mirror of
https://github.com/pybind/pybind11.git
synced 2024-11-22 13:15:12 +00:00
354 lines
13 KiB
C++
354 lines
13 KiB
C++
/*
|
|
tests/test_sequences_and_iterators.cpp -- supporting Pythons' sequence protocol, iterators,
|
|
etc.
|
|
|
|
Copyright (c) 2016 Wenzel Jakob <wenzel.jakob@epfl.ch>
|
|
|
|
All rights reserved. Use of this source code is governed by a
|
|
BSD-style license that can be found in the LICENSE file.
|
|
*/
|
|
|
|
#include "pybind11_tests.h"
|
|
#include "constructor_stats.h"
|
|
#include <pybind11/operators.h>
|
|
#include <pybind11/stl.h>
|
|
|
|
template<typename T>
|
|
class NonZeroIterator {
|
|
const T* ptr_;
|
|
public:
|
|
NonZeroIterator(const T* ptr) : ptr_(ptr) {}
|
|
const T& operator*() const { return *ptr_; }
|
|
NonZeroIterator& operator++() { ++ptr_; return *this; }
|
|
};
|
|
|
|
class NonZeroSentinel {};
|
|
|
|
template<typename A, typename B>
|
|
bool operator==(const NonZeroIterator<std::pair<A, B>>& it, const NonZeroSentinel&) {
|
|
return !(*it).first || !(*it).second;
|
|
}
|
|
|
|
template <typename PythonType>
|
|
py::list test_random_access_iterator(PythonType x) {
|
|
if (x.size() < 5)
|
|
throw py::value_error("Please provide at least 5 elements for testing.");
|
|
|
|
auto checks = py::list();
|
|
auto assert_equal = [&checks](py::handle a, py::handle b) {
|
|
auto result = PyObject_RichCompareBool(a.ptr(), b.ptr(), Py_EQ);
|
|
if (result == -1) { throw py::error_already_set(); }
|
|
checks.append(result != 0);
|
|
};
|
|
|
|
auto it = x.begin();
|
|
assert_equal(x[0], *it);
|
|
assert_equal(x[0], it[0]);
|
|
assert_equal(x[1], it[1]);
|
|
|
|
assert_equal(x[1], *(++it));
|
|
assert_equal(x[1], *(it++));
|
|
assert_equal(x[2], *it);
|
|
assert_equal(x[3], *(it += 1));
|
|
assert_equal(x[2], *(--it));
|
|
assert_equal(x[2], *(it--));
|
|
assert_equal(x[1], *it);
|
|
assert_equal(x[0], *(it -= 1));
|
|
|
|
assert_equal(it->attr("real"), x[0].attr("real"));
|
|
assert_equal((it + 1)->attr("real"), x[1].attr("real"));
|
|
|
|
assert_equal(x[1], *(it + 1));
|
|
assert_equal(x[1], *(1 + it));
|
|
it += 3;
|
|
assert_equal(x[1], *(it - 2));
|
|
|
|
checks.append(static_cast<std::size_t>(x.end() - x.begin()) == x.size());
|
|
checks.append((x.begin() + static_cast<std::ptrdiff_t>(x.size())) == x.end());
|
|
checks.append(x.begin() < x.end());
|
|
|
|
return checks;
|
|
}
|
|
|
|
TEST_SUBMODULE(sequences_and_iterators, m) {
|
|
// test_sliceable
|
|
class Sliceable{
|
|
public:
|
|
Sliceable(int n): size(n) {}
|
|
int start,stop,step;
|
|
int size;
|
|
};
|
|
py::class_<Sliceable>(m,"Sliceable")
|
|
.def(py::init<int>())
|
|
.def("__getitem__",[](const Sliceable &s, py::slice slice) {
|
|
ssize_t start, stop, step, slicelength;
|
|
if (!slice.compute(s.size, &start, &stop, &step, &slicelength))
|
|
throw py::error_already_set();
|
|
int istart = static_cast<int>(start);
|
|
int istop = static_cast<int>(stop);
|
|
int istep = static_cast<int>(step);
|
|
return std::make_tuple(istart,istop,istep);
|
|
})
|
|
;
|
