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#The Nerv OOP#
Part of the [Nerv](../README.md) toolkit.
##Methods##
+* __metatable mt, metatable mpt = nerv.class(string tname, string parenttname)__
+This method is used to create a class by the name `tname`, which inherits `parenttname` in __Nerv__, then you create a new instance of this class by calling `obj=tname(...)`. The `tname.__init(...)` method(if defined) will be called in the constructing. The metatable of the class and its parent class will be returned.
+
+##Examples##
+* This example implements a simple `nerv.Counter` class which is inherited by `nerv.BetterCounter`.
+
+```
+do
+ nerv.class("nerv.Counter")
+ function nerv.Counter:__init(c)
+ if (c) then
+ self.c = c
+ else
+ self.c = 0
+ end
+ end
+end
+do
+ local mt, mpt = nerv.class("nerv.BetterCounter", "nerv.Counter")
+ function nerv.BetterCounter:__init(c, bc)
+ mpt.__init(self, c)
+ if (bc) then
+ self.bc = bc
+ else
+ self.bc = 0
+ end
+ end
+end
+c1 = nerv.Counter(1)
+print(c1.c)
+bc1 = nerv.BetterCounter(1, 1)
+print(bc1.c, bc1.bc)
+``` \ No newline at end of file