Recent questions tagged C++

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c++ - Align cout format as table's columns

I'm pretty sure this is a simple question in regards to formatting but here's what I want to accomplish: ... Test2 2 Iamlongverylongblah 2 Etc 1 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++ - Why can't I initialize a reference in an initializer list with uniform initialization?

That is, why does this: struct S {}; struct T { T(S& s) : s{s} {} S& s; }; int main() { S s; T ... clang accepts it, so perhaps it's a GCC bug? 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 difference between using a struct with two fields and a pair?

What is the difference regarding memory allocation and efficiency between using a struct with two fields and a pair? 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++ - Move semantics == custom swap function obsolete?

Recently, many questions pop up on how to provide your own swap function. With C++11, std::swap will use ... certain reference variables? Hm... 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++ - pure/const function attributes in different compilers

pure is a function attribute which says that a function does not modify any global memory. const is a function ... , ICC, MSVC or others? 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++ - error: 'INT32_MAX' was not declared in this scope

I'm getting the error error: 'INT32_MAX' was not declared in this scope But I have already included #include < ... know if anything is unclear! 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 does the comma operator do?

What does the following code do in C/C++? if (blah(), 5) { //do something } 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++ - Floating point Endianness?

I'm writing a client and a server for a realtime offshore simulator, and, as I have to send a lot of data ... if someone can help me with 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++ - Brace elision in std::array initialization

Suppose there's an std::array to be initialized. It's okay if using double braces: std::array<int, 2> x ... list-initialization, or it doesn'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++ - Is it possible to force a function not to be inlined?

I want to force a little function not to be compiled as inline function even if it's very simple. I think ... there any keyword to do 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++ - Convert std::string to QString

I've got an std::string content that I know contains UTF-8 data. I want to convert it to a QString. ... the from-ASCII conversion in Qt? 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++ - Sorting a std::map by value before output & destroy

I'm aware that map is not prepared to be sorted. It's heavily optimized for fast and random key access and ... 10 values destroy vector and map 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++ - Object oriented programming in Haskell

I'm trying to get an understanding of object oriented style programming in Haskell, knowing that things are going to be ... to Animals in C++. 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++ - Convert a Static Library to a Shared Library (create libsome.so from libsome.a): where's my symbols?

the title of this question is an exact dupe, but the answers in that question don't help me. I have a bunch of ... .so from foo.o and bar.o. 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 std::ifstream significantly slower than FILE?

I've been informed that my library is slower than it should be, on the order of 30+ times too slow parsing ... entire file, even for this size. See Question&Answers more detail:os...

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

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473 views

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c++ - How to serialize derived template classes with Boost.serialize?

I'd like to serialize/unserialize following classes: class Feature{ ... virtual string str()=0; }; template< ... /load these type of classes? 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 handle arbitrarily large integers

I'm working on a programming language, and today I got the point where I could compile the factorial function( ... translating code to C++. 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++ - Getting an array of bytes out of Windows::Storage::Streams::IBuffer

I have an object that implements the interface Windows::Storage::Streams::IBuffer, and I want to get an array of ... :Streams::IBuffer in C++? See Question&Answers more detail:os...

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

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371 views

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c++ - Understanding region of interest in openCV 2.4

I know that in OpenCV 2.1 we had a function to set ROI: cvSetImageROI(), but such a function does not exist in 2 ... ); waitKey(0); 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++ - Where are temporary object stored?

Is it true that temporary objects are stored in dynamic (heap) memory? See Question&Answers more detail:os...

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

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284 views

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c++ - How to test an EXE with Google Test?

I have a C++ project in Visual Studio, and have added another project exclusively for testing. Both of these ... is where the problem lies. See Question&Answers more detail:os...

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

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514 views

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c++ - static member initialization for specialized template class

class A { }; template <typename A, int S> class B { public: static int a[S]; B() { a[0] = 0; ... the array holds some data specific to the type. 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 avoid undefined execution order for the constructors when using std::make_tuple

How can I use std::make_tuple if the execution order of the constructors is important? For example ... , catalog, someOtherSerializableClass> 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++ - pair<int,int> pair as key of unordered_map issue

My code: typedef pair<int,int> Pair tr1::unordered_map<Pair,bool> h; h.insert(make_pair(Pair(0,0),true)); ... ' Something I need to fix? 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++ - OpenCV: Find all non-zero coordinates of a binary Mat image

I'm atttempting to find the non-zero (x,y) coordinates of a binary image. I've found a few references to the ... To specify, this is using C++ 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 stl vector concurrent read thread-safe?

I am working on a application where huge number of threads are expected to iterate over set of string values and try ... gcc version is 4.5.x See Question&Answers more detail:os...

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

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668 views

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c++ - Undefined reference to google::protobuf::internal::empty_string_[abi:cxx11]

I'm trying to build simple test application with Protocol Buffers 2.6.1 and GNU GCC 5.1.0 (on Ubuntu ... Any help would be greatly appreciated. See Question&Answers more detail:os...

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

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506 views

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c++ - Visual Studio 2017 can't find windows.h

Hell'o I've just installed Visual Studio 2017 (enterprise).I opened my project whom I created in Visual Studio ... library. How to repair 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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