polymorphism

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overloading << operators and inherited classes

I\'ve got a base class and then several derived classes. I would like to overload the \"<<\" operator for these derived classes. For normal operators, i.e. \'+\', virtual functions do the trick.[详细]

2023-04-11 18:11 分类：问答
Rails 3 - Attaching polymorphic image model as different image types per each model, what am i doing wrong?

i keep getting an ActiveRecord::UnknownAttributeError: unknown attribute: image开发者_C百科able_id[详细]

2023-04-11 18:08 分类：问答
Designing hiearchical classes with template function

I am writing a class Base which has a member function taking a template parameter: class Base { template<class T>[详细]

2023-04-11 04:21 分类：问答
has_many :through - complicated model

I have a pretty complicated set of models and I\'m trying to figure out how to set it all up so that rails will generate chained queries (though I\'m not sure it is possible). So my question ends up b[详细]

2023-04-11 02:02 分类：问答
Java - Array of Inner Classes inside of Outer Class

Let\'s say I have: public class A { public A() { ... } ... public class B { public B() { ...开发者_运维知识库[详细]

2023-04-10 21:17 分类：问答
Declare variable of composite type in PostgreSQL using %TYPE

Question: How can I declare a variable of the same type a parameter in a stored function? The simple answer is use %TYPE, this works:[详细]

2023-04-10 21:10 分类：问答
C++ Polymorphism of Comparison Operator by Value and by Reference

I want to compare two objects that are derived from the same base type but are not the same derived class. So I made the == operator virtual and over-ride it in derived classes.[详细]

2023-04-10 20:39 分类：问答
Polymorphism in Mongoid

Is it possible to get real polymorphism in Mongoid? Example: class Company include Mongoid::Document has_many :workers, as: :workable[详细]

2023-04-10 07:03 分类：问答
How to simulate virtuality for method template

I have a class hierarchy where I want to introduce a method template that would behave like if it was virtual. For example a simple hierarchy:[详细]

2023-04-10 06:40 分类：问答
GWT 2.4.0 RequestFactory polymorphism

Does GWT 2.4 support this case: @Entity class MyBase {...} @Entity class MyChild1 extends MyBase {...} @Entity class MyChild2 extends MyBase {...}[详细]

2023-04-10 05:50 分类：问答