Recent questions tagged c++

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c++ - "to_string" isn't a member of "std"?

Okay, so I have tmp.cpp: #include <string> int main() { std::to_string(0); return 0; } But when I try ... wrong or is there a bug somewhere? 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 add constructors/destructors to an unnamed class?

Is there a way to declare a constructor or a destructor in an unnamed class? Consider the following void ... assigned by the compiler? 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 is pow(int, int) so slow?

I've been working on a few project Euler exercises to improve my knowledge of C++. I've written the ... expression compute so much slower? 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 iterate over a Constant Vector?

I have a vector of Student which has a field name. I want to iterate over the vector. void print(const vector< ... illegal in C++. Please help. 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 can I print 0x0a instead of 0xa using cout?

How can I print 0x0a, instead of 0xa using cout? #include <iostream> using std::cout; using std::endl; using std:: ... showbase << 10 << endl; } 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 was the space character not chosen for C++14 digit separators?

As of C++14, thanks to n3781 (which in itself does not answer this question) we may write code like the ... it ready for the fractional input. 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 usual way of controlling frame rate?

I'm new to graphics, so I don't know how people usually control the frame rate for rendering things. I mean, ... need to code it from scratch. 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++ - Eclipse CDT: Unresolved inclusion of stl header

I'm trying to use Eclipse to edit sources, compiled under C++ Builder, but stuck with Unresolved inclusion ... it sees #include <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++ - Passing reference to STL vector over dll boundary

I have a nice library for managing files that needs to return specific lists of strings. Since the only code I'm ... me as to a better 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++ - How many spaces for tab character( )?

I want to implement a text drawing function. But I am not sure how works, which means I don't know ... standard algorithm? Thanks in advance. 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++ - Cross-platform iteration of Unicode string (counting Graphemes using ICU)

I want to iterate each character of a Unicode string, treating each surrogate pair and combining character sequence as a ... 4" } 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++ - In lambda functions syntax, what purpose does a 'capture list' serve?

Taken from an answer to this question, as an example, this is a code that calculates the sum of elements ... more than just nameless 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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c++ - Using shared_ptr in dll-interfaces

I have an abstract class in my dll. class IBase { protected: virtual ~IBase() = 0; public: virtual ... compilers (or different settings). 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++ - openMP nested parallel for loops vs inner parallel for

If I use nested parallel for loops like this: #pragma omp parallel for schedule(dynamic,1) for (int x = 0; ... other than creating a new task? 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++ - Address of labels (MSVC)

We are writing a byte-code for a high-level compiled language, and after a bit of profiling and optimization, ... is much appreciated, 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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188 views

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c++ - How to programmatically create a shortcut using Win32

I need to programmatically create a shortcut using C++. How can I do this using Win32 SDK? What API function can be used for this 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++ - LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup

I have the following error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartup, There are ... is the 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++ - std::vector of references

I have such problem: I have class Foo, and if have some objects of this class, Foo a(); I need to put this ... Boost, but I can't use Boost. See Question&Answers more detail:os...

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

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314 views

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c++ - How to check if a process has the administrative rights

How do I properly check if a process is running with administrative rights? I checked the IsUserAnAdim function in ... rights in Windows 7. 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 I have to bind a UDP socket in my client program to receive data? (I always get WSAEINVAL)

I am creating a UDP socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP) via Winsock and trying to recvfrom on this socket, but it ... :endl; } 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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346 views

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c++ - What is use of the ref-qualifier `const &&`?

I've been digging around ref-qualifiers a bit, following on a previous question. Given the code sample below; ... const && 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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298 views

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c++ - error for hash function of pair of ints

I have the following class with an unordered_map member, and a hash function defined for pair<int,int> ... ::_Default_ranged_hash, 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++ - Class template argument deduction not working with alias template

consider the code pasted below. I have defined a very simple class, for which the compiler generates an implicit ... HEAD- --with-jit) 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 get CMake to recognize pthread on Ubuntu?

If I compile on the command-line with g++ directly, I can see everything I need is there: $ g++ ... -- Configuring incomplete, errors occurred! 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 enable /std:c++17 in VS2017 with CMake

I'm trying to add the /std:c++17 compiler flag to VS2017 with CMake. I'm using the "modern" cross- ... possible. Both work for the 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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81 views

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c++ - What are customization point objects and how to use them?

The last draft of the c++ standard introduces the so-called "customization point objects" ([customization.point. ... why are they objects? 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++ - macro definition containing #include directive

Is there a way to define a macro that contains a #include directive in its body? If I just put the "#include ... of a macro expansion Any help? See Question&Answers more detail:os...

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

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277 views

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c++ - What does _T stands for in a CString

What does the "T" represents in a string. For example _T("Hello").I have seen this in projects where ... .What it actually tells the processor See Question&Answers more detail:os...

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

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