|
|
|
// test_sequence
|
|
class Sequence {
|
|
public:
|
|
Sequence(size_t size) : m_size(size) {
|
|
print_created(this, "of size", m_size);
|
|
m_data = new float[size];
|
|
memset(m_data, 0, sizeof(float) * size);
|
|
}
|
|
Sequence(const std::vector<float> &value) : m_size(value.size()) {
|
|
print_created(this, "of size", m_size, "from std::vector");
|
|
m_data = new float[m_size];
|
|
memcpy(m_data, &value[0], sizeof(float) * m_size);
|
|
}
|
|
Sequence(const Sequence &s) : m_size(s.m_size) {
|
|
print_copy_created(this);
|
|
m_data = new float[m_size];
|
|
memcpy(m_data, s.m_data, sizeof(float)*m_size);
|
|
}
|
|
Sequence(Sequence &&s) : m_size(s.m_size), m_data(s.m_data) {
|
|
print_move_created(this);
|
|
s.m_size = 0;
|
|
s.m_data = nullptr;
|
|
}
|
|
|
|
~Sequence() { print_destroyed(this); delete[] m_data; }
|
|
|
|
Sequence &operator=(const Sequence &s) {
|
|
if (&s != this) {
|
|
delete[] m_data;
|
|
m_size = s.m_size;
|
|
m_data = new float[m_size];
|
|
memcpy(m_data, s.m_data, sizeof(float)*m_size);
|
|
}
|
|
print_copy_assigned(this);
|
|
return *this;
|
|
}
|
|
|
|
Sequence &operator=(Sequence &&s) {
|
|
if (&s != this) {
|
|
delete[] m_data;
|
|
m_size = s.m_size;
|
|
m_data = s.m_data;
|
|
s.m_size = 0;
|
|
s.m_data = nullptr;
|
|
}
|
|
print_move_assigned(this);
|
|
return *this;
|
|
}
|
|
|
|
bool operator==(const Sequence &s) const {
|
|
if (m_size != s.size()) return false;
|
|
for (size_t i = 0; i < m_size; ++i)
|
|
if (m_data[i] != s[i])
|
|
return false;
|
|
return true;
|
|
}
|
|
bool operator!=(const Sequence &s) const { return !operator==(s); }
|
|
|
|
float operator[](size_t index) const { return m_data[index]; }
|
|
float &operator[](size_t index) { return m_data[index]; }
|
|
|
|
bool contains(float v) const {
|
|
for (size_t i = 0; i < m_size; ++i)
|
|
if (v == m_data[i])
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
Sequence reversed() const {
|
|
Sequence result(m_size);
|
|
for (size_t i = 0; i < m_size; ++i)
|
|
result[m_size - i - 1] = m_data[i];
|
|
return result;
|
|
}
|
|
|
|
size_t size() const { return m_size; }
|
|
|
|
const float *begin() const { return m_data; }
|
|
const float *end() const { return m_data+m_size; }
|
|
|
|
private:
|
|
size_t m_size;
|
|
float *m_data;
|
|
};
|
|
py::class_<Sequence>(m, "Sequence")
|
|
.def(py::init<size_t>())
|
|
.def(py::init<const std::vector<float>&>())
|
|
/// Bare bones interface
|
|
.def("__getitem__", [](const Sequence &s, size_t i) {
|
|
if (i >= s.size()) throw py::index_error();
|
|
return s[i];
|
|
})
|
|
.def("__setitem__", [](Sequence &s, size_t i, float v) {
|
|
if (i >= s.size()) throw py::index_error();
|
|
s[i] = v;
|
|
})
|
|
.def("__len__", &Sequence::size)
|
|
/// Optional sequence protocol operations
|
|
.def("__iter__", [](const Sequence &s) { return py::make_iterator(s.begin(), s.end()); },
|
|
py::keep_alive<0, 1>() /* Essential: keep object alive while iterator exists */)
|
|
.def("__contains__", [](const Sequence &s, float v) { return s.contains(v); })
