Class: GirFFI::SizedArray

Inherits:
Object
  • Object
show all
Includes:
Enumerable
Defined in:
lib/gir_ffi/sized_array.rb

Overview

Class representing an array with a determined size

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(element_type, size, pointer) ⇒ SizedArray

Returns a new instance of SizedArray.



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# File 'lib/gir_ffi/sized_array.rb', line 7

def initialize element_type, size, pointer
  @element_type = element_type
  @size = size
  @pointer = pointer
end

Instance Attribute Details

#element_type ⇒ Object (readonly)

Returns the value of attribute element_type.



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# File 'lib/gir_ffi/sized_array.rb', line 5

def element_type
  @element_type
end

#size ⇒ Object (readonly)

Returns the value of attribute size.



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# File 'lib/gir_ffi/sized_array.rb', line 5

def size
  @size
end

Class Method Details

.copy_value_to_pointer(value, pointer) ⇒ Object 



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# File 'lib/gir_ffi/sized_array.rb', line 40

def self.copy_value_to_pointer value, pointer
  size = value.size_in_bytes
  pointer.put_bytes(0, value.to_ptr.read_bytes(size), 0, size)
end

.from(element_type, size, item) ⇒ Object 



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# File 'lib/gir_ffi/sized_array.rb', line 60

def from element_type, size, item
  return unless item

  case item
  when FFI::Pointer
    wrap element_type, size, item
  when self
    from_sized_array size, item
  else
    from_enumerable element_type, size, item
  end
end

.get_value_from_pointer(pointer) ⇒ Object 



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# File 'lib/gir_ffi/sized_array.rb', line 36

def self.get_value_from_pointer pointer
  pointer
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/gir_ffi/sized_array.rb', line 28

def ==(other)
  self.to_a == other.to_a
end

#each(&block) ⇒ Object 



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# File 'lib/gir_ffi/sized_array.rb', line 22

def each &block
  size.times do |idx|
    yield index(idx)
  end
end

#index(idx) ⇒ Object 



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# File 'lib/gir_ffi/sized_array.rb', line 17

def index idx
  ptr = GirFFI::InOutPointer.new element_type, @pointer + idx * element_size
  ptr.to_ruby_value
end

#size_in_bytes ⇒ Object 



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# File 'lib/gir_ffi/sized_array.rb', line 32

def size_in_bytes
  size * element_size
end

#to_ptr ⇒ Object 



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# File 'lib/gir_ffi/sized_array.rb', line 13

def to_ptr
  @pointer
end