python/test/extract.py at python313 · boostorg/python · GitHub

History

107 lines (81 loc) · 2.45 KB

Raw

100

101

102

103

104

105

106

107

# 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)

>>> assert check_bool(2)

>>> extract_bool(2)

>>> 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)

>>> extract_X(x)

X(42)

>>> check_X_ptr(x)

>>> 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

General check for cleanliness:

>>> del x

>>> count_Xs()

'''

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)

python/test/extract.py at python313 · boostorg/python · GitHub

Uh oh!

Expand file tree

Breadcrumbs

extract.py

Latest commit

History

Breadcrumbs

extract.py

File metadata and controls