[英]How can I remove the warning that my iterator has a non-virtual destructor when extending boost::iterator_facade?
When compiling with -Weffc++ and extending boost::iterator_facade, I get the compiler warning: base class has a non-virtual destructor. 当使用-Weffc ++进行编译并扩展boost :: iterator_facade时,我得到了编译器警告:基类具有非虚拟析构函数。 What can I do to fix this?
我该怎么做才能解决此问题?
Here is sample code: 这是示例代码:
#include <iostream>
#include <boost/iterator/iterator_facade.hpp>
struct my_struct_t {
int my_int;
my_struct_t() : my_int(0) {
}
};
class my_iterator_t : public boost::iterator_facade<
my_iterator_t,
my_struct_t const,
boost::forward_traversal_tag
> {
private:
friend class boost::iterator_core_access;
my_struct_t my_struct;
public:
my_iterator_t() : my_struct() {
}
void increment() {
++ my_struct.my_int;
}
bool equal(my_iterator_t const& other) const {
return this->my_struct.my_int == other.my_struct.my_int;
}
my_struct_t const& dereference() const {
return my_struct;
}
};
int main() {
my_iterator_t my_iterator;
std::cout << my_iterator->my_int << "\n";
++my_iterator;
std::cout << my_iterator->my_int << "\n";
return 0;
}
I compile on Fedora 19 like this: 我像这样在Fedora 19上编译:
$ g++ test.cpp -std=gnu++0x -Weffc++ -o test
Here is the actual warning: 这是实际的警告:
g++ test.cpp -std=gnu++0x -Weffc++ -o test
test.cpp:10:7: warning: base class ‘class boost::iterator_facade<my_iterator_t, const my_struct_t, boost::forward_traversal_tag>’ has a non-virtual destructor [-Weffc++]
class my_iterator_t : public boost::iterator_facade<
^
Thanks. 谢谢。
-Weffc++ option enables warnings about violations of the some style guidelines from Scott Meyers' Effective C++ book. -Weffc ++选项启用有关违反Scott Meyers的Effective C ++书籍中的某些样式准则的警告。 Your code violates the Item 7: Make destructors virtual in polymorphic base classes.
您的代码违反了条款7:在多态基类中使析构函数虚拟化。 So the compiler isn't complaining about your iterator, it's about the base class: boost::iterator_facade.
因此,编译器不会抱怨您的迭代器,而是关于基类的:boost :: iterator_facade。 I don't think you can eliminate the warning by modify your own code.
我认为您无法通过修改自己的代码来消除警告。 As to why virtual destructor in polymorphic base classes are so important, a good answer is here .
关于为什么多态基类中的虚拟析构函数如此重要, 这里有一个很好的答案。
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.