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Add py::dict() keyword constructor

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This commit is contained in:
Dean Moldovan 2016-08-30 12:05:53 +02:00
parent 66aa2728f4
commit 15a112f8ff
5 changed files with 26 additions and 16 deletions
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4
include/pybind11/cast.h
View File

@ -1148,6 +1148,10 @@ inline object handle::operator()(detail::args_proxy args, detail::kwargs_proxy k
return result;
}
template <typename... Args, typename /*SFINAE*/>
dict::dict(Args &&...args)
: dict(detail::unpacking_collector<>(std::forward<Args>(args)...).kwargs()) { }
#define PYBIND11_MAKE_OPAQUE(Type) \
namespace pybind11 { namespace detail { \
template<> class type_caster<Type> : public type_caster_base<Type> { }; \

3
include/pybind11/pytypes.h
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@ -589,6 +589,9 @@ public:
dict() : object(PyDict_New(), false) {
if (!m_ptr) pybind11_fail("Could not allocate dict object!");
}
template <typename... Args,
typename = detail::enable_if_t<detail::all_of_t<detail::is_keyword_or_ds, Args...>::value>>
dict(Args &&...args);
size_t size() const { return (size_t) PyDict_Size(m_ptr); }
detail::dict_iterator begin() const { return (++detail::dict_iterator(*this, 0)); }
detail::dict_iterator end() const { return detail::dict_iterator(); }

23
tests/test_callbacks.cpp
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@ -89,12 +89,9 @@ test_initializer callbacks([](py::module &m) {
});
m.def("test_dict_unpacking", [](py::function f) {
auto d1 = py::dict();
d1["key"] = py::cast("value");
d1["a"] = py::cast(1);
auto d1 = py::dict("key"_a="value", "a"_a=1);
auto d2 = py::dict();
auto d3 = py::dict();
d3["b"] = py::cast(2);
auto d3 = py::dict("b"_a=2);
return f("positional", 1, **d1, **d2, **d3);
});
@ -104,30 +101,24 @@ test_initializer callbacks([](py::module &m) {
m.def("test_unpacking_and_keywords1", [](py::function f) {
auto args = py::make_tuple(2);
auto kwargs = py::dict();
kwargs["d"] = py::cast(4);
auto kwargs = py::dict("d"_a=4);
return f(1, *args, "c"_a=3, **kwargs);
});
m.def("test_unpacking_and_keywords2", [](py::function f) {
auto kwargs1 = py::dict();
kwargs1["a"] = py::cast(1);
auto kwargs2 = py::dict();
kwargs2["c"] = py::cast(3);
kwargs2["d"] = py::cast(4);
auto kwargs1 = py::dict("a"_a=1);
auto kwargs2 = py::dict("c"_a=3, "d"_a=4);
return f("positional", *py::make_tuple(1), 2, *py::make_tuple(3, 4), 5,
"key"_a="value", **kwargs1, "b"_a=2, **kwargs2, "e"_a=5);
});
m.def("test_unpacking_error1", [](py::function f) {
auto kwargs = py::dict();
kwargs["x"] = py::cast(3);
auto kwargs = py::dict("x"_a=3);
return f("x"_a=1, "y"_a=2, **kwargs); // duplicate ** after keyword
});
m.def("test_unpacking_error2", [](py::function f) {
auto kwargs = py::dict();
kwargs["x"] = py::cast(3);
auto kwargs = py::dict("x"_a=3);
return f(**kwargs, "x"_a=1); // duplicate keyword after **
});

6
tests/test_python_types.cpp
View File

@ -219,4 +219,10 @@ test_initializer python_types([](py::module &m) {
auto s2 = "{a} + {b} = {c}"_s.format("a"_a=1, "b"_a=2, "c"_a=3);
return py::make_tuple(s1, s2);
});
m.def("test_dict_keyword_constructor", []() {
auto d1 = py::dict("x"_a=1, "y"_a=2);
auto d2 = py::dict("z"_a=3, **d1);
return d2;
});
});

6
tests/test_python_types.py
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@ -242,3 +242,9 @@ def test_str_api():
s1, s2 = test_str_format()
assert s1 == "1 + 2 = 3"
assert s1 == s2
def test_dict_api():
from pybind11_tests import test_dict_keyword_constructor
assert test_dict_keyword_constructor() == {"x": 1, "y": 2, "z": 3}