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Create sequences using initializer list #2451

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Create sequences using initializer list #2451

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593047e
pybind11::tuple and pybind11::list can be constructed using a
Sep 1, 2020
586b9e5
Test initializer-list based constructors for tuple and list
Sep 1, 2020
8e33d26
Test case creates a tuple and a list with mixed datatypes using
Sep 2, 2020
c9ac962
Refactored test_pytypes to account for #2451 suggestions.
Sep 2, 2020
81128c8
Work in progress extension of the initializer-list initialization
Sep 3, 2020
4d8df0d
Expanded the initializer_list constructor for tuple, list and set tests
Sep 3, 2020
bb3dfc1
Removed useless include.
Sep 3, 2020
d2b21d6
Added double-line separator as per flake complaints.
Sep 3, 2020
c6665f2
Added round braces in subobject initialization (clang warning).
Sep 3, 2020
5a943d8
tuple, list and set have a new std::initializer_list<pybind11::object>
Oct 8, 2020
27eeb99
Test that tuple, list and set std::initializer_list<pybind11::object>
Oct 8, 2020
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11 changes: 11 additions & 0 deletions include/pybind11/pytypes.h
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@

#include "detail/common.h"
#include "buffer_info.h"
#include <initializer_list>
#include <utility>
#include <type_traits>

Expand Down Expand Up @@ -1216,6 +1217,11 @@ class tuple : public object {
explicit tuple(size_t size = 0) : object(PyTuple_New((ssize_t) size), stolen_t{}) {
if (!m_ptr) pybind11_fail("Could not allocate tuple object!");
}
explicit tuple(std::initializer_list<object> init_list) : tuple(init_list.size()) {
size_t index {0};
for (const pybind11::object& item : init_list)
detail::tuple_accessor(*this, index++) = item;
}
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With this, we could think about deprecating setting elements of a tuple, since tuples are supposed to be immutable once constructed?

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Makes sense to me.

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Nothing for this PR ofc :-)

size_t size() const { return (size_t) PyTuple_Size(m_ptr); }
bool empty() const { return size() == 0; }
detail::tuple_accessor operator[](size_t index) const { return {*this, index}; }
Expand Down Expand Up @@ -1276,6 +1282,11 @@ class list : public object {
explicit list(size_t size = 0) : object(PyList_New((ssize_t) size), stolen_t{}) {
if (!m_ptr) pybind11_fail("Could not allocate list object!");
}
explicit list(std::initializer_list<object> init_list) : list(init_list.size()) {
size_t index {0};
for (const pybind11::object& item : init_list)
detail::list_accessor(*this, index++) = item;
}
size_t size() const { return (size_t) PyList_Size(m_ptr); }
bool empty() const { return size() == 0; }
detail::list_accessor operator[](size_t index) const { return {*this, index}; }
Expand Down
10 changes: 10 additions & 0 deletions tests/test_pytypes.cpp
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Expand Up @@ -237,6 +237,16 @@ TEST_SUBMODULE(pytypes, m) {
);
});

// Tuples and lists can also be constructed using an initializer list of pybind11::object subclasses
m.def("initializer_list", []() {
return py::dict(
"tuple_ints"_a = py::tuple({py::int_(1), py::int_(2), py::int_(3)}),
"tuple_floats"_a = py::tuple({py::float_(2.2), py::float_(3.1), py::float_(4.5), py::float_(5.4)}),
"list_ints"_a = py::list({py::int_(1), py::int_(2), py::int_(3)}),
"list_floats"_a = py::list({py::float_(2.2), py::float_(3.1), py::float_(4.5), py::float_(5.4)})
);
});

m.def("convert_to_pybind11_str", [](py::object o) { return py::str(o); });

m.def("get_implicit_casting", []() {
Expand Down
20 changes: 20 additions & 0 deletions tests/test_pytypes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -221,6 +221,26 @@ def test_constructors():
for k in noconv2:
assert noconv2[k] is expected[k]

init_list = m.initializer_list()
expected = ("tuple_ints", tuple), ("list_ints", list)
for key, type_ in expected:
ints = init_list[key]
assert(isinstance(ints, type_))
assert(len(ints) == 3)
assert(ints[0] == 1)
assert(ints[1] == 2)
assert(ints[2] == 3)

expected = ("tuple_floats", tuple), ("list_floats", list)
for key, type_ in expected:
floats = init_list[key]
assert(isinstance(floats, type_))
assert(len(floats) == 4)
assert(floats[0] == 2.2)
assert(floats[1] == 3.1)
assert(floats[2] == 4.5)
assert(floats[3] == 5.4)


def test_pybind11_str_raw_str():
# specifically to exercise pybind11::str::raw_str
Expand Down