RubyのMemoryView入門（３）

前

（TODO: 説明）

code:ext/learning_memory_view/learning_memory_view.c

VALUE cFloatArray;

VALUE cConstInt;

typedef struct {

} const_int_t;

static bool

const_int_get_memory_view(const VALUE obj, rb_memory_view_t *view, int flags)

{

const_int_t *const_int;

Data_Get_Struct(obj, const_int_t, const_int);

view->obj = obj;

view->data = const_int->data;

view->byte_size = sizeof(const_int->data);

view->readonly = true;

view->format = "l*";

view->item_size = sizeof(int);

view->item_desc.components = NULL;

view->item_desc.length = 0;

view->ndim = 1;

view->shape = NULL;

view->sub_offsets = NULL;

view->private_data = NULL;

return true;

}

static bool

const_int_release_memory_view(const VALUE obj, rb_memory_view_t *view)

{

return true;

}

static bool

const_int_memory_view_available_p(const VALUE obj)

{

return true;

}

static VALUE

const_int_s_allocate(VALUE klass)

{

const_int_t *const_int;

return Data_Make_Struct(klass, const_int_t, NULL, NULL, const_int);

}

static VALUE

const_int_initialize(VALUE self)

{

const_int_t *const_int;

Data_Get_Struct(self, const_int_t, const_int);

return Qnil;

}

static const rb_memory_view_entry_t const_int_view_entry = {

const_int_get_memory_view,

const_int_release_memory_view,

const_int_memory_view_available_p

};

void

Init_learning_memory_view(void)

{

VALUE mod = rb_define_module("LearningMemoryView");

cFloatArray = rb_define_class_under(mod, "FloatArray", rb_cObject);

cConstInt = rb_define_class_under(mod, "ConstInt", rb_cObject);

rb_define_alloc_func(cConstInt, const_int_s_allocate);

rb_memory_view_register(cConstInt, &const_int_view_entry);

rb_define_method(cConstInt, "initialize", const_int_initialize, 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

end

end

参考

テスト用のMemoryView実装。MemoryViewの実装の参考に

よく分からんこと

エンディアンがどう関わってくるのか

次