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# Copyright David Abrahams 2004. Distributed under the Boost
# Software License, Version 1.0. (See accompanying
# file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
'''
>>> from extract_ext import *
Just about anything has a truth value in Python
>>> assert check_bool(None)
>>> extract_bool(None)
0
>>> assert check_bool(2)
>>> extract_bool(2)
1
>>> assert not check_bool('')
Check that object manager types work properly. These are a different
case because they wrap Python objects instead of being wrapped by them.
>>> assert not check_list(2)
>>> try: x = extract_list(2)
... except TypeError as x:
... if str(x) != 'Expecting an object of type list; got an object of type int instead':
... print(x)
... else:
... print('expected an exception, got', x, 'instead')
Can't extract a list from a tuple. Use list(x) to convert a sequence
to a list:
>>> assert not check_list((1, 2, 3))
>>> assert check_list([1, 2, 3])
>>> extract_list([1, 2, 3])
[1, 2, 3]
Can get a char const* from a Python string:
>>> assert check_cstring('hello')
>>> extract_cstring('hello')
'hello'
Can't get a char const* from a Python int:
>>> assert not check_cstring(1)
>>> try: x = extract_cstring(1)
... except TypeError: pass
... else:
... print('expected an exception, got', x, 'instead')
Extract an std::string (class) rvalue from a native Python type
>>> assert check_string('hello')
>>> extract_string('hello')
'hello'
Constant references are not treated as rvalues for the purposes of
extract:
>>> assert not check_string_cref('hello')
We can extract lvalues where appropriate:
>>> x = X(42)
>>> check_X(x)
1
>>> extract_X(x)
X(42)
>>> check_X_ptr(x)
1
>>> extract_X_ptr(x)
X(42)
>>> extract_X_ref(x)
X(42)
Demonstrate that double-extraction of an rvalue works, and all created
copies of the object are destroyed:
>>> n = count_Xs()
>>> double_X(333)
666
>>> count_Xs() - n
0
General check for cleanliness:
>>> del x
>>> count_Xs()
0
'''
def run(args = None):
import sys
import doctest
if args is not None:
sys.argv = args
return doctest.testmod(sys.modules.get(__name__))
if __name__ == '__main__':
print("running...")
import sys
status = run()[0]
if (status == 0): print("Done.")
sys.exit(status)
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