Recent questions tagged C++

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c++ - Convert Mat to vector <float> and Vector<float> to mat in opencv

i want to Convert Mat to vector and Vector to mat in opencv . my code : void mat_to_vector(Mat in,vector< ... slow. are there faster solutions? 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 prefetch infrequently used code?

I want to prefetch some code into the instruction cache. The code path is used infrequently but I need it to ... so even asm would do. 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 statically compile Qt using MinGW compiler and SSL support

How to statically compile Qt with OpenSSL support on Windows (with MinGW compiler) The desired 'outcome' of this ... that could benefit all. 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++ - Render Buffer on Screen in Windows

I'm searching for a way rendering a char buffer onto the content-area of a window. This is just pseudo but ... a way to do something similar? 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++ - const overloaded operator[] function and its invocation

I define two versions of overloaded operator[] function in a class array. ptr is a pointer to first element ... which function is called 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++ - Breakpoint handling in another process

Following advices given in Read eax register , I wrote a simple debugger using winapi. My objective is to read the ... ; } Thanks for 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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c++ - Is std::ifstream thread-safe & lock-free?

I intend to perform opening for reading a single file from many threads using std::ifstream. My concern is if ... ::ifstream 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++ - Can I use decltype (or something similar) for explicit template instantiation without signature duplication?

I want to instantiate template<typename T> void foo( T& t, SomeType some_parameter, AnotherType another_parameter, EtcType ... 't work. 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++ - Iterator for custom container with derived classes

I've a custom container which is implemented in two different ways, but with a single interface. some thing like ... base class. Any Ideas ? 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 obtain list of thread handles from a win32 process?

Is it possible to get a list of thread handles at any given time for the current process on win32 (in 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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c++ - Sum the components of a tuple up by using std::get, std::tuple_size, std::tuple_element

I've got a custom class that has a tuple-like interface. Because I want my code to be as generic as possible, I ... operator. I am using c++1z. 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 lexer token attributes in grammar rules with Lex and Qi from Boost.Spirit

Let's consider following code: #include <boost/phoenix.hpp> #include <boost/spirit/include/lex_lexertl.hpp> ... affect questions asked 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++ - How do I invoke the shell "file copy dialog" to report the progress of a copy in Win32?

How can I copy files by invoking windows "copy files" dialog to do it? SHFileOperation seems like a option, but ... as the Windows copy dialog? 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 do I call a friend template function defined inside a class?

I got this example from my book, but I have no idea how to actually call the ticket function. This is the ... (s) not accessible" error message. 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++ - OpenCV 2.3 and Visual Studio 2010

I am having so much trouble installing openCV 2.3 with visual studio 2010. Crash after crash, installation after ... > line 2482 int 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++ - Dynamic mapping of enum value (int) to type

It appeared that this problem is quite common in our job. We we are sending an int or enum value through the ... problem in every day coding... 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++ - Problem accessing base member in derived constructor

Given the following classes: class Foo { struct BarBC { protected: BarBC(uint32_t aKey) : mKey(aKey) mOtherKey(0 ... 0 in the BarBC constructor? 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's the difference between a compiler's `-O0` option and `-Og` option?

When I want to do debugging of C or C++ programs, I've been taught to use -O0 to turn optimization OFF, ... : No symbol "i" in current context 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++ - Memory model spec in pthreads

Are there any guarantees on when a memory write in one thread becomes visible in other threads using pthreads? ... threading library be used? 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 Drive Letter for the DevicePath

I am using Win32 API. Really i do not understand how to get the drive letter for DevicePath of a USB stick ... DevicePath ) Thanks for any 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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494 views

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c++ - Is the whole object freed with a non-virtual destructor and a Base class pointer?

If a Base class does not have a virtual destructor (in order to avoid the vtable entry for instance) and the ... Derived freed? 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++ - Why can't a const method return a non-const reference?

Why won't the method getRanks() below compile, and how can I fix it gracefully? All I want do is define a ... call it from other const methods. 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::io_service How to guarantee handler execution sequence

I have a thread pool with boost::io_service on top. I use it for different CPU-bound tasks in whole ... task after executing of current. 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 GetFileVersionInfo on kernel32.dll in Windows 10 return version 6.2?

I am trying to retrieve kernel32.dll version in order to perform a Windows version check. Yet, for some reason, ... (same as in SysWow64): 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++ - Usage of this next_combination code

Currently I am trying to generate combinations from a vector that contains some integers. For now I want it to print ... std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = __g...

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

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675 views

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c++ - Detect if mouse button is down

I am new to c++ and I am trying to activate a line of code only when the left mouse button is held down. ... P, LPSTR CMD, int nShowCmd ); See Question&Answers more detail:os...

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

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181 views

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c++ - Why std::sort doesn't accept Compare classes declared within a function

I was at work, writing the Comparators in a function (to move later, when I decided where was best), and ... > >, main()::ComparitorInner&)' 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 does auto deduce type?

I have some cases of use of auto: auto s = expr; //s is always lvalue auto & s = expr; //s is always ... forwarded Are they true? If not, 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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