Recent questions tagged metaprogramming

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metaprogramming - Is it possible to run code after each line in Ruby?

I understand that it is possible to decorate methods with before and after hooks in ruby, but is it possible ... given set of classes/methods. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - Ruby String#to_class

Taken from a previous post with some modifications to respond to sepp2k's comment about namespaces, I have ... assert_nil "Something".to_class See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - Groovy - overriding invokeMethod for a single instance

I have an instance of a java object, let's say an instance of ArrayList called myList. For this particular ... I going about this correctly? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - dynamically adding functions to a Python module

Our framework requires wrapping certain functions in some ugly boilerplate code: def prefix_myname_suffix(obj): def ... would be appreciated! See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - Is anyone using meta-meta-classes / meta-meta-meta-classes in Python/ other languages?

I recently discovered metaclasses in python. Basically a metaclass in python is a class that creates a class. There ... to research it further. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - How can I inspect what is the default value for optional parameter in ruby's method?

Given a class, class MyClass def index(arg1, arg2="hello") end end Is it possible to obtain the ... like Class#instance_method, or something? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - Python, import string of Python code as module

In python you can do something like this to import a module using a string filename, and assign its namespace a ... solution to what I'm doing. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - Change the context/binding inside a block in ruby

I have a DSL in Ruby that works like so: desc 'list all todos' command :list do |c| c.desc 'show todos in ... is possible and how I might do it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - Dynamic method calling in Ruby

As far as I am aware there are three ways to dynamically call a method in Ruby: Method 1: s = ... methods of calling dynamic methods have? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - C++/C++11 - Switch statement for variadic templates?

Let's say I have a few structs like this: struct MyStruct1 { inline void DoSomething() { cout << " ... function pointer solution as well. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - Adding class attributes using a for loop in Python

I was trying to generate a class from a dictionary: class attr: for key in objects_type: setattr(attr, key, ... similar to the first form? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - How to unroll a short loop in C++

I wonder how to get something like this: Write copy(a, b, 2, 3) And then get a[2] = b[2]; a[3] = ... "simple" trick, and Boost is too "messy". See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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322 views

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metaprogramming - Javascript automatic getter/setters (John Resig Book)

I'm reading "Pro Javascript Techniques" from John Resig, and I'm confused with an example. This is the code: ... everyone for the feedback! +1 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - What is "for" in Ruby

In Ruby: for i in A do # some code end is the same as: A.each do |i| # some code end for is not a kernel method ... to: total = I.sum {|i] x[i]} See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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414 views

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metaprogramming - Python add to a function dynamically

how do i add code to an existing function, either before or after? for example, i have a class: class A(object): ... is there a way to do this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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549 views

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metaprogramming - Ruby: define_method vs. def

As a programming exercise, I've written a Ruby snippet that creates a class, instantiates two objects from ... argument for method_missing... See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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334 views

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metaprogramming - Find the source file containing R function definition

I come from a python background and am trying to get up to speed with R, so please bear with me I have an R ... this result [1] "path/util.R" See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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metaprogramming - Ruby: why does puts call to_ary?

I'm learning metaprogramming in Ruby and am just trying out defining missing methods via method_missing and define_method. ... an instance of X See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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676 views

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metaprogramming - How to dynamically alter inheritance in Ruby

I would like to dynamically specify the parent class for a class in Ruby. Consider this code: class Agent def ... from which it was called? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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299 views

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metaprogramming - Assigning to an instance's __class__ attribute in Python

Under what circumstances is it possible, and when is it impossible, to assign to an instance's __class__ attribute in ... really do it for me. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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524 views

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metaprogramming - Undefine variable in Ruby

Let's say I'm using irb, and type a = 5. How do I remove the definition of a so that typing a returns a ... undef a' # though this doesn't work. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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512 views

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metaprogramming - Creating meta language with Java

guys! I need to create some sort of meta language which I could embed in XML and then parse with Java. ... where should I start looking? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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404 views

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metaprogramming - Valid characters in a python class name

I'm dynamically creating python classes, and I know not all characters are valid in this context. Is there a ... take precedence in such case. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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615 views

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metaprogramming - Dynamic/runtime method creation (code generation) in Python

I need to generate code for a method at runtime. It's important to be able to run arbitrary code and have ... way of achieving the same result? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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446 views

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metaprogramming - How to find out the arity of a method in Python

I'd like to find out the arity of a method in Python (the number of parameters that it receives). Right ... ' object has no attribute 'func_co See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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465 views

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metaprogramming - Get locals from calling namespace in Python

I want to retrieve the local variables from Python from a called function. Is there any way to do this? I ... a different module to its caller. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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