(); In C++14, the move ... to elide it, I don't know where it is. See Question&Answers more detail:os...

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

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342 views

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c++ - How do template aliases affect template parameter deduction?

In C++03, template parameter deduction does not occur in some contexts. For example: template <typename T> ... status of whatever they alias? See Question&Answers more detail:os...

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

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510 views

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c++ - Class names that start with C

The MFC has all class names that start with C. For example, CFile and CGdiObject. Has anyone seen it used ... or was it some other project? See Question&Answers more detail:os...

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

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430 views

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c++ - How to get string with pattern from std::regex in VC++ 2010

Can I get the string with regular expression from std::regex? Or should I save it somewhere else if I want to use ... see what's in std::regex. See Question&Answers more detail:os...

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

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451 views

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c++ - How do I use the C preprocessor to make a substitution with an environment variable

In the code below, I would like the value of THE_VERSION_STRING to be taken from the value of the environment ... {ENV['MY_VERSION']}""" See Question&Answers more detail:os...

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

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470 views

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c++ - itoa function problem

I'm working on Eclipse inside Ubuntu environment on my C++ project. I use the itoa function (which works ... iostream> which doesn't help. See Question&Answers more detail:os...

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

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479 views

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c++ - erase() after performing remove_if()

I've created a function to run through a vector of strings and remove any strings of length 3 or less. This is ... system("pause"); 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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459 views

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c++ - Is there any point in declaring a deleted function as noexcept?

Consider these two possible definitions for a class: Exhibit A: struct A { A() = delete; }; Exhibit A′ ... a deleted function as noexcept? See Question&Answers more detail:os...

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

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374 views

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c++ - Passing a pointer of inaccessible private base type to the derived class method

This code example would describe the language feature I find non-intuitive. class A { public: A() {} ... with other templates. 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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953 views

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c++ - sem_open() error: "undefined reference to sem_open()" on linux (Ubuntu 10.10)

So I am getting the error: "undefined reference to sem_open()" even though I have include the semaphore.h header. The ... O_RDWR,0); 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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463 views

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c++ - How can I work around warning C4505 in third party libraries?

I've got a project that uses Crypto++ for a few hashing functions. Recently, I decided to clean things up a bit ... if I can avoid doing so. See Question&Answers more detail:os...

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

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362 views

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c++ - Is random_shuffle threadsafe? and using rand_r if it is not

Is std::random_shuffle threadsafe? I presume not since the regular rand() is not threadsafe. If that is the ... still unclear to me. 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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402 views

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c++ cli - Is C++ CLI a superset of C++?

Would a C++ CLI compiler be able to compile some large sets of C++ classes without modifications? Is C++ CLI a superset of 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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412 views

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c++ - setWindowFlags(Qt::WindowStaysOnTopHint) hides Qt Window

I want to make my Qt Window stay on top. When setWindowFlags(Qt::WindowStaysOnTopHint) is executed, the window becomes ... did I do wrong 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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407 views

1 answer

c++ - Events with QGraphicsItemGroup

In my application I want to use QGraphicsItemGroup for grouping items into one item. I played with it a little and ... How can I achieve 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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