Namespace

ns1 = CNamespace('ns1')
ns2 = CNamespace('ns2', in_space=ns1)

# Declare that function is on this namespace
fun = CFunction(name='my_fun', in_space=ns2)

# When doing the definition, typically is done indicating namespace inline
print(fun.define().render())

void ns1::ns2::my_fun(void)
{

}

# On the declaration it can have the same format
print(fun.declare().render())

void 
ns1::ns2::my_fun(void);

# But typically the namespace is indicated with a namespace section,
# So we can omit inline namespace by saying that we are on a namespace
print(fun.declare(from_space=ns1).render())

void 
ns2::my_fun(void);

print(fun.declare(from_space=ns2).render())

void 
my_fun(void);