如何调用存储在向量中的对象的方法?以下代码失败...
ClassA * class_derived_a = new ClassDerivedA; ClassA * class_another_a = new ClassAnotherDerivedA; vector< ClassA *> test_vector; test_vector.push_back(class_derived_a); test_vector.push_back(class_another_a); for(vector< ClassA *> :: iterator it = test_vector.begin(); it!= test_vector.end(); it ++) it-> printOutput();代码检索到以下错误:
test3.cpp:47:error:请求成员'printOutput'在'* it .__ gnu_cxx :: __ normal_iterator< _Iterator,_Container> :: operator-> _Iterator = ClassA **,_Container = std :: vector>',其中是非类类型'ClassA *'
问题似乎是 it-> printOutput(); 但是目前我不知道如何正确调用该方法,有谁知道? / p>
关于mikey
解决方案向量中的东西是指针。您需要:
(* it) - > printOutput它引用迭代器从向量中获取指针,然后使用 - >功能。如果向量包含对象而不是指针,那么您在问题中显示的语法将有效。在这种情况下,迭代器就像指向这些对象之一的指针。
How do I call a method of an object which is stored within a vector? The following code fails...
ClassA* class_derived_a = new ClassDerivedA; ClassA* class_another_a = new ClassAnotherDerivedA; vector<ClassA*> test_vector; test_vector.push_back(class_derived_a); test_vector.push_back(class_another_a); for (vector<ClassA*>::iterator it = test_vector.begin(); it != test_vector.end(); it++) it->printOutput();The code retrieves the following error:
test3.cpp:47: error: request for member ‘printOutput’ in ‘* it.__gnu_cxx::__normal_iterator<_Iterator, _Container>::operator-> with _Iterator = ClassA**, _Container = std::vector >’, which is of non-class type ‘ClassA*’
The problem seems to be it->printOutput(); but at the moment I don't know how to call the method properly, does anyone know?
regards mikey
解决方案The things in the vector are pointers. You need:
(*it)->printOutput();which dereferences the iterator to get the pointer from the vector, then uses -> on the pointer to call the function. The syntax you show in your question would work if the vector contained objects rather than pointers, in which case the iterator acts like a pointer to one of those objects.
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