Recent questions tagged C++

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c++ - What differences, if any, between C++03 and C++11 can be detected at run-time?

It is possible to write a function, which, when compiled with a C compiler will return 0, and when compiled with a C+ ... isCpp11() { //??? } 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++ - Difference between CC, gcc and g++?

What are the difference between the 3 compilers CC, gcc, g++ when compiling C and C++ code in terms of ... libraries, language features, etc.? 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 point of const pointers?

I'm not talking about pointers to const values, but const pointers themselves. I'm learning C and C++ beyond ... what's the advantage of const? 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++ - shared_ptr and weak_ptr differences

I am reading Scott Meyers "Effective C++" book. It was mentioned that there are tr1::shared_ptr and tr1:: ... (again, with example please). 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++ - "please check gdb is codesigned - see taskgated(8)" - How to get gdb installed with homebrew code signed?

I'm under osx 10.8.4 and have installed gdb 7.5.1 with homebrew (motivation get a new gdb with new features ... / hints out there ? Thx Pelle 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 Visual Studio project properties effectively for multiple projects and configurations

I have always used Visual Studios built in GUI support for configuring my projects, often using property sheets so ... these sorts of changes. 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 I hint the optimizer by giving the range of an integer?

I am using an int type to store a value. By the semantics of the program, the value always varies in ... the compiler to do those optimizations? 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++ - Futures vs. Promises

I'm confusing myself with difference between a future and a promise. Obviously, they have different methods and ... a future from my promise 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++ - C++11 std::threads vs posix threads

Why should I prefer one or another in practice? What are technical differences except that std::thread is a class? 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: Project structure with unit tests

I am trying to structure my project to include the production sources (in src subfolder) and tests (in ... results in a reasonable structure? 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 use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?

I have always seen people write class.h #ifndef CLASS_H #define CLASS_H //blah blah blah #endif The question is, why ... is in the class.cpp? 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++ - Coding Practices which enable the compiler/optimizer to make a faster program

Many years ago, C compilers were not particularly smart. As a workaround K&R invented the register keyword, to ... [Edit] Offset related link 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 Linux’s native GUI API?

Both Windows (Win32 API) and OS X (Cocoa) have their own APIs to handle windows, events and other OS stuff. ... platform. How can it be native? 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++ - Compiling an application for use in highly radioactive environments

We are compiling an embedded C++ application that is deployed in a shielded device in an environment bombarded ... a long-running application? 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 "cout" works weird for "unsigned char"?

I have the following code: cvtColor (image, image, CV_BGRA2RGB); Vec3b bottomRGB; bottomRGB=image.at<Vec3b>(821,1232 ... is the reason for 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++ - if statement not working right?

I've looked and looked with the debugger and cannot seem to figure out why the IF statement always prints the message. ... ) { ... Thanks guys. 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 are the benefits of a binary heap with root at arr[0]

I am writing a binary heap over an array arr. Every node except the leaf nodes have two children. The root can ... putting the root at arr[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++ - Using an iterator to Divide an Array into Parts with Unequal Size

I have an array which I need to divide up into 3-element sub-arrays. I wanted to do this with iterators, but I ... can't I do the first version? 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++ - Cut set of a graph, Boost Graph Library

I've been struggling a lot to figure out how to do this. I'm interested in quickly finding the cut set ... be greatly appreciated. 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++ - Toy shell not piping correctly

I'm not going to lie. This is a homework question. However, as far as I'm concerned, the points are gone ... the two-pipe variant of my code. 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 change text or background color in a Windows console application

Which C++ function changes text or background color (MS Visual studio)? For example cout<<"This text"; how to make "This text" red color. 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 happens when I assign a number larger than INT_MAX to an int?

Suppose I assign an eleven digits number to an int, what will happen? I played around with it a little bit ... How is this new number created? 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++ - Undefined symbol on a template operator overloading function

I have this function declaration: template<class T> a::A& a::A::operator<<(T out) { std::cout << out; return ... << <int>(int) why is that? 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 constexpr objects around

I decided to give then new C++14 definition of constexpr a spin and to get the most out of it I ... different approach to solving the problem? 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++ - Const variable changed with pointer in C

The variable i is declared const but still I am able to change the value with a pointer to the memory location ... type Output is this 100 100 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::pow produce different result in 32 bit and 64 bit application

I have found the mismatch in the result of some complex calculations. When i thoroughly observed the ... to overcome this difference. 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 do two functions have the same address?

Consider this function template: template<typename T> unsigned long f(void *) { return 0;} Now, I print the ... on this are valuable. :-) 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 initialize `std::function` with a member-function?

I am trying to learn std::function and here's my code: #include <iostream> #include <functional> struct Foo ... member function as a parameter? See Question&Answers more detail:os...

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

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