Recent questions tagged C++

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c++ - Base pointer to array of derived objects

Following a question asked here earlier today and multitudes of similary themed questions, I'm here to ask ... behaviour? edit: Better wording 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++ - CMake cannot determine linker language for target

To start off, I've taken a look at this post and couldn't find a solution to my problem. I'm attempting to ... to do with my library CMake 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++ - Can SFINAE detect private access violations?

I wonder whether if i test for some member of a class and the member is private what will sfinae respond? Will ... error out in the sfinae 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++ - What's the difference between a const member function and a non-const member function?

I am very confused about the const version and non-const version member function like below: value_type& top() ... would they be 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++ - Best way to determine if two path reference to same file in Windows?

How would I compare 2 strings to determine if they refer to the same path in Win32 using C/C++? While ... to match an existing C# question. 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 pointers to string literals remain valid after a function returns?

Is the pointer returned by the following function valid? const char * bool2str( bool flg ) { return flg ? "Yes" ... C++ standard say about 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++ - Qt moc with implementations inside of header files?

Is it possible to tell the Qt MOC that I would like to declare the class and implement it in a single file rather ... into an .h and .cpp 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++ - Will exit() or an exception prevent an end-of-scope destructor from being called?

Let's say I have the following code: struct mytype { ~mytype() { /* do something like call Mix_CloseAudio ... from somewhere inside start() ? 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++ - Casting a large number type to a smaller type

I've had a good look around and can't find a similar question so apologies if it has been asked before. I' ... and the above results are luck? 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++ - Private inheritance VS composition : when to use which?

Private inheritance VS composition. I'm having a little confusion when to use each. Since private inheritance ... use composition? 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 do I compile for Windows XP with Visual Studio 2012?

Ok, so I'm using Visual Studio 2012 in Windows 7 x64 for programming and compiling. My application works fine ... it working for Windows XP. 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++ - constexpr not working if the function is declared inside class scope

I am using g++4.8.0, which doesn't contain earlier constexpr bug. Thus below code works fine: constexpr int size ... way or yet another g++ 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++ - Why can't templates be within extern "C" blocks?

This is a follow-up question to an answer to Is it possible to typedef a pointer-to-extern- C -function type ... ) would have C++ linkage? 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++ - Enable a single warning in Visual Studio

Is there a compiler switch to enable a single warning in Visual Studio? The reason I ask is I want ... Warnings still only mention disabling. 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 "strip" (GCC application) used for?

what is this little application for? When using it without any options reduces the size of the executables, but how/what it does? See Question&Answers more detail:os...

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

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324 views

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c++ - What Is a Curly-Brace Enclosed List If Not an intializer_list?

I asked a question here: Lifetime Extension of a initializer_list return involving the non-functional code: const auto ... list in curly-braces? 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 c++20 modules with CMake?

Clang and MSVC already supports Modules TS from unfinished C++20 standard. Can I build my modules based project ... UPD: question is closed). 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++ - Throw in constexpr function

The following piece of code compiles under clang++ 3.7.0 but is denied by g++ 5.3.1. Both have -std ... : 32;@m32 Selected multilib: .;@m64 See Question&Answers more detail:os...

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

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255 views

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c++ - Why the sizeof(bool) is not defined to be one, by the Standard itself?

Size of char, signed char and unsigned char is defined to be 1 byte, by the C++ Standard itself. I'm wondering ... char), and it's all variants. 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 are arguments which do not match the conversion specifier in printf undefined behavior?

In both C (n1570 7.21.6.1/10) and C++ (by inclusion of the C standard library) it is undefined ... arguments in printf which make it UB? See Question&Answers more detail:os...

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

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258 views

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c++ - can't modify char* - Memory access violation

Why does it say "Memory access violation"? char* str = "HelloGuys"; int len = strlen(str); for (int i=0; i<(len/2) ... i]; //error str[i] = 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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293 views

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c++ - how to optimize matrix multiplication (matmul) code to run fast on a single processor core

I am working on parallel programming concepts and trying to optimize matrix multiplication example on single core. The ... 0802 Grade = 33.1204 See Question&Answers more detail:os...

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

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203 views

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c++ - How are local and global variables initialized by default?

Based on below, am i right? global_A reference is initialized to null. global_int is 0 local_A reference is null ... local_int; A local_A; } 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++ - TCP/IP connection on a specific interface

I'd like to connect to a server using one of two network routes. How would one do this? I've Googled quite a ... TCP/IP. EDIT: Windows 7 client See Question&Answers more detail:os...

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

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282 views

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c++ - What is the use of 0-length array (or std::array)?

In C++11 it allows you to create a 0 length C array and std:array like this: int arr1[0]; std::array ... a pointer, where does it pointing to? See Question&Answers more detail:os...

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

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361 views

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c++ - Boost Spirit X3 cannot compile repeat directive with variable factor

I am trying to use the Boost Spirit X3 directive repeat with a repetition factor that is variable. The basic ... solving this issue. Thank you. See Question&Answers more detail:os...

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

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316 views

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c++ - Using std:fstream how to deny access (read and write) to the file

How can I deny access to a file I open with fstream? I want to unable access to the file while I'm reading/writing to it with fstream? See Question&Answers more detail:os...

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

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378 views

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c++ - Is there a reference_wrapper<> for rvalue references?

I wonder how the following can be done void f(string &&s) { std::string i(move(s)); /* other stuff */ ... for std::ref, in this 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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