Difference between Introduce Parameter and Change Method signature in Eclipse?
Introduce parameter lets you convert a local expression to a parameter of the current method that will be added to the end of the parameter's list.
Change method signature allows you to introduce parameters without any special relation to your method's body, reorder or modify existing parameters.
A good overview can be found in Eclipse's help
http://help.eclipse.org/galileo/index.jsp?topic=/org.eclipse.jdt.doc.user/reference/ref-menu-refactor.htm (Galileo)
respectively
http://help.eclipse.org/helios/index.jsp?topic=/org.eclipse.jdt.doc.user/reference/ref-menu-refactor.htm (Helios)
If you are speaking of the Introduce parameter Object refactoring, one answer can be found here:
http://www.refactoring.com/catalog/introduceParameterObject.html
In fact this creates a new class representing your parameters where as the Change method signature allows to change method return type, visibility and parameters.
If you are speaking about the introduce parameter when a field or local variable is selected, this will just add a new parameter to the enclosing method with the same name and the same type than the selected field or local variable and thus use this parameter instead.
Manu
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I was looking inside the create_vlabel function and noted that to get the graph_name and label_name it is used graph_name = PG_GETARG_NAME(0) and label_name = PG_GETARG_NAME(1). Since these two variables are also passed as parameters, I was thinking that, if I wanted to add one more parameter to this function, then I would need to use PG_GETARG_NAME(2) to get this parameter and use it in the function's logic. Is my assumption correct or do I need to do more tweaks to do this?
You are correct, but you also need to change the function signature in the "age--1.2.0.sql" file, updating the arguments:
CREATE FUNCTION ag_catalog.create_vlabel(graph_name name, label_name name, type new_argument)
RETURNS void
LANGUAGE c
AS 'MODULE_PATHNAME';
Note that all arguments come as a "Datum" struct, and PG_GETARG_NAME automatically converts it to a "Name" struct. If you need an argument as int32, for example, you should use PG_GETARG_INT32(index_of_the_argument), for strings, PG_GETARG_CSTRING(n), and so on.
Yes, your assumption is correct. If you want to add an additional parameter to the create_vlabel function in PostgreSQL, you can retrieve the value of the third argument using PG_GETARG_NAME(2). Keep in mind that you may need to make additional modifications to the function's logic to handle the new parameter correctly.
The answers given by Fahad Zaheer and Marco Souza are correct, but you can also create a Variadic function, with which you could have n number of arguments but one drawback is that you would have to check the type yourself. You can find more information here. You can also check many Apache Age functions made this way e.g agtype_to_int2.
I am learning Editor Script of Unity recently, and I come across a piece of code in Unity Manual like this:
EditorWindowTest window = (EditorWindowTest)EditorWindow.GetWindow(typeof(EditorWindowTest), true, "My Empty Window");
I don't know why bother casting the result with (EditorWindowTest) again since the type has been specified in the parameter field of GetWindow().
Thanks in advance :)
There are multiple overloads of the EditorWindow.GetWindow method.
The one used in your code snippet is one of the non-generic ones. It accepts a Type argument which it can use at runtime to create the right type of window. However, since it doesn't use generics, it's not possible to know the type of the window at compile time, so the method just returns an EditorWindow, as that's the best it can do.
You can hover over a method in your IDE to see the return type of any method for yourself.
When using one of the generic overloads of the GetWindow method, you don't need to do any manual casting, since the method already knows at compile time the exact type of the window and returns an instance of that type directly.
The generic variants should be used when possible, because it makes the code safer by removing the need for casting at runtime, which could cause exceptions.
If you closely look, GetWindow's return type is EditorWindow. Not the EditorWindowTest, so typecasting makes sense.
https://docs.unity3d.com/ScriptReference/EditorWindow.GetWindow.html
I am developing a plugin for Clion (C++) that needs to access caller parameter name, e.g. if a function is declared:
void fun(int a);
and called
fun(42);
when the intent is invoked on 42 PsiElement it should get the corresponding parameter name, "a" in this case.
In a similar plugin for Intellij (Java), I get the parameter name with PsiCallExpression.resolveMethod() which contains the list of parameters. However, I cannot figure out how to do this in a Clion plugin. I can get a reference of a corresponding OCCallExpression, but it does not seem to contain a reference to the declared function. I tried to play around with ReferencesSearch.search(), but it did not find the declaration of the function.
At the same time, the IDE itself displays all the parameter name hints:
so I suppose it must be possible.
How can I get the parameter name for a given caller argument expression?
Please, look at InlayParameterHintsExtension.forLanguage(OCLanguage.getInstance()) and InlayParameterHintsProvider.getParameterHints
What is the difference between
this.ModuleEn=uvm_reg_field::type_id::create("ModuleEn");
and
this.ModuleEn=uvm_reg_field::type_id::create("ModuleEn",,get_full_name());
I don't see difference in simulation results.
The 2nd and 3rd arguments to create() affect the lookup of factory overrides. If you have no overrides (which is typical for RAL models), these arguments will not make any difference.
The second argument would be used to set the context of the override if you were creating this inside a uvm_component. The third argument is used to set a context via a string path, which in this case is being set by the register's path.
I have a query that I'm asking from a Java program via the Query API that requires more problem space than the default. Is the :MAX-PROBLEM-SPACE parameter accessible through the APIs? If so, how do I set it?
The com.cyc.baseclient.inference.params.DefaultInferenceParameters class provides a put method that allows you to set the value of any inference parameter that you know the SubL keyword symbol name for. For instance:
DefaultInferenceParameters params = new DefaultInferenceParameters(cyc);
params.put(CycObjectFactory.makeCycSymbol(":max-problem-count"), 500000);