Recent questions tagged C++

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c++ - Built-in mod ('%') vs custom mod function: improve the performance of modulus operation

Recently I came to know that the mod('%') operator is very slow. So I made a function which will work just like a%b. ... ; return a - (b*tmp); } 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 with boost::unique_future

According to http://www.boost.org/doc/libs/1_55_0/doc/html/boost_asio/overview/cpp2011/futures.html, we can use boost:: ... (). How can I use? 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++ cli - Tracking reference in C++/CLI

Can someone please explain me the following code snippet? value struct ValueStruct { int x; }; void SetValueOne( ... be pointed by handler ;( 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 implement "Variadic Template" with pre-c++0x(VS2008)?

I'm using Visual Studio 2008, and I want to implement string formatting function without Variable Argument List. How to ... !"); return false; } 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 embed unicode string constants in a source file?

I'm writing some unit tests which are going to verify our handling of various resources that use other character ... solution to this problem? 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++ - Given a regular expression, how would I generate all strings that match it?

I'm using a simple language of only (), |, spaces, and alpha characters. Given a regular expression ... contains a substring which matches. 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 are "api-ms-win-*-*-lx-x-x.dll" umbrella libraries?

I keep running into DLLs with long file names, as such. Just two for example: "api-ms-win-appmodel-runtime-l1-1 ... -runtime-l1-1-1.dll"); 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++ - Parallel prefix sum - fastest Implementation

I want to implement the parallel prefix sum algorithm using C++. My program should take the input array x[1... ... could get much help from 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++ - Count number of matches

How do I count the number of matches using C++11's std::regex? std::regex re("[^\s]+"); std::cout << ... () << std::endl; Expected output: 7 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 std::forward receive the correct argument?

Consider: void g(int&); void g(int&&); template<class T> void f(T&& x) { g(std::forward<T>(x)); ... (std::remove_reference_t<T>& t) 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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c++ - Creating vignette filter in opencv?

How we can make vignette filter in opencv? Do we need to implement any algorithm for it or only ... .srcopencvmodulescoresrcmatmul.cpp, line 711 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++ - On implementing std::swap in terms of move assignment and move constructor

Here is a possible definition of std::swap: template<class T> void swap(T& a, T& b) { T tmp(std::move(a) ... , v). What is the explanation 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++ - MFC resources / links

I am about to reenter the MFC world after years away for a new job. What resources to people recommend for ... or blogs that people recommend? 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++ - Fast pseudo random number generator for procedural content

I am looking for a pseudo random number generator which would be specialized to work fast when it is given a ... in real time during rendering. 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++ - Use COM Object from DLL without register

Is it possible to use COM Object from DLL without register in C++ not managed 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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c++ - Will two relaxed writes to the same location in different threads always be seen in the same order by other threads?

On the x86 architecture, stores to the same memory location have a total order, e.g., see this video ... 's by std::memory_order_relaxed? 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++ - Visual Studio 2013 msvcr120 to msvcr100

Is it possible to change the restrib file to msvcr100 so other computers can run the program without having ... a older Visualstudio 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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602 views

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c++ - How to detect when a boost tcp socket disconnects

Suppose I have a socket: std::shared_ptr<tcp::socket> socket( new tcp::socket(acceptor.get_io_service()) ); ... .erase(socket); // pseudocode 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++ - construction helper make_XYZ allowing RVO and type deduction even if XZY has noncopy constraint

UPDATE1: C++17 added type deduction for constructors - which does not imply that the free function is an inferior solution ... i << std::endl; } See Question&Answers more detail:os...

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

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397 views

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c++ - boost::shared_ptr::shared_ptr(const boost::shared_ptr&)' is implicitly declared as deleted

#include <iostream> #include <boost/shared_ptr.hpp> #include <boost/make_shared.hpp> using namespace std; struct Node ... fix the problem." 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++ - Best way to get ints from a string with whitespace?

I know this is simple, I just can't recall the best way to do this. I have an input like " 5 15 " ... the correct code. 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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c++ - new c++11 for loop causes: "error: ‘begin’ was not declared in this scope"

I'm trying to learn c++, so I wrote a short program that uses the new c++11 for loop, which makes the ... :99:5: note: std::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++ - True random numbers with C++11 and RDRAND

I have seen that Intel seems to have included a new assembly function to get real random numbers obtained from ... when I compile a program? 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++ - Good hash function for a 2d index

I have a struct called Point. Point is pretty simple: struct Point { Row row; Column column; // some other code for ... can use, or is this 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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463 views

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c++ - How do I control the text input panel programmatically (TabTip.exe) in Windows Vista/7

I'm adapting an application for touch screen interface and we want to use the tablet text input panel included ... all are greatly appreciated. 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++ - virtual function const vs virtual function non-const

class Base { public: virtual void func() const { cout<<"This is constant base "<<endl; } }; class Derived : ... the Base func() is const right ? See Question&Answers more detail:os...

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

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300 views

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c++ - WideCharToMultiByte() vs. wcstombs()

What is the difference between WideCharToMultiByte() and wcstombs() When to use which one? See Question&Answers more detail:os...

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

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269 views

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c++ - How can I monitor what's being put into the standard out buffer and break when a specific string is deposited in the pipe?

In Linux, with C/C++ code, using gdb, how can you add a gdb breakpoint to scan the incoming strings in ... Perhaps a routine in libstdc++ ? See Question&Answers more detail:os...

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

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