Recent questions tagged C++

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c++ - Extract high resolution icon or thumbnail for file

I'm trying to get a high resolution icon or thumbnail in Windows given a full path to that file. Doesn't ... anything better than 32x32 ... 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 we need to set rvalue reference to null in move constructor?

//code from https://skillsmatter.com/skillscasts/2188-move-semanticsperfect-forwarding-and-rvalue-references class Widget { ... .pds = nullptr; 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++ - A way to load DLL from central repository

We have lot of products and there are some common DLLs across each product's application. Right now we copy ... our private directory ] -Kartlee 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 can I simulate a button click given the handle to the button's window?

I want to simulate a click on a button located in a dialog box. I have the handle to that window. This is an ... as it doesn't suit my needs. 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 does the "::" mean in "::tolower"?

I've seen code like this: std::string str = "wHatEver"; std::transform(str.begin(), str.end(), str.begin( ... not works, but ::tolower works OK 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++ - Loading DLL from a location in memory

As the question says, I want to load a DLL from a location in memory instead of a file, similarly to ... storing the decrypted version on disk. 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 C++11 require allocators to be default constructible, libstdc++ and libc++ disagree?

Using a slightly modified version of Howard Hinnants's C++11 stack allocator which is documented here and ... Which implementation is 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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c++ - Avoiding compiler issues with abs()

When using the double variant of the std::abs() function without the std with g++ 4.6.1, no warning ... errors when used with other compilers? 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 way to set stdout to binary mode?

Is there way to set stdout to binary mode? In which mode is stdout without any operations, from my debugging issues ... when I'm doing it. 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 handle list in R to Rcpp

I have a list in R that x<-list(c(1,2,3), c(4,5), c(5,5), c(6)). I want to input the list to Rcpp and return ... c(4,5), c(5,5), c(6)) fx(x) See Question&Answers more detail:os...

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

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272 views

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c++ - how to convert the Certificate String into X509 structure.?

can any one tell me how to convert the string content into X509 structure . i am using openssl to read the ... how to convert this into X509. 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++ - Cannot load any more object with static TLS

I have an application that use dlopen() to load additional modules. The application and modules are built on ... work on almost same system. See Question&Answers more detail:os...

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

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309 views

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c++ - Cache lines, false sharing and alignment

I wrote the following short C++ program to reproduce the false sharing effect as described by Herb Sutter: Say, we ... 4.8.1 posix dwarf rev3) See Question&Answers more detail:os...

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

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883 views

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c++ - Expression contains unexpanded parameter packs

Somehow I don't get how variadic template parameter packs are expanded. What's wrong with thie following code? #include < ... ' and 'args'. 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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616 views

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c++ - Why doesn't #include <Python.h> work?

I'm trying to run Python modules in C++ using "#include <Python.h>", however, after setting the "Additional ... of Python. 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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357 views

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c++ - Safe and effective way to put a mutex on a container entry

C++'s std::mutex does not have a move constructor. There is a good reason for that. Basically, move ... for doing these kinds of things. See Question&Answers more detail:os...

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

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217 views

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c++ - Python embedded in CPP: how to get data back to CPP

While working on a C++ project, I was looking for a third party library for something that is not my core business ... i cannot get it to work. See Question&Answers more detail:os...

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

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215 views

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c++ - Member not zeroed, a clang++ bug?

Consider the following code: class A { public: int i; A() {} }; class B { public: A a; int i; } ... . The second bullet of each applies 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++ - CMake Error: "add_subdirectory not given a binary directory"

I am trying to integrate Google Test into the subproject of bigger project and I cannot find the solution ... --CMakeLists.txt CMakeLists.txt 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++ - countNonZero function gives an assertion error in openCV

I tried to get horizontal projection using countNonZero() function as below. Mat src = imread(INPUT_FILE, ... point out the mistake? See Question&Answers more detail:os...

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

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303 views

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c++ - static keyword in h file and internal linkage

Yet another static question. I have read the following: What are static variables? file scope and static floats ... cpp files is also welcomed. See Question&Answers more detail:os...

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

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215 views

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c++ - Precompiled Headers in Header Files

I ran into precompiled headers today for the first time..forever changing my life. I can't believe compiling my C ... between GCC and VC++. 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::asio io_service thread pool

What's the proper usage of settings up a thread pool for io_service? These 2 statements from the documentation are ... What's the correct 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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382 views

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c++ - How to prevent a Linux program from running more than once?

What is the best way to prevent a Linux program/daemon from being executed more than once at a given 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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241 views

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c++ - Does a default constructor always initialize all members?

I could swear I don't remember having seen this before, and I'm having trouble believing my eyes: Does an ... it not guaranteed to be zero? See Question&Answers more detail:os...

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

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373 views

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c++ - Enlightening Usage of C++11 decltype

I've just seen this really nice talk Rock Hard: C++ Evolving by Boris Jabes. In the section of the ... a more enlightening usage of decltype? See Question&Answers more detail:os...

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

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525 views

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c++ - What can explain std::cout not to display anything?

For whatever reason, std::cout does not display anything with my application. The description of my development ... why nothing is displayed ? See Question&Answers more detail:os...

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

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558 views

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c++ regex extract all substrings using regex_search()

I am new to c++ regex. I have a string "{1,2,3}" and I want to extract the numbers 1 2 3. I thought I should ... 1,2,3} size: 1 the 1th match: 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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