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extconf_example's Introduction

How to make ruby c extension

Create extconf.rb

require 'mkmf'

create_header
create_makefile 'name_of_c_file'

create c file

#include "ruby.h"
#include "extconf.h"

// VALUE is ruby type
// define c function
// define init function

void Init_mod_name() {
  VALUE mod = rb_define_module("module_name");
  rb_define_method(mod, "method_name", function, arg_count);
}

Create make file

ruby extconf.rb

Make object/bundle

make

Create Ruby File

require './module.so/bundle'

include ModuleName
method_name(args)

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