Recent questions tagged C++

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c++ - Why was std::pow(double, int) removed from C++11?

While looking into Efficient way to compute p^q (exponentiation), where q is an integer and reviewing the ... such an optimized overload? 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 do I pass multiple ints into a vector at once?

Currently when I have to use vector.push_back() multiple times. The code I'm currently using is std::vector ... multiple values into the vector? 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++ - std::lexical_cast - is there such a thing?

Does the C++ Standard Library define this function, or do I have to resort to Boost? I searched the web and ... thought I'd better ask 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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c++ - cc1plus: error: unrecognized command line option "-std=c++11" with g++

I'm trying to compile using g++ and either the -std=c++11 or c++0x flags. However, I get ... or FITNESS FOR A PARTICULAR PURPOSE. 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++ - Does an unused member variable take up memory?

Does initializing a member variable and not referencing/using it further take up RAM during runtime, or does the ... its members are used? 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++ - C++11 anonymous union with non-trivial members

I'm updating a struct of mine and I was wanting to add a std::string member to it. The original struct looks ... this to me a bit clearer? 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++ - What is a "Regular Type" in the context of move semantics?

Alex Stepanov defined Regular Types as types satisfying certain properties around copying and equality. Now that C+ ... with move semantics. 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++ - boost::property_tree XML pretty printing

I'm using boost::property_tree to read and write XML configuration files in my application. But when I write ... and deleting empty lines? 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++ - Static and Dynamic/Shared Linking with MinGW

I want to start with a simple linking usage to explain my problem. Lets assume that there is a library z ... split them into several questions. 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++ - C++11 Implementation of Spinlock using <atomic>

I implemented SpinLock class, as followed struct Node { int number; std::atomic_bool latch; void add() { lock(); ... . What am I missing 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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c++ - How to use multiple versions of GCC

We have a new application that requires glibc 2.4 (from gcc 4.1). The machine we have runs on has gcc 3 ... using 4.1 for just this application? 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 do I generate thread-safe uniform random numbers?

My program needs to generate many random integers in some range (int min, int max). Each call will have ... return distribution(*generator); } 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++ - Namespaces and operator resolution

I am using a library that defines output stream operators (operator<<) in the global namespace. In my ... operators with namespaces. Thanks! 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 large is a DWORD with 32- and 64-bit code?

In Visual C++ a DWORD is just an unsigned long that is machine, platform, and SDK dependent. However, since ... 32-bit on 64-bit architectures? 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++ - Can't downcast because class is not polymorphic?

Is it possible to have inheritance with no virtual methods? The compiler is saying that the following code is ... type is not polymorphic) 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++ - Qt - remove all widgets from layout?

This doesn't seem easy. Basically, I add QPushButtons through a function to a layout, and when the function executes, I ... ); scroll->show(); } 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++ - Is there a way to get the string representation of HRESULT value using win API?

Is there a function in win API which can be used to extract the string representation of HRESULT value? The problem ... be used in common case. 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++ - Should I copy an std::function or can I always take a reference to it?

In my C++ application (using Visual Studio 2010), I need to store an std::function, like this: class MyClass { ... it. But is this really true? 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++ - <random> generates same number in Linux, but not in Windows

The code below is meant to generate a list of five pseudo-random numbers in the interval [1,100]. I seed the ... system("pause"); return 0; } 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++ - Layout of compiled objects

Is there a way—much like viewing the result of preprocessing with gcc -E—to see what my objects ... including MSVC would be fine. 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++ - Finding square root without using sqrt function?

I was finding out the algorithm for finding out the square root without using sqrt function and then tried to put ... give a solution for this. 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++ - Get size of terminal window (rows/columns)

Is there any reliable way of getting the number of columns/rows of the current output terminal window? I want ... also need a Windows solution. 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++ - Do built-in types have move semantics?

Consider this code: #include <iostream> using namespace std; void Func(int&& i) { ++i; } int main() { int ... it is) a well-defined behavior? 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++ - What is iterator invalidation?

I see it referenced a lot but no clear answer of what exactly it is. My experience is with higher level ... is it difficult to deal with? 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++ - What is the branch in the destructor reported by gcov?

When I use gcov to measure test coverage of C++ code it reports branches in destructors. struct Foo { virtual ~Foo() { ... 4.5.2-8ubuntu4) 4.5.2 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++ - Sharing precompiled headers between projects in Visual Studio

I have a solution with many Visual C++ projects, all using PCH, but some have particular compiler switches turned ... the project by the PCH? 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++ - Is returning references of member variables bad practice?

The following is said to be better than having First() and Second() as public members. I believe this is nearly ... void(or T) First(const T&) 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 to use source_location in a variadic template function?

The C++20 feature std::source_location is used to capture information about the context in which a ... with variadic template functions? See Question&Answers more detail:os...

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

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