Merge pull request #135 from robertwb/bang

Cython bang operator overloading.

Cython/Compiler/ExprNodes.py

@@ -6939,6 +6939,19 @@ class NotNode(ExprNode):
 
     def analyse_types(self, env):
         self.operand.analyse_types(env)
+        if self.operand.type.is_cpp_class:
+            type = self.operand.type
+            function = type.scope.lookup("operator!")
+            if not function:
+                error(self.pos, "'!' operator not defined for %s"
+                    % (type))
+                self.type = PyrexTypes.error_type
+                return
+            func_type = function.type
+            if func_type.is_ptr:
+                func_type = func_type.base_type
+            self.type = func_type.return_type
+        else:
             self.operand = self.operand.coerce_to_boolean(env)
 
     def calculate_result_code(self):

Cython/Compiler/Lexicon.py

@@ -73,7 +73,7 @@ def make_lexicon():
     deco = Str("@")
     bra = Any("([{")
     ket = Any(")]}")
-    punct = Any(":,;+-*/|&<>=.%`~^?")
+    punct = Any(":,;+-*/|&<>=.%`~^?!")
     diphthong = Str("==", "<>", "!=", "<=", ">=", "<<", ">>", "**", "//",
                     "+=", "-=", "*=", "/=", "%=", "|=", "^=", "&=",
                     "<<=", ">>=", "**=", "//=", "->")

Cython/Compiler/Parsing.py

@@ -2297,7 +2297,7 @@ supported_overloaded_operators = set([
     '+', '-', '*', '/', '%',
     '++', '--', '~', '|', '&', '^', '<<', '>>', ',',
     '==', '!=', '>=', '>', '<=', '<',
-    '[]', '()',
+    '[]', '()', '!',
 ])
 
 def p_c_simple_declarator(s, ctx, empty, is_type, cmethod_flag,

docs/src/userguide/wrapping_CPlusPlus.rst

@@ -337,9 +337,9 @@ syntax as C++. Cython provides functions replacing these operators in
 a special module ``cython.operator``. The functions provided are:
 
 * ``cython.operator.dereference`` for dereferencing. ``dereference(foo)``
-  will produce the C++ code ``*foo``
+  will produce the C++ code ``*(foo)``
 * ``cython.operator.preincrement`` for pre-incrementation. ``preincrement(foo)``
-  will produce the C++ code ``++foo``
+  will produce the C++ code ``++(foo)``
 * ...
 
 These functions need to be cimported. Of course, one can use a

tests/run/cpp_operators.pyx

@@ -13,6 +13,7 @@ cdef extern from "cpp_operators_helper.h":
         char* operator-()
         char* operator*()
         char* operator~()
+        char* operator!()
 
         char* operator++()
         char* operator--()
@@ -50,12 +51,14 @@ def test_unops():
     unary -
     unary ~
     unary *
+    unary !
     """
     cdef TestOps* t = new TestOps()
     out(+t[0])
     out(-t[0])
     out(~t[0])
     out(deref(t[0]))
+    out(not t[0])
     del t
 
 def test_incdec():