Recent questions tagged C++

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int x=0; string fullname = ""; float salary; float payincrease; float newsal; float monthlysal; float retroactive; ... stop when input is asked? 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++ - Calculate system time using rdtsc

Suppose all the cores in my CPU have same frequency, technically I can synchronize system time and time stamp ... from the real system time. 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++ - Correct format for HTTP POST using QNetworkRequest

I'm trying to send a JSON query to a web service and I continue to get internal server errors as a ... >post(request,baseString.toUtf8()); 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++ - Forward declaration & circular dependency

I've got two classes, Entity and Level. Both need to access methods of one another. Therefore, using #include, ... majority of Level in Entity? 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++ - Issue with cin when spaces are inputted, using string class

I have the following code: main.cpp #include <iostream> #include <string> using namespace std; string name; string age; ... it comes to C++. 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 real reason to not use the EOF bit as our stream extraction condition?

Inspired by my previous question A common mistake for new C++ programmers is to read from a file with ... ) as our extraction condition? 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++ - Sorting a vector of objects by a property of the object

I'm working on a project for school and need to sort some data. I've been given a vector of objects and I ... best way to go about doing 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++ - How do I call a pointer-to-member-function?

I'm getting a compile error (MS VS 2008) that I just don't understand. After messing with it for many hours, ... PFN. What am I missing here? 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++ - Oracle OCI, bind variables, and queries like ID IN (1, 2, 3)

Succinct Version: I'm looking for a C++ OCI adaptation of the following Java technique, where code is able to bind ... this approach to C++ OCI? 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 a 32 bit processor support 64 bit integers?

In C++, you can use an int which is usually 4 bytes. A long long integer is usually 8 bytes. If ... the alu add larger integers or something? 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++ - Building boost with Visual Studio 2013 (Express)

Has anyone successfully built Boost using Visual Studio 2013 Express? I'm confused as to whether or not this ... least the Serialization error. 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++ - Legality of using operator delete on a pointer obtained from placement new

I'm dang certain that this code ought to be illegal, as it clearly won't work, but it seems to be allowed ... be used as the operand of delete. 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++ - CUDA linking error - Visual Express 2008 - nvcc fatal due to (null) configuration file

I've been searching extensively for a possible solution to my error for the past 2 weeks. I have successfully ... mypause(); 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++ - Open file with fopen, given absolute path on Windows

I'm trying to make a program that counts the number of lines of a file, when I try to pass the absolute ... program so you can open the 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++ - Why is iterating 2D array row major faster than column major?

Here is simple C++ code that compare iterating 2D array row major with column major. #include <iostream> ... is faster than column major? 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 the C++11 'auto' keyword work for static members?

class Foo { public: static const char *constant_string; }; auto Foo::constant_string = "foo"; int main(void) { }; ... keyword, or a bug in gcc+ 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 set ROI in OpenCV?

I have two images, the first one smaller than the other. I need to copy the second image on the first image. ... ; imshow ("Gravity", *output); 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 I access a protected member from an instance of a derived class?

I haven't done C++ in a while and can't figure out why following doesn't work: class A { protected: int ... derived classes? What am I missing? 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++ - Segmentation Fault With Char Array and Pointer in C on Linux

So I have the following program: int main(){ char* one = "computer"; char two[] = "another"; two[1]='b'; ... "two[1]='b' does not segfault? 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++ - Adding signals/slots (QObject) to QGraphicsItem: performance hit?

I want to add signals/slots to a QGraphicsItem so I can reach QGraphicsItemObjects from another thread. There ... ) avoid this penalty? See Question&Answers more detail:os...

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

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600 views

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c++ - Iterator = pointer? Or what is it?

Is an iterator in C++ a pointer? The reason I ask is that it seems like nobody completely understands what an ... to. Is it a correct analogy? See Question&Answers more detail:os...

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

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580 views

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c++ - Unbuffered output with cout

How can you get unbuffered output from cout, so that it instantly writes to the console without the need to flush (similar ... "A"; sleep(5); } 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 there a limit of stack size of a process in linux

Is there a limit on the stack size of a process in Linux? Is it simply dependent on the RAM of the machine? ... calls to a function. 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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c++ - What does the & (ampersand) at the end of member function signature mean?

I can't remember which talk it was, but recently I watched some talks from CppCon 2017 and there someone mentioned as ... . So what does it do? 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 OpenMP with C++11 on Mac OS

I am trying to use some OpenMP multithreading features in my C++11 code like: #pragma omp parallel for When I try to compile ... ^ ~~~~~~~~~~~~~ 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 you compare two character strings statically at compile time

I would like to create a macro which can compare 2 strings, and emit a compile time error if the condition ... the 2 strings at compile time. See Question&Answers more detail:os...

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

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891 views

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c++ - Invalid initialization of non-const reference with C++11 thread?

I'm getting an error about error: invalid initialization of non-const reference of type int&' from an rvalue ... Why is this error occurring? 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: cannot convert 'const wchar_t [13]' to 'LPCSTR {aka const char*}' in assignment

// include the basic windows header file #include <windows.h> #include <windowsx.h> // the WindowProc function prototype ... , 1 warnings ===| See Question&Answers more detail:os...

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

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