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Exercises/soln6_5.md

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+# Exercise 6.5 - Solution
+
+```python
+# validate.py
+...
+
+from inspect import signature
+
+class ValidatedFunction:
+    def __init__(self, func):
+        self.func = func
+        self.signature = signature(func)
+        self.annotations = dict(func.__annotations__)
+        self.retcheck = self.annotations.pop('return', None)
+
+    def __call__(self, *args, **kwargs):
+        bound = self.signature.bind(*args, **kwargs)
+
+        for name, val in self.annotations.items():
+            val.check(bound.arguments[name])
+
+        result = self.func(*args, **kwargs)
+
+        if self.retcheck:
+            self.retcheck.check(result)
+
+        return result
+
+# Examples
+if __name__ == '__main__':
+    def add(x:Integer, y:Integer) -> Integer:
+        return x + y
+
+    add = ValidatedFunction(add)
+```
+
+
+
+[Back](ex6_5.md)