Implement `CEnumType` as suggested by @abergeron .

theano/gof/__init__.py

@@ -55,7 +55,7 @@ from theano.gof.link import \
 from theano.gof.op import \
     Op, OpenMPOp, PureOp, COp, ops_with_inner_function
 
-from theano.gof.type import EnumType, EnumList
+from theano.gof.type import EnumType, EnumList, CEnumType
 
 from theano.gof.opt import (
     Optimizer,

theano/gof/tests/test_types.py

@@ -4,7 +4,7 @@ import numpy as np
 import theano
 from theano import Op, Apply, scalar
 from theano.tensor import TensorType
-from theano.gof.type import CDataType, EnumType, EnumList
+from theano.gof.type import CDataType, EnumType, EnumList, CEnumType
 
 from nose.plugins.skip import SkipTest
 
@@ -80,7 +80,7 @@ def test_cdata():
 
 class TestOpEnumList(Op):
     __props__ = ('op_chosen',)
-    params_type = EnumList('ADD', 'SUB', 'MULTIPLY', 'DIVIDE')
+    params_type = EnumList('ADD', 'SUB', 'MULTIPLY', 'DIVIDE', ctype='unsigned long long')
 
     def __init__(self, choose_op):
         assert self.params_type.ADD == 0
@@ -109,12 +109,15 @@ class TestOpEnumList(Op):
         elif op == self.params_type.MULTIPLY:
             o[0] = a * b
         elif op == self.params_type.DIVIDE:
+            if any(dtype in theano.tensor.continuous_dtypes for dtype in (a.dtype, b.dtype)):
                 o[0] = a / b
+            else:
+                o[0] = a // b
         else:
             raise NotImplementedError('Unknown op id ' + str(op))
 
     def c_code_cache_version(self):
-        return (1,)
+        return None
 
     def c_code(self, node, name, inputs, outputs, sub):
         a, b = inputs
@@ -142,7 +145,48 @@ class TestOpEnumList(Op):
         """ % locals()
 
 
-def test_enum():
+class TestOpCEnumType(Op):
+    __props__ = ('ctype_index',)
+    params_type = CEnumType('SIZE_INT', 'SIZE_FLOAT', 'SIZE_LONG_LONG', ctype='size_t')
+
+    # Just for testing, we define our own macros.
+    def c_support_code(self):
+        return """
+        #define SIZE_INT sizeof(int)
+        #define SIZE_FLOAT sizeof(float)
+        #define SIZE_LONG_LONG sizeof(long long)
+        """
+
+    def __init__(self, ctype):
+        # As we see, Python values of constants are not related to real C values
+        # (sizeof(int) will never be 0).
+        assert self.params_type.SIZE_INT == 0
+        assert self.params_type.SIZE_FLOAT == 1
+        assert self.params_type.SIZE_LONG_LONG == 2
+        d = {'int': self.params_type.SIZE_INT,
+             'float': self.params_type.SIZE_FLOAT,
+             'long long': self.params_type.SIZE_LONG_LONG}
+        self.ctype_index = d[ctype]
+
+    def get_params(self, node):
+        return self.ctype_index
+
+    def make_node(self):
+        return Apply(self, [], [scalar.uint32()])
+
+    def c_code_cache_version(self):
+        return None
+
+    def c_code(self, node, name, inputs, outputs, sub):
+        o, =  outputs
+        ctype_index = sub['params']
+        return """
+        /* ctype_index already contains expected C constant value. */
+        %(o)s = %(ctype_index)s;
+        """ % locals()
+
+
+def test_enum_class():
     # Check that invalid enum name raises exception.
     for invalid_name in ('a', '_A', '0'):
         try:
@@ -174,6 +218,8 @@ def test_enum():
     assert not (e1 != e2)
     assert hash(e1) == hash(e2)
 
+
+def test_op_with_enumlist():
     # Test an op with EnumList.
     a = scalar.int32()
     b = scalar.int32()
@@ -184,10 +230,15 @@ def test_enum():
     f = theano.function([a, b], [c_add, c_sub, c_multiply, c_divide])
     va = 12
     vb = 15
-    ref_add = va + vb
-    ref_sub = va - vb
-    ref_multiply = va * vb
-    ref_divide = va // vb
-    ref = [ref_add, ref_sub, ref_multiply, ref_divide]
+    ref = [va + vb, va - vb, va * vb, va // vb]
     out = f(va, vb)
     assert ref == out, (ref, out)
+
+
+def test_op_with_cenumtype():
+    sizeof_int = TestOpCEnumType('int')()
+    sizeof_float = TestOpCEnumType('float')()
+    sizeof_long_long = TestOpCEnumType('long long')()
+    f = theano.function([], [sizeof_int, sizeof_float, sizeof_long_long])
+    out = f()
+    print('(sizeof(int): ', out[0], ', sizeof(float): ', out[1], ', sizeof(long long): ', out[2], ') ', sep='', end='')