Questions tagged [invocation]
187 questions
4
votes
1 answer
Options for invoking methods dynamically in C#
I've seen quite a few questions related to how do I invoke a method like this and that. What I haven't found is a listing of the different options of how to invoke a method via reflection or any other means in csharp.
Can someone explain in detail…
Sean Chambers
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4
votes
2 answers
Throwing exception by InvocationHandler
I have a lock manager as a proxy class which implements InvocationHandler,
I want this lock manager to throw exceptions (e.g. DeadLockException) to the object which is calling this proxy object, and I want the caller to be able to catch this…
Yasaman Nrn
- 41
- 1
4
votes
3 answers
Java explicit constructor invocation & Instance Initializer
In The Java Tutorials - Initializing Fields, have a description about Instance Initialization Blocks(Instance Initializer):
The Java compiler copies initializer blocks into every constructor. Therefore, this approach can be used to share a block…
Wuaner
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3
votes
2 answers
Cost of nested method invocation in Java
My assumption is that, with compiler optimization (e.g., inlining), it makes practically no difference whether a method is "nested" a few levels. Would that be the case indeed?
For example, say that the following 3 classes are declared:
public class…
PNS
- 19,295
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3
votes
2 answers
What exactly means Visibility Private?
I write the following into a script module (i.e. a psm1 file) and do Import-Module for that file:
New-Variable -Name 'mytest' -Value 'Foo' -Scope 'Global'
Now I can access this variable in my PowerShell session. $mytest yields Foo, for…
Hermjard
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- 4
3
votes
1 answer
How to use jq for a query where key is a numeric string
Recently discovered jq and am using it to format some data.
How do I use it to access fields of a json object that happen to be numeric strings?
For example, the following fails for me with an error:
echo '{"20":"twenty"}' | jq .["20"]
What's the…
David Bau
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3
votes
1 answer
Google Assistant equivalent of Alexa tell [skill] to
With Amazon Alexa it is possible to invoke an intent from a skill in 2 ways:
"Alexa start [skill name]."
And then proceed to ask that skill for a specific intent.
"Alexa tell [skill name] to [specific intent]."
With Google Assistant I only know of…
DaReal
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3
votes
2 answers
Crockford "new" method
hope someone can help me to break down a snippet of code from Crockford's JS Good Parts:
Function.method('new', function ( ) {
// Create a new object that inherits from the
// constructor's prototype.
var that = Object.create(this.prototype);
…
DanielYoshua
- 97
- 6
3
votes
4 answers
Why is null check performed after argument list evaluation?
According to C# Language Specification 7.4.3 Function member invocation the runtime processing of function member invocation consists of the following steps, where M is instance function member declared in a reference-type, E is the instance…
Andrew Karpov
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- 7
3
votes
1 answer
JNI cached jclass global reference variables being garbage collected?
I'm working in the JNI Invocation API, calling into Java from C. I have some upfront initialization to cache 30+ Java classes into global references. The results of FindClass are passed into NewGlobalRef to acquire a global reference to the class.…
bubbadoughball
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3
votes
6 answers
Simple JavaScript function with immediate invocation does not work... why?
Can anybody explain why this works:
var sayHello = function (name) {
alert("Hello there " + name + "!");
}("Mike");
While this does not:
function sayHello (name) {
alert("Hello there " + name + "!");
}("Mike");
Mike Peat
Mike Peat
- 445
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- 14
3
votes
1 answer
Calling delegates in a boxing-like fashion
I have often seen code examples of delegate invocation being done as follows:
`
public delegate void DelegateThreadActivity (T sender, U e);
public event DelegateThreadActivity OnStart = null;
public…
Raheel Khan
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2
votes
2 answers
XamlParseException stopping project
I am learning C# 2010 using the book 'Microsoft VS C# 2010 Step by Step' whose Chapter 27 introduces the Task Parallel Library. When I run the provided 'GraphDemo' project, I get an XamlParseException error.
I went over several of the threads on…
goodguy
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- 3
2
votes
1 answer
Error creating args array of jvalues for NewObjectA() function - JNI Invocation API
I'm trying to create a jobject in C++ by calling the NewObjectA() function using the JNI invocation API. However, I am unsure how I should pass arguments into the constructor. The JNI API documentation states:
jobject NewObjectA(JNIEnv *env, jclass…
Ddor
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2
votes
4 answers
How to do dynamic object creation and method invocation in .NET 3.5
How does the code looks that would create an object of class:
string myClass = "MyClass";
Of the above type, and then call
string myMethod = "MyMethod";
On that object?
thr
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