Recent questions tagged C++

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c++ - Passing the caller __FILE__ __LINE__ to a function without using macro

I'm used to this: class Db { _Commit(char *file, int line) { Log("Commit called from %s:%d", file, line ... __LINE__) is worst. So, 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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c++ - c++11 struct initialization compilation error

struct SS {int a; int s;}; int main () { vector<SS> v; v.push_back(SS{1, 2}); } The code ... ) note: candidate expects 1 argument, 2 provided 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++ - Is there a way to prevent a method from being overridden in subclasses?

Is anyone aware of a language feature or technique in C++ to prevent a child class from over riding a ... non-virtual inherited function X. 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 test the current version of GCC at compile time?

I would like to include a different file depending on the version of GCC. More precisely I want to write: #if ... just can't find it again. 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++ - If a functions return an int, can an int be assigned to it?

If a function returns an int, can it be assigned by an int value? I don't see it makes too much sense to assign a value ... int& f() {} f() = 1; 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++ - Strange Behaviour Class Objects Inside Union

Hi I wanted know the reasons of the following code void main() { class test { public: test(){} int k; }; ... Reasons. Thank you in Advance. :) 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 do I run XPath queries in QT?

How do I run an XPath query in QT? I need to sort out certain tags with specific values in a certain ... entries with the type 'ignore'. 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 should happen to template class static member variables with definition in the .h file

If a template class definition contains a static member variable that depends on the template type, I'm ... required/reliable linker behavior? 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 refresh a QSqlTableModel while preserving the selection?

I am using a QSqlTableModel and QTableView to view an SQLite database table. I would like to have the table auto ... more or less works now... 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++ - Precise floating-point<->string conversion

I am looking for a library function to convert floating point numbers to strings, and back again, in C++. ... -poor-printing-of-floating-point/ 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++ - Comparing doubles

I'm writing a program that consists of a while loop that reads two doubles and prints them. The program also prints ... . How would I do 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++ - Multiple threads reading from the same file

My platform is windows vista 32, with visual c++ express 2008 . for example: if i have a file contains 4000 ... give a example in C language. 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++ - Smooth color transition algorithm

I am looking for a general algorithm to smoothly transition between two colors. For example, this image is taken ... a different color space ? 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++ - Parsing through a csv file in Qt

Is anyone familiar with how to parse through a csv file and put it inside a string list. Right now I am taking the ... (); return a.exec(); } 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++ - Overloading output stream operator for vector<T>

What is a recommended way to overload the output stream operator? The following can not be done. It is ... namespace. Thanks for assistance. See Question&Answers more detail:os...

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

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191 views

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c++ - Perfect forwarding a member of object

Suppose I have two structs: struct X {}; struct Y { X x; } I have functions: void f(X&); void ... for perfect forwarding and make it scalable? 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++ - Static initialization and destruction of a static library's globals not happening with g++

Until some time ago, I thought a .a static library was just a collection of .o object files, just ... have them automatically called? 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++ - Nested Class member function can't access function of enclosing class. Why?

Please see the example code below: class A { private: class B { public: foobar(); }; public: foo(); bar(); ... 2008). Thank you for your help. 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++ - Should mutexes be mutable?

Not sure if this is a style question, or something that has a hard rule... If I want to keep the ... be preferred? Please justify your view. 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++ - whether rand_r is real thread safe?

Well, rand_r function is supposed to be a thread safe function. However, by its implementation, I cannot believe it ... = next; return result; } 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++ - Is it possible to make efficient pointer-based binary heap implementations?

Is it even possible to implement a binary heap using pointers rather than an array? I have searched around the ... when you remove root again? 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 is proper way to detect all available serial ports on Windows?

There are several ways to list serial ports under Windows but I'm not sure what is the proper way: the way ... work on Windows XP SP2 or above 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 do I intercept messages being sent to a window?

I want to intercept messages that are being sent to a window in a different process. What is the best way ... help would be much appreciated. 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++ - Virtual friend functions for a base class?

I'm in the proccess of learning the language and this is a noob doubt. Is it possible to use a virtual friend ... <<() called for each one. 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++ - Sending Protobuf Messages with boost::asio

I'm trying to hack a client together in C++ using Google's Protocol Buffers and boost::asio. My problem is ... the solution, thanks a lot! 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++ - Method chaining + inheritance don't play well together?

Consider: // member data omitted for brevity // assume that "setAngle" needs to be implemented separately // ... Thanks for the efforts anyhow. 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++ - SDL2: LNK1561: entry point must be defined

I want to compile this code: #include <SDL.h> int main(int argc, char* argv[]) { return 0; } But it can't ... ? VS 2012 SP3, empty C++ project. 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++ - Where to put common writable application files?

I thought that CSIDL_COMMON_APPDATAcompanyproduct should be the place to put files that are common for all users of ... on this somewhere? See Question&Answers more detail:os...

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

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