RubyのMemoryView入門（４）

前

code:ext/learning_memory_view/learning_memory_view.c

VALUE cConstInteViewer;

// ...

static VALUE

const_int_viewer_initialize(VALUE self, VALUE memory_view)

{

rb_iv_set(self, "memory_view", memory_view);

return Qnil;

}

static VALUE

const_int_viewer_get_data(VALUE self)

{

VALUE memory_view = rb_iv_get(self, "memory_view");

rb_memory_view_t view;

if (!rb_memory_view_available_p(memory_view)) {

rb_raise(rb_eRuntimeError, "memory view is not available");

}

if (!rb_memory_view_get(memory_view, &view, RUBY_MEMORY_VIEW_SIMPLE)) {

rb_raise(rb_eRuntimeError, "failed to get memory view");

}

VALUE rv = rb_ary_new2(1);

int *data = (int *)view.data; /* Use format instead of casting? */

for (int i = 0; i < view.byte_size / view.item_size; i++) {

}

return rv;

}

// ...

void

Init_learning_memory_view(void)

{

VALUE mod = rb_define_module("LearningMemoryView");

// ...

cConstInteViewer = rb_define_class_under(mod, "ConstIntViewer", rb_cObject);

rb_define_method(cConstInteViewer, "initialize", const_int_viewer_initialize, 1);

rb_define_method(cConstInteViewer, "data", const_int_viewer_get_data, 0);

}

code:test/test_learning_memory_view.rb

require "test/unit"

require "fiddle"

require "learning_memory_view"

class TestLearningMemoryView < Test::Unit::TestCase

include LearningMemoryView

def test_initialize

assert_instance_of FloatArray, FloatArray.new

end

class TestConstInt < self

def test_const_int

const_int = ConstInt.new

Fiddle::MemoryView.export const_int do |memory_view|

assert_equal 4, memory_view.item_size

assert_equal 4, memory_view.byte_size

assert_equal "l*", memory_view.format

end

end

def test_const_int_viewer

const_int = ConstInt.new

viewer = ConstIntViewer.new(const_int)

end

end

end

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