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c++ wrapper for header encapsulation


By : user6021512
Date : October 17 2020, 06:10 PM
will be helpful for those in need I am trying to write a wrapper class which wraps around another class containing c based header files and functions. , You need to tell the compiler/linker it's a C header:
code :
extern "C" {
#include "c_header.h"
}


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Import feature added to my program breaks OOP encapsulation. How do I restore encapsulation?


By : Sean Bailey
Date : March 29 2020, 07:55 AM
it fixes the issue To get to the exact design you need to first define what would be your merge strategy in case there is a conflict between private members at their most atomic level.
Overwrite with latest Keep original Merge the changes

Block encapsulation vs. local encapsulation - let


By : ganesh timilsina
Date : March 29 2020, 07:55 AM
help you fix your problem The former is a reasonable option if you want to use the value like a static constant within a lexically scoped block of code. Typically you would do this if:
The value is expensive to compute, and you want to do it only once when the namespace is loaded The value is genuinely constant, i.e. will not change across function invocations The value will be used across multiple function definitions (i.e. you put multiple defns inside the let block) (Possibly?) because you want to use the value inside a macro expansion, and embedding the let inside the macro expansion itself would add unnecessary complexity.

simple_form collection wrapper (radios buttons) : double encapsulation of items


By : Seong-il Choi
Date : March 29 2020, 07:55 AM
To fix the issue you can do Summary:
I had done something similar to this before by creating a custom input that inherits from SimpleForm::Inputs::CollectionRadioButtonsInput and overloading just a few methods. For more on custom input components, see https://github.com/plataformatec/simple_form/wiki/Adding-custom-input-components.
code :
# File: app/inputs/semantic_ui_radio_buttons_input.rb

class SemanticUiRadioButtonsInput < SimpleForm::Inputs::CollectionRadioButtonsInput

  # Creates a radio button set for use with Semantic UI

  def input
    label_method, value_method = detect_collection_methods
    iopts = { 
      :checked => 1,
      :item_wrapper_tag => 'div',
      :item_wrapper_class => 'field',
      :collection_wrapper_tag => 'div',
      :collection_wrapper_class => 'grouped inline fields'
     }
    return @builder.send(
      "collection_radio_buttons",
      attribute_name,
      collection,
      value_method,
      label_method,
      iopts,
      input_html_options,
      &collection_block_for_nested_boolean_style
    )
  end # method

  protected

  def build_nested_boolean_style_item_tag(collection_builder)
    tag = String.new
    tag << '<div class="ui radio checkbox">'.html_safe
    tag << collection_builder.radio_button + collection_builder.label
    tag << '</div>'.html_safe
    return tag.html_safe
  end # method

end # class
-# File: app/views/<resource>/_form.html.haml

-# Define the collection
- child_care_coll = %w( Infant Toddler Preschool Kindergarten ).map!.with_index(1).to_a

-# Render the radio inputs
= f.input :child_care_type,
  :collection    => child_care_coll,
  :label_method  => :first,
  :value_method  => :last,
  :as            => :semantic_ui_radio_buttons
<div class="input semantic_ui_radio_buttons optional childcare_child_care_type">

  <label class="semantic_ui_radio_buttons optional control-label">
    Child care type
  </label>

  <div class="grouped inline fields">

    <div class="field">
      <div class="ui radio checkbox">
        <input checked="checked" class="semantic_ui_radio_buttons optional" id="childcare_child_care_type_1" name="childcare[child_care_type]" type="radio" value="1">
        <label for="childcare_child_care_type_1">Infant</label>
      </div>
    </div>

    ...

    <div class="field">
      <div class="ui radio checkbox">
        <input class="semantic_ui_radio_buttons optional" id="childcare_child_care_type_4" name="childcare[child_care_type]" type="radio" value="4">
        <label for="childcare_child_care_type_4">Kindergarten</label>
      </div>
    </div>

  </div>

</div>

Why does compiling a header file with a D option result in a much bigger file than using a C wrapper for the header?


By : niharika miryala
Date : March 29 2020, 07:55 AM
it fixes the issue Because gcc decides what to do with the input based on its extension, silly me. The true equivalent compilation line is:
code :
gcc -I. -c -D SOME_CONTROL_FLAG -x c -o thefile.o thefile.h

Encapsulation in header files


By : Criousblack
Date : March 29 2020, 07:55 AM
this will help To restrict the creation of the class, make the constructor of class A private and declare class B as a friend class. This way only B can instantiate A.
code :
class B;
class A
{
private:
    A();
    friend class B;
};
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