Recent questions tagged C++

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c++ - Are global variables extern by default or is it equivalent to declaring variable with extern in global?

I have gone through following two questions: static and extern global variables in C and C++ global variable in ... ? Can anyone please clarify? 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++ - Constructor arguments from tuple

Suppose I have a template which is parametrized by a class type and a number of argument types. a set of ... even in the standard libraries. 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++ - Check if class is derived from a specific class (compile, runtime both answers available)

It is easier to explain on an example so, class base { //.... } class derived1 : public base { //. ... class is user-defined class derived from? 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 advantages and disadvantages of implementing classes in header files?

I love the concept of DRY (don't repeat yourself [oops]), yet C++'s concept of header files goes against ... and benefits, but what are yours? 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 check if window is "Always on top"?

In my useful hotkeys program, i have a global hotkey which sets your current foreground window to be Topmost/Not ... a function to check 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++ - 'g++' is not recognized as an internal or external command, operable program or batch file

#include<iostream> using namespace std; int main() { cout<<"hi"<<endl; return 0; } I am using Sublime text 3 ... batch file. [Finished in 0.0s] 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++ - Nested class' access to enclosing class' private data members

I'm having trouble implementing a nested class who's constructor is initialized with some of the enclosing class ... enclosing class' members? 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++ - Visual Studio 2013: CL.exe exited with code -1073741515

I have a fresh Windows 8.1 Pro x64 install with a fresh Visual Studio 2013 Pro. When trying to compile a ... I need the Windows7.1SDK tools. 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++ - Intersection of two `std::map`s

Given that I have two std::maps, say: map<int, double> A; map<int, double> B; I'd like to get ... there a clean way using the standard-library? 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++ - Template base constructor call in member initialization list error

I have a base class that looks like the following: template<typename T> class Base { public: Base(int someValue); ... update to gcc in os x. 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 does std::string not provide a conversion to const char*?

This is more of a policy or a historical question. Why was it decided not to provide a const char * ... any open discussions on this issue? 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++ - Wrote to a file using std::wofstream. The file remained empty

I wrote the following program using VS2008: #include <fstream> int main() { std::wofstream fout("myfile"); fout << ... and what I could 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++ - return 0 implicit

The last week on the ACM ICPC Mexico competition, I missed a "return 0" on a C++ program. For this reason ... Fedora system with a G++ 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++ - Getting hex through Cin

Why doesn't this code work? int x; cin >> x; With the input of 0x1a I get that x == 0 and not 26. Why's 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++ - C++11 'native_handle' is not a member of 'std::this_thread'

In the following code snippet, void foo() { std::this_thread::native_handle().... //error here } int ... from within the function foo? 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++ - Boost.Asio as header-only

I want to use ASIO library from Boost in my project. Its doc say it can be header-only if regex is not used ... that I can use header only ASIO? 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++ - Thread safety for STL queue

I am using a queue to communicate between threads. I have one reader and multiple writer threads. My question is do I ... ) in the lock as well? See Question&Answers more detail:os...

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

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259 views

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c++ - How do I call the class's destructor?

I have a simple C++ code, but I don't know how to use the destructor: class date { public: int day; ... , it will delete the day variable? 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++ - Should you overload swap in the std namespace?

I read something interesting today that said the 'standard' way to call swap on a user provided type (provided as ... own namespace (and why)? 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++ - Should "delete this" be called from within a member method?

I was just reading this article and wanted SO folks advice: Q: Should delete this; be called from within a member method? See Question&Answers more detail:os...

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

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263 views

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c++ - LLVM bitcode cross-platform

Just to be sure: Is LLVM bitcode cross-platform? By which I mean, can the generated IR (".bc") file ... are used before it actually compiles. 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++ - The CXX compiler identification is unknown

We are having trouble compiling a project using CMake (v2.8.12) under Windows 7 64Bit using Visual ... laser_control/CMakeFiles/CMakeError.log". 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++ - When will ofstream::open fail?

I am trying out try, catch, throw statements in C++ for file handling, and I have written a dummy code to catch ... else..... 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++ - What is the array form of 'delete'?

When I compiled a code using the array name as a pointer, and I deleted the array name using delete, I got a ... 's the array form 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++ - Injected class name compiler discrepancy

Consider this code: struct foo{}; int main() { foo::foo a; } I would expect this to be well ... I interpreting the standards quote incorrectly? 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 does MAKEINTRESOURCE() work?

The macro is defined as: #define MAKEINTRESOURCEA(i) ((LPSTR)((ULONG_PTR)((WORD)(i)))) #define MAKEINTRESOURCEW(i) ( ... using an ID or a name? 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++ - g++ -Wall not warning about double-> int cast

In the following snippet no warnings are produced. g++4.4.3 -Wall -pedantic //f is void f(int ); f(3.14) ... /gcc-4.4.5/gcc/Warning-Options.html 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 return bigger values from main function?

I am trying to return a bigger value like 1000 from my main function, but when I type echo $? it displays 0 ... the values which we can return? See Question&Answers more detail:os...

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

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