[英]Eclipse polymorphism using C++11 shared_ptr error
Given the following sample code: 给出以下示例代码:
#include <iostream>
#include <memory>
using namespace std;
struct A {
public:
A(int aa) : a(aa) {}
int a;
virtual ~A() {}
};
struct B : A {
public:
B(int aa, int bb) : A(aa), b(bb) {}
int b;
};
void f(shared_ptr<A> a){
shared_ptr<B> b = dynamic_pointer_cast<B>(a);
if (b) {
cout << b->b << endl;
} else {
cout << a->a << endl;
}
}
int main() {
auto a = make_shared<A>(3);
auto b = make_shared<B>(7, 4);
f(a);
f(b);
return 0;
}
Eclipse indicates that there is an error on the line Eclipse表示该行有错误
f(b);
saying Invalid arguments ' Candidates are: void f(std::shared_ptr<A>) '
说Invalid arguments ' Candidates are: void f(std::shared_ptr<A>) '
because a shared_ptr<B>
has been passed. 因为已经传递了shared_ptr<B>
。 This compiles and runs, and has output: 这编译并运行,并输出:
3
4
as expected. 正如所料。
The indexer and compiler have -std=c++11 specified. 索引器和编译器指定了-std = c ++ 11。
The compiler also has the symbol __GXX_EXPERIMENTAL_CXX0X__
defined. 编译器还定义了符号__GXX_EXPERIMENTAL_CXX0X__
。
Is there any way to get rid of this error and its red squiggles in Eclipse (preferably without modifying the source)? 有没有办法摆脱这个错误及其在Eclipse中的红色波形(最好不修改源代码)?
我建议您在可能不支持C ++ 11的设置中禁用静态代码分析插件Codan。
This has been fixed in later versions of CDT (I just tried it). 这已在CDT的后续版本中修复(我刚刚尝试过)。
You can use a nightly build of CDT using this repository: Go to Help, and enter the url http://download.eclipse.org/tools/cdt/builds/kepler/nightly 您可以使用此存储库使用每晚构建的CDT:转到帮助,然后输入URL http://download.eclipse.org/tools/cdt/builds/kepler/nightly
If you don't feel like using a nighty build, you should at least make sure you have the latest released version (at this writing it is 8.1.1), using http://download.eclipse.org/tools/cdt/releases/juno/ 如果你不想使用一个夜间版本,你应该至少确保你有最新发布的版本(在撰写本文时它是8.1.1),使用http://download.eclipse.org/tools/cdt/发布/朱诺/
My full setup of eclipse with C++11 is found here: http://scrupulousabstractions.tumblr.com/post/36441490955/eclipse-mingw-builds 我在这里找到了完整的使用C ++ 11进行eclipse的设置: http : //scrupulousabstractions.tumblr.com/post/36441490955/eclipse-mingw-builds
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