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from multipledispatch import dispatch
from multipledispatch.utils import raises
from functools import partial
test_namespace = dict()
orig_dispatch = dispatch
dispatch = partial(dispatch, namespace=test_namespace)
def test_singledispatch():
@dispatch(int)
def f(x):
return x + 1
@dispatch(int)
def g(x):
return x + 2
@dispatch(float)
def f(x):
return x - 1
assert f(1) == 2
assert g(1) == 3
assert f(1.0) == 0
assert raises(NotImplementedError, lambda: f("hello"))
def test_multipledispatch(benchmark):
@dispatch(int, int)
def f(x, y):
return x + y
@dispatch(float, float)
def f(x, y):
return x - y
assert f(1, 2) == 3
assert f(1.0, 2.0) == -1.0
class A(object):
pass
class B(object):
pass
class C(A):
pass
class D(C):
pass
class E(C):
pass
def test_inheritance():
@dispatch(A)
def f(x):
return "a"
@dispatch(B)
def f(x):
return "b"
assert f(A()) == "a"
assert f(B()) == "b"
assert f(C()) == "a"
def test_inheritance_and_multiple_dispatch():
@dispatch(A, A)
def f(x, y):
return type(x), type(y)
@dispatch(A, B)
def f(x, y):
return 0
assert f(A(), A()) == (A, A)
assert f(A(), C()) == (A, C)
assert f(A(), B()) == 0
assert f(C(), B()) == 0
assert raises(NotImplementedError, lambda: f(B(), B()))
def test_competing_solutions():
@dispatch(A)
def h(x):
return 1
@dispatch(C)
def h(x):
return 2
assert h(D()) == 2
def test_competing_multiple():
@dispatch(A, B)
def h(x, y):
return 1
@dispatch(C, B)
def h(x, y):
return 2
assert h(D(), B()) == 2
def test_competing_ambiguous():
@dispatch(A, C)
def f(x, y):
return 2
@dispatch(C, A)
def f(x, y):
return 2
assert f(A(), C()) == f(C(), A()) == 2
# assert raises(Warning, lambda : f(C(), C()))
def test_caching_correct_behavior():
@dispatch(A)
def f(x):
return 1
assert f(C()) == 1
@dispatch(C)
def f(x):
return 2
assert f(C()) == 2
def test_union_types():
@dispatch((A, C))
def f(x):
return 1
assert f(A()) == 1
assert f(C()) == 1
def test_namespaces():
ns1 = dict()
ns2 = dict()
def foo(x):
return 1
foo1 = orig_dispatch(int, namespace=ns1)(foo)
def foo(x):
return 2
foo2 = orig_dispatch(int, namespace=ns2)(foo)
assert foo1(0) == 1
assert foo2(0) == 2
"""
Fails
def test_dispatch_on_dispatch():
@dispatch(A)
@dispatch(C)
def q(x):
return 1
assert q(A()) == 1
assert q(C()) == 1
"""
def test_methods():
class Foo(object):
@dispatch(float)
def f(self, x):
return x - 1
@dispatch(int)
def f(self, x):
return x + 1
@dispatch(int)
def g(self, x):
return x + 3
foo = Foo()
assert foo.f(1) == 2
assert foo.f(1.0) == 0.0
assert foo.g(1) == 4
def test_methods_multiple_dispatch():
class Foo(object):
@dispatch(A, A)
def f(x, y):
return 1
@dispatch(A, C)
def f(x, y):
return 2
foo = Foo()
assert foo.f(A(), A()) == 1
assert foo.f(A(), C()) == 2
assert foo.f(C(), C()) == 2
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