|
|
.def("__reversed__", [](const Sequence &s) -> Sequence { return s.reversed(); })
|
|
/// Slicing protocol (optional)
|
|
.def("__getitem__", [](const Sequence &s, py::slice slice) -> Sequence* {
|
|
size_t start, stop, step, slicelength;
|
|
if (!slice.compute(s.size(), &start, &stop, &step, &slicelength))
|
|
throw py::error_already_set();
|
|
Sequence *seq = new Sequence(slicelength);
|
|
for (size_t i = 0; i < slicelength; ++i) {
|
|
(*seq)[i] = s[start]; start += step;
|
|
}
|
|
return seq;
|
|
})
|
|
.def("__setitem__", [](Sequence &s, py::slice slice, const Sequence &value) {
|
|
size_t start, stop, step, slicelength;
|
|
if (!slice.compute(s.size(), &start, &stop, &step, &slicelength))
|
|
throw py::error_already_set();
|
|
if (slicelength != value.size())
|
|
throw std::runtime_error("Left and right hand size of slice assignment have different sizes!");
|
|
for (size_t i = 0; i < slicelength; ++i) {
|
|
s[start] = value[i]; start += step;
|
|
}
|
|
})
|
|
/// Comparisons
|
|
.def(py::self == py::self)
|
|
.def(py::self != py::self)
|
|
// Could also define py::self + py::self for concatenation, etc.
|
|
;
|
|
|
|
// test_map_iterator
|
|
// Interface of a map-like object that isn't (directly) an unordered_map, but provides some basic
|
|
// map-like functionality.
|
|
class StringMap {
|
|
public:
|
|
StringMap() = default;
|
|
StringMap(std::unordered_map<std::string, std::string> init)
|
|
: map(std::move(init)) {}
|
|
|
|
void set(std::string key, std::string val) { map[key] = val; }
|
|
std::string get(std::string key) const { return map.at(key); }
|
|
size_t size() const { return map.size(); }
|
|
private:
|
|
std::unordered_map<std::string, std::string> map;
|
|
public:
|
|
decltype(map.cbegin()) begin() const { return map.cbegin(); }
|
|
decltype(map.cend()) end() const { return map.cend(); }
|
|
};
|
|
py::class_<StringMap>(m, "StringMap")
|
|
.def(py::init<>())
|
|
.def(py::init<std::unordered_map<std::string, std::string>>())
|
|
.def("__getitem__", [](const StringMap &map, std::string key) {
|
|
try { return map.get(key); }
|
|
catch (const std::out_of_range&) {
|
|
throw py::key_error("key '" + key + "' does not exist");
|
|
}
|
|
})
|
|
.def("__setitem__", &StringMap::set)
|
|
.def("__len__", &StringMap::size)
|
|
.def("__iter__", [](const StringMap &map) { return py::make_key_iterator(map.begin(), map.end()); },
|
|
py::keep_alive<0, 1>())
|
|
.def("items", [](const StringMap &map) { return py::make_iterator(map.begin(), map.end()); },
|
|
py::keep_alive<0, 1>())
|
|
;
|
|
|
|
// test_generalized_iterators
|
|
class IntPairs {
|
|
public:
|
|
IntPairs(std::vector<std::pair<int, int>> data) : data_(std::move(data)) {}
|
|
const std::pair<int, int>* begin() const { return data_.data(); }
|
|
private:
|
|
std::vector<std::pair<int, int>> data_;
|
|
};
|
|
py::class_<IntPairs>(m, "IntPairs")
|
|
.def(py::init<std::vector<std::pair<int, int>>>())
|
|
.def("nonzero", [](const IntPairs& s) {
|
|
