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tutorial tweaks

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[SVN r16004]
This commit is contained in:
Joel de Guzman
2002-10-28 08:30:31 +00:00
parent f346eaf693
commit 7b091b86d2
1 changed files with 14 additions and 6 deletions
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20
doc/tutorial/doc/quickstart.txt
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@@ -378,8 +378,8 @@ attributes can just be a different syntax for a method call. Wrapping our
[^Num] class using Boost.Python:
class_<Num>("Num")
.add_property("rovalue", &Var::get)
.add_property("value", &Var::get, &Var::set);
.add_property("rovalue", &Num::get)
.add_property("value", &Num::get, &Num::set);
And at last, in Python:
@@ -392,7 +392,7 @@ And at last, in Python:
Take note that the class property [^rovalue] is exposed as [*read-only]
since the [^rovalue] setter member function is not passed in:
.add_property("rovalue", &Var::get)
.add_property("rovalue", &Num::get)
[page:1 Inheritance]
@@ -520,7 +520,7 @@ available, since Base is an abstract class.
In Python, let us try to instantiate our [^Base] class:
>>> base = Base()
AttributeError: ...
RuntimeError: This class cannot be instantiated from Python
Why is it an error? [^Base] is an abstract class. As such it is advisable
to define the Python wrapper with [^no_init] as we have done above. Doing
@@ -528,7 +528,15 @@ so will disallow abstract base classes such as [^Base] to be instantiated.
[h2 Deriving a Python class]
Now, at last, we can even derive from our base class [^Base] in Python:
Now, at last, we can even derive from our base class Base in Python. Before
we can do that, we have to set up our class_ wrapper as:
class_<Base, BaseWrap, boost::noncopyable>("Base")
;
Otherwise, we have to suppress the Base class' [^no_init] by adding an
[^__init__()] method to all our derived classes. [^no_init] actually adds
an [^__init__] method that raises a Python RuntimeError exception.
>>> class Derived(Base):
... def f(self):
@@ -1122,7 +1130,7 @@ the construct:
.value("blue", blue)
;
can be used to expose it to Python. The new enum type is created in the
can be used to expose to Python. The new enum type is created in the
current [^scope()], which is usually the current module. The snippet above
creates a Python class derived from Python's [^int] type which is
associated with the C++ type passed as its first parameter.