# 1. declare a resource type foo
class foo {

  # 2. define a resource type myfile
  define myfile {
    $file_name = $name
    file { "$file_name":
      path    => "/tmp/$file_name",
      ensure  => 'file',
    }
  }

  # 3. define a resource type that declares virtual resources of type myfile
  define create_a_file { @myfile { $name:; } }

  # 4. get a list of files to create
  $files = ['a', 'list', 'of', 'files']

  # 5. declare create_a_file resources for all files
  create_a_file { $files:; }

  # 6. realize myfile resources for all virtually declared myfile resource types
  Myfile <||> # yes, capital M
}

# 7. declare resouce type foo
class { 'foo':; }