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Use ref objects with inheritance in Tut2 (fixes #1817)

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def 2015-03-25 23:38:58 +01:00
commit 748a7b866f
1 changed files with 12 additions and 10 deletions
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22
doc/tut2.txt
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@ -56,12 +56,12 @@ Objects have access to their type at runtime. There is an
.. code-block:: nim .. code-block:: nim
type type
Person = object of RootObj Person = ref object of RootObj
name*: string # the * means that `name` is accessible from other modules name*: string # the * means that `name` is accessible from other modules
age: int # no * means that the field is hidden from other modules age: int # no * means that the field is hidden from other modules
Student = object of Person # Student inherits from Person Student = ref object of Person # Student inherits from Person
id: int # with an id field id: int # with an id field
var var
student: Student student: Student
@ -69,6 +69,7 @@ Objects have access to their type at runtime. There is an
assert(student of Student) # is true assert(student of Student) # is true
# object construction: # object construction:
student = Student(name: "Anton", age: 5, id: 2) student = Student(name: "Anton", age: 5, id: 2)
echo student[]
Object fields that should be visible from outside the defining module have to Object fields that should be visible from outside the defining module have to
be marked by ``*``. In contrast to tuples, different object types are be marked by ``*``. In contrast to tuples, different object types are
@ -228,7 +229,7 @@ is needed:
.. code-block:: nim .. code-block:: nim
type type
Socket* = object of RootObj Socket* = ref object of RootObj
FHost: int # cannot be accessed from the outside of the module FHost: int # cannot be accessed from the outside of the module
# the `F` prefix is a convention to avoid clashes since # the `F` prefix is a convention to avoid clashes since
# the accessors are named `host` # the accessors are named `host`
@ -241,8 +242,8 @@ is needed:
## getter of hostAddr ## getter of hostAddr
s.FHost s.FHost
var var s: Socket
s: Socket new s
s.host = 34 # same as `host=`(s, 34) s.host = 34 # same as `host=`(s, 34)
(The example also shows ``inline`` procedures.) (The example also shows ``inline`` procedures.)
@ -313,8 +314,8 @@ dispatching:
.. code-block:: nim .. code-block:: nim
type type
Thing = object of RootObj Thing = ref object of RootObj
Unit = object of Thing Unit = ref object of Thing
x: int x: int
method collide(a, b: Thing) {.inline.} = method collide(a, b: Thing) {.inline.} =
@ -326,8 +327,9 @@ dispatching:
method collide(a: Unit, b: Thing) {.inline.} = method collide(a: Unit, b: Thing) {.inline.} =
echo "2" echo "2"
var var a, b: Unit
a, b: Unit new a
new b
collide(a, b) # output: 2 collide(a, b) # output: 2