return py::make_iterator(NonZeroIterator<std::pair<int, int>>(s.begin()), NonZeroSentinel());
|
|
}, py::keep_alive<0, 1>())
|
|
.def("nonzero_keys", [](const IntPairs& s) {
|
|
return py::make_key_iterator(NonZeroIterator<std::pair<int, int>>(s.begin()), NonZeroSentinel());
|
|
}, py::keep_alive<0, 1>())
|
|
;
|
|
|
|
|
|
#if 0
|
|
// Obsolete: special data structure for exposing custom iterator types to python
|
|
// kept here for illustrative purposes because there might be some use cases which
|
|
// are not covered by the much simpler py::make_iterator
|
|
|
|
struct PySequenceIterator {
|
|
PySequenceIterator(const Sequence &seq, py::object ref) : seq(seq), ref(ref) { }
|
|
|
|
float next() {
|
|
if (index == seq.size())
|
|
throw py::stop_iteration();
|
|
return seq[index++];
|
|
}
|
|
|
|
const Sequence &seq;
|
|
py::object ref; // keep a reference
|
|
size_t index = 0;
|
|
};
|
|
|
|
py::class_<PySequenceIterator>(seq, "Iterator")
|
|
.def("__iter__", [](PySequenceIterator &it) -> PySequenceIterator& { return it; })
|
|
.def("__next__", &PySequenceIterator::next);
|
|
|
|
On the actual Sequence object, the iterator would be constructed as follows:
|
|
.def("__iter__", [](py::object s) { return PySequenceIterator(s.cast<const Sequence &>(), s); })
|
|
#endif
|
|
|
|
// test_python_iterator_in_cpp
|
|
m.def("object_to_list", [](py::object o) {
|
|
auto l = py::list();
|
|
for (auto item : o) {
|
|
l.append(item);
|
|
}
|
|
return l;
|
|
});
|
|
|
|
m.def("iterator_to_list", [](py::iterator it) {
|
|
auto l = py::list();
|
|
while (it != py::iterator::sentinel()) {
|
|
l.append(*it);
|
|
++it;
|
|
}
|
|
return l;
|
|
});
|
|
|
|
// Make sure that py::iterator works with std algorithms
|
|
m.def("count_none", [](py::object o) {
|
|
return std::count_if(o.begin(), o.end(), [](py::handle h) { return h.is_none(); });
|
|
});
|
|
|
|
m.def("find_none", [](py::object o) {
|
|
auto it = std::find_if(o.begin(), o.end(), [](py::handle h) { return h.is_none(); });
|
|
return it->is_none();
|
|
});
|
|
|
|
m.def("count_nonzeros", [](py::dict d) {
|
|
return std::count_if(d.begin(), d.end(), [](std::pair<py::handle, py::handle> p) {
|
|
return p.second.cast<int>() != 0;
|
|
});
|
|
});
|
|
|
|
m.def("tuple_iterator", &test_random_access_iterator<py::tuple>);
|
|
m.def("list_iterator", &test_random_access_iterator<py::list>);
|
|
m.def("sequence_iterator", &test_random_access_iterator<py::sequence>);
|
|
|
|
// test_iterator_passthrough
|
|
// #181: iterator passthrough did not compile
|
|
m.def("iterator_passthrough", [](py::iterator s) -> py::iterator {
|
|
return py::make_iterator(std::begin(s), std::end(s));
|
|
});
|
|
|
|
// test_iterator_rvp
|
|
// #388: Can't make iterators via make_iterator() with different r/v policies
|
|
static std::vector<int> list = { 1, 2, 3 };
|
|
m.def("make_iterator_1", []() { return py::make_iterator<py::return_value_policy::copy>(list); });
|
|
m.def("make_iterator_2", []() { return py::make_iterator<py::return_value_policy::automatic>(list); });
|
|
}
|