Recent questions tagged C++

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c++ - What does "for(;;)" mean?

In C/C++, what does the following mean? for(;;){ ... } 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 doesn't an if constexpr make this core constant expression error disappear?

In reference to this question. The core constant expression that is used to initialize the constexpr variable y is ill-formed ... / Head 6.0.0). 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++ - _GNU_SOURCE and __USE_GNU

I want to use CPU_SET, which is a glibc linux-specific macro that should be defined in sched.h The ... that defining __USE_GNU is sufficient? 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++ - Which type of sorting is used in the std::sort()?

Can anyone please tell me that which type of sorting technique (bubble, insertion, selection, quick, merge, count ... <algorithm> header file? 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 write a Float Mat to a file in OpenCV

I have a matrix Mat B(480,640,CV_32FC1); containing floating values..I want to write this matrix to a file which ... done?? if yes, how ?? 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++ - Legal to overwrite std::string's null terminator?

In C++11, we know that std::string is guaranteed to be both contiguous and null-terminated (or more ... -terminator with a null character? 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::vector resize downward

The C++ standard seems to make no statement regarding side-effects on capacity by either resize(n), ... for any implementation restrictions? 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++ - Raw pointer lookup for sets of unique_ptrs

I often find myself wanting to write code like this: class MyClass { public: void addObject(std::unique_ptr< ... + that solves this problem? 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 constructor on derived object

When you have a derived object with a move constructor, and the base object also has move semantics, what is ... call to std::move necessary? 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 declare constexpr class in a header and define it in a separate .cpp file?

I have a class Dimension which I defined (like all my classes) in a file Dimension.h: class Dimension { ... does separate definition not work? 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 C2065: 'cout' : undeclared identifier

I am working on the 'driver' part of my programing assignment and i keep getting this absurd error: error ... and include iostream and ostream. 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++ - Initialize global array of function pointers at either compile-time, or run-time before main()

I'm trying to initialize a global array of function pointers at compile-time, in either C or C++. Something ... neater/smarter way 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++ - Edges on polygon outlines not always correct

I'm using the algorithm below to generate quads which are then rendered to make an outline like this http://img810.imageshack. ... ].y); } } } } 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++ - Copy 2D array using memcpy?

So I want to copy the contents of a 2D array to another array of the exact same type. Here is how the array ... , so any help would be welcome! 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++ - Returning non-const reference from a const member function

Why does returning the reference to a pointed-to member variable work, but not the other? I know that a const ... doesn't compile 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++ - How to produce deterministic binary output with g++?

I work in a very regulated environment where we need to be able to produce identical binary input give ... produce identical binary outputs? 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++ - Looking for 16-bit x86 compiler

I am working on an embedded systems project and have run into an issue of the compiler being programatically embedded in ... can do it as well? 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 access variables defined and declared in one function in another function?

Can anyone tell me how to access variables declared and defined in a function in another function. E.g void ... is there any other way ? 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++ - Linking files in g++

Recently I have tried to compile a program in g++ (on Ubuntu). Usually i use Dev-C++ (on Windows) ... function. Any help will be 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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c++ - true isometric projection with opengl

I am a newbie in OpenGL programming with C++ and not very good at mathematics. Is there a simple way ... Code snippets are highly 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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c++ - using static libraries instead of dynamic libraries in opencv

I have a project in visual studio 2012 which uses opencv dynamic libraries. It compiled, linked and worked well ... lib This solved the problem. See Question&Answers more detail:os...

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

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463 views

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c++ - Using OpenMP with clang

I have problems compiling OpenMP code using clang (both 3.6 and 3.8 ToT). I followed this blog post http:// ... didn't help. ` Any suggestions? See Question&Answers more detail:os...

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

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267 views

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c++ - float bits and strict aliasing

I am trying to extract the bits from a float without invoking undefined behavior. Here is my first attempt: unsigned foo ... u); return u; } See Question&Answers more detail:os...

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

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386 views

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c++ - SQLite with Android NDK

Is it somehow possible to use SQLite with C++ on an Android phone? I haven't found any documentation around how this could be possible. 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 a Linked-List implementation without using pointers possible or not?

My question is very simple, can one using C++, implement a link-list data structure without using pointers ( ... the amount of memory available. 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 Does std::enable_if work?

I just asked this question: std::numeric_limits as a Condition I understand the usage where std::enable_if will define the ... bar) { isInt(); } See Question&Answers more detail:os...

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

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292 views

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c++ - Should the Copy-and-Swap Idiom become the Copy-and-Move Idiom in C++11?

As explained in this answer, the copy-and-swap idiom is implemented as follows: class MyClass { private: ... did I miss something important? 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++ - When do programmers use Empty Base Optimization (EBO)

I was reading about Empty Base Optimization(EBO). While reading, the following questions popped up in my mind: What is ... at loss in ANY way? See Question&Answers more detail:os...

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

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