Recent questions tagged C++

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I'm making a Deck class for a C++ program. It needs to have two methods: one to pop a card off the ... assuming a 'good' level of randomness)? 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 enumerate enum members using SWIG

Can I expose a C++ enum to SWIG as a real entity rather than a set of constants so I can enumerate over them in python 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++ - Binary search to find the range in which the number lies

I have an array Values array: 12 20 32 40 52 ^ ^ ^ ^ ^ 0 1 2 3 4 on which I have to perform ... variables such as bool found is not allowed. 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 some convincing arguments to upgrade from Visual Studio 6?

I have a client who is still using Visual Studio 6 for building production systems. They write multi-threaded ... these issues have bitten you. 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++ - Disable warning in MSVC++2010

I have the following code: /** Stupidly copies unicode chars into normal chars. */ std::string wstring2string(__in ... How can I disable 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++ - Why VC++ Strings are not reference counted?

STL standard do not require from std::string to be refcounted. But in fact most of C++ implementations provide ... over fixing the issue? 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++ - Looking for sse 128 bit shift operation for non-immediate shift value

The intrinsic _mm_slli_si128 will do a logical shift left of a 128 bit register, but is restricted to immediate shift ... Is there a better way? 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 std::sort() without prefix "std" and also without "using namespace std;" compiles successfully

As sort() is defined in namespace std it must always be used as std::sort.But the following code compiles correctly ... I can't figure it out. 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 make a shared library delay loaded on Linux

I've been searching a way to make a shared library (let's name the library libbar.so) delay loaded on Linux ... the option flag. Best regards, 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 input iterators be used where forward iterators are expected?

To my knowledge, the hierarchy of iterator categories goes like this: Random access -> Bi-directional -> Forward ... this sort of thing? 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++ - When should WS_EX_NOREDIRECTIONBITMAP be used?

MSDN says (Extended Window Styles): WS_EX_NOREDIRECTIONBITMAP: The window does not render to a redirection surface. ... drawing using Direct3D? 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++ - Does std::multiset guarantee insertion order?

I have a std::multiset which stores elements of class A. I have provided my own implementation of operator< ... to achieve this using multiset? 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++ - Implementation of string pattern matching using Suffix Array and LCP(-LR)

During the last weeks I tried to figure out how to efficiently find a string pattern within another string. ... Added link to referenced paper See Question&Answers more detail:os...

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

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308 views

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c++ - GCC incorrectly captures global variables by reference in lambda functions?

GCC seems to incorrectly capture global variables by reference in lambda functions, even when they are specified ... the erroneous assignment. 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 enable C++11 for Android Studio?

I'm using Android studio 1.3.2+ndk-r11b-windows-x86_64 and try to build project with native code and C++11 ... but it's seems didn't work. See Question&Answers more detail:os...

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

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382 views

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c++ - Is there a way to disable constructor synthesizing on a class?

Suppose I have a class that I want to make sure my compiler (GCC in this case) doesn't synthesize any ... or something which signifies this. 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++ - Determine processor support for SSE2?

I need to do determine processor support for SSE2 prior installing a software. From what I understand, I came ... processor support for SSE2? See Question&Answers more detail:os...

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

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304 views

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c++ - Precompiled Headers? Do we really need them

Back a long time ago I used to use pre-compiled headers: a. to speed compilation and b. because I supported ... that would simplify my life too. See Question&Answers more detail:os...

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

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192 views

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c++ - Making swap faster, easier to use and exception-safe

I could not sleep last night and started thinking about std::swap. Here is the familiar C++98 version: ... you see additional problems? Discuss! 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++ - Pointer addition and element size

At: http://www.fredosaurus.com/notes-cpp/arrayptr/26arraysaspointers.html Under: Pointer addition and element size There ... become "4"? 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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252 views

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c++ - Using a class member as a default argument for a member function

Is there another way than manually overloading the corresponding member function and calling the first overload with the ... reason for 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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362 views

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c++ cli - Pass an argument by reference in C++/CLI so re-assignment affects the caller

Probably this is not a difficult question, but I am always a little bit confused on how to treat String ... function_2? Thanks for any advice. See Question&Answers more detail:os...

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

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193 views

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c++ - Validity of the code

Consider the following code : void populate(int *arr) { for(int j=0;j<4;++j) arr[j]=0; } int main( ... valid or not? Am I missing something? See Question&Answers more detail:os...

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

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429 views

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c++ - Confusion on iterators invalidation in deque

I'm bit confused regarding iterator invalidation in deque. (In the context of this question) Following is the ... the standard say on this? See Question&Answers more detail:os...

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

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427 views

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c++ - difference between void(int) & void (*)(int)

I know void (*)(int) is to function pointer but what is void(int)? It's used for std::function template. ... but decltype(fun) gives void(int) See Question&Answers more detail:os...

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

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398 views

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c++ - Is pointer arithmetic on allocated storage allowed since C++20?

In the C++20 standard, it is said that array types are implicit lifetime type. Does it mean that an array to ... std::string("second element"); See Question&Answers more detail:os...

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

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230 views

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c++ - Why "long int" has same size as "int"? Does this modifier works at all?

Ehm.. I kind' of though this modifiers like long / short expands / reduces amount of memory allocated when ... and int as separate types. 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++ - Get visible rectangle of QGraphicsView?

I've been pulling my hair out with this one for hours. There's a thread here about it, but nothing seems to ... ,232), Qt::DiagCrossPattern)); } See Question&Answers more detail:os...

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

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