metaprogramming

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Rails How can one query association definitions

I have a lot of dynamic code which keeps complex relations in a string. ex: \"product.country.continent.planet.galaxy.name\"[详细]

2023-04-01 16:39 分类：问答
Python: Add function to an array in a FOR loop

Maybe this is a simple issue, but I could not find any information about it so far. For an optimization in numpy I need an array of functions. The number of functions I need depends on the current obj[详细]

2023-04-01 11:02 分类：问答
List of base classes for use with variadic templates

Is there a way to access all base classes of a 开发者_如何学Cclass in C++? Since variadic templates are available I think it would make sense to have e.g. ___BASE which is a variadic list of all types[详细]

2023-04-01 05:09 分类：问答
Wrapping ActiveRecord methods with additional functionality

I want to enhance the ActiveRecord setters in Rails to ensure only valid values are saved. One such place where this is needed is phone numbers. A user may enter a phone number in a variety of formats[详细]

2023-03-31 23:23 分类：问答
Nils and method chaining

I\'m just breaking into the ruby world and I could use a helping hand. Suppose b is nil. I\'d like the following code to return nil instead of a \"NoMethodError: undefined method\"[详细]

2023-03-31 19:18 分类：问答
Basic metaprogramming: extending an existing class using a module?

I\'d like part of my module to extend the String class. This doesn\'t work module MyModule class String[详细]

2023-03-31 13:18 分类：问答
getting access to the variable name inside self.method_added

I believe in Ruby, there is a way to access the name of all local variables within a block. def some_method(param1, param2)[详细]

2023-03-31 11:05 分类：问答
Quick sort at compilation time using C++11 variadic templates

I just implemented the quick sort algorithm by using C++11 variadic templates to evaluate it at compilation time. However, I encounter a performance issue when the data set is too large.[详细]

2023-03-31 04:21 分类：问答
Static arrays at compile time in C++

I was wondering if its possible to make the following answer more generic, in the sense that the type of the array be templated instead of just unsigned:[详细]

2023-03-30 21:09 分类：问答
Why is it important to learn about metaprogramming and eigenclasses in Ruby?

I am currently experimenting with Ruby and Rails, and I\'ve hit a few sections in tutorials and books about metaprogramming.Many mention that it is an essential component of Ruby but they don\'t reall[详细]

2023-03-30 04:30 分类：问答