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# tag: cpp
cimport cython
from cython.operator import dereference as deref
cdef extern from "cpp_templates_helper.h":
cdef cppclass Wrap[T, AltType=*, UndeclarableAltType=*]:
Wrap(T)
void set(T)
T get()
bint operator==(Wrap[T])
AltType get_alt_type()
void set_alt_type(AltType)
UndeclarableAltType create()
bint accept(UndeclarableAltType)
cdef cppclass Pair[T1,T2]:
Pair(T1,T2)
T1 first()
T2 second()
bint operator==(Pair[T1,T2])
bint operator!=(Pair[T1,T2])
cdef cppclass SuperClass[T1, T2]:
pass
cdef cppclass SubClass[T2, T3](SuperClass[T2, T3]):
pass
cdef cppclass Div[T]:
@staticmethod
T half(T value)
def test_int(int x, int y):
"""
>>> test_int(3, 4)
(3, 4, False)
>>> test_int(100, 100)
(100, 100, True)
"""
try:
a = new Wrap[int](x)
b = new Wrap[int](0)
b.set(y)
return a.get(), b.get(), a[0] == b[0]
finally:
del a, b
def test_double(double x, double y):
"""
>>> test_double(3, 3.5)
(3.0, 3.5, False)
>>> test_double(100, 100)
(100.0, 100.0, True)
"""
try:
a = new Wrap[double](x)
b = new Wrap[double](-1)
b.set(y)
return a.get(), b.get(), deref(a) == deref(b)
finally:
del a, b
def test_default_template_arguments(double x):
"""
>>> test_default_template_arguments(3.5)
(3.5, 3.0)
"""
try:
a = new Wrap[double](x)
b = new Wrap[double, int, long](x)
ax = a.get_alt_type()
a.set_alt_type(ax)
assert a.accept(a.create()) # never declared
bx = b.get_alt_type()
b.set_alt_type(bx)
bc = b.create() # declaration here is fine
assert b.accept(bc)
return a.get(), b.get()
finally:
del a
def test_pair(int i, double x):
"""
>>> test_pair(1, 1.5)
(1, 1.5, True, False)
>>> test_pair(2, 2.25)
(2, 2.25, True, False)
"""
try:
pair = new Pair[int, double](i, x)
return pair.first(), pair.second(), deref(pair) == deref(pair), deref(pair) != deref(pair)
finally:
del pair
def test_ptr(int i):
"""
>>> test_ptr(3)
3
>>> test_ptr(5)
5
"""
try:
w = new Wrap[int*](&i)
return deref(w.get())
finally:
del w
cdef double f(double x):
return x*x
def test_func_ptr(double x):
"""
>>> test_func_ptr(3)
9.0
>>> test_func_ptr(-1.5)
2.25
"""
try:
w = new Wrap[double (*)(double)](&f)
return w.get()(x)
finally:
del w
def test_typeof(double x):
"""
>>> test_func_ptr(3)
9.0
>>> test_func_ptr(-1.5)
2.25
"""
try:
w = new Wrap[cython.typeof(&f)](&f)
return w.get()(x)
finally:
del w
def test_cast_template_pointer():
"""
>>> test_cast_template_pointer()
"""
cdef SubClass[int, float] *sub = new SubClass[int, float]()
cdef SuperClass[int, float] *sup
sup = sub
sup = <SubClass[int, float] *> sub
def test_static(x):
"""
>>> test_static(2)
(1, 1.0)
>>> test_static(3)
(1, 1.5)
"""
return Div[int].half(x), Div[double].half(x)
def test_pure_syntax(int i):
"""
>>> test_ptr(3)
3
>>> test_ptr(5)
5
"""
try:
w = new Wrap[cython.pointer(int)](&i)
return deref(w.get())
finally:
del w
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