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fix: do not set docstring for function when empty (#2745)

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* Do not set docstring for function when it's empty

* No need to check pointer for `free`

* Use ternary operator to conditionally set `ml_doc`
This commit is contained in:
Qifan Lu 2020-12-27 19:56:30 -08:00 committed by GitHub
parent 830f8eda87
commit d587a2fd17
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3 changed files with 14 additions and 3 deletions
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4
include/pybind11/pybind11.h
View File

@ -439,9 +439,9 @@ protected:
/* Install docstring */
auto *func = (PyCFunctionObject *) m_ptr;
if (func->m_ml->ml_doc)
std::free(const_cast<char *>(func->m_ml->ml_doc));
func->m_ml->ml_doc = strdup(signatures.c_str());
// Install docstring if it's non-empty (when at least one option is enabled)
func->m_ml->ml_doc = signatures.empty() ? nullptr : strdup(signatures.c_str());
if (rec->is_method) {
m_ptr = PYBIND11_INSTANCE_METHOD_NEW(m_ptr, rec->scope.ptr());

8
tests/test_docstring_options.cpp
View File

@ -45,6 +45,14 @@ TEST_SUBMODULE(docstring_options, m) {
m.def("test_function7", [](int, int) {}, py::arg("a"), py::arg("b"), "A custom docstring");
{
py::options options;
options.disable_user_defined_docstrings();
options.disable_function_signatures();
m.def("test_function8", []() {});
}
{
py::options options;
options.disable_user_defined_docstrings();

3
tests/test_docstring_options.py
View File

@ -34,6 +34,9 @@ def test_docstring_options():
assert m.test_function7.__doc__.startswith("test_function7(a: int, b: int) -> None")
assert m.test_function7.__doc__.endswith("A custom docstring\n")
# when all options are disabled, no docstring (instead of an empty one) should be generated
assert m.test_function8.__doc__ is None
# Suppression of user-defined docstrings for non-function objects
assert not m.DocstringTestFoo.__doc__
assert not m.DocstringTestFoo.value_prop.__doc__