mirror of
https://github.com/pybind/pybind11.git
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Refactoring vector_binder so it now a function
This commit is contained in:
Sergey Lyskov
Wenzel Jakob
parent
2de5af998d
commit
9ee4f92b06
@ -20,7 +20,7 @@
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NAMESPACE_BEGIN(pybind11)
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NAMESPACE_BEGIN(detail)
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template<typename T>
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constexpr auto has_equal_operator(int) -> decltype(std::declval<T>() == std::declval<T>(), bool()) { return true; }
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@ -67,200 +67,196 @@ struct has_insertion_operator_s {
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};
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template<typename Vector, typename Class_, typename std::enable_if< std::is_default_constructible<typename Vector::value_type>::value >::type * = nullptr>
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void vector_maybe_default_constructible(Class_ &cl) {
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using size_type = typename Vector::size_type;
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cl.def(pybind11::init<size_type>());
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cl.def("resize", (void (Vector::*)(size_type count)) &Vector::resize, "changes the number of elements stored");
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/// Slicing protocol
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cl.def("__getitem__", [](Vector const &v, pybind11::slice slice) -> Vector * {
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pybind11::ssize_t start, stop, step, slicelength;
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if(!slice.compute(v.size(), &start, &stop, &step, &slicelength))
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throw pybind11::error_already_set();
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Vector *seq = new Vector(slicelength);
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for (int i=0; i<slicelength; ++i) {
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(*seq)[i] = v[start]; start += step;
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}
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return seq;
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});
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}
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template<typename Vector, typename Class_, typename std::enable_if< !std::is_default_constructible<typename Vector::value_type>::value >::type * = nullptr>
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void vector_maybe_default_constructible(Class_ &) {}
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template<typename Vector, typename Class_, typename std::enable_if< std::is_copy_constructible<typename Vector::value_type>::value >::type * = nullptr>
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void vector_maybe_copy_constructible(Class_ &cl) {
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cl.def(pybind11::init< Vector const &>());
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}
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template<typename Vector, typename Class_, typename std::enable_if< !std::is_copy_constructible<typename Vector::value_type>::value >::type * = nullptr>
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void vector_maybe_copy_constructible(Class_ &) {}
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template<typename Vector, typename Class_, typename std::enable_if< has_equal_operator_s<typename Vector::value_type>::value >::type * = nullptr>
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void vector_maybe_has_equal_operator(Class_ &cl) {
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using T = typename Vector::value_type;
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cl.def(pybind11::self == pybind11::self);
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cl.def(pybind11::self != pybind11::self);
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cl.def("count", [](Vector const &v, T const & value) { return std::count(v.begin(), v.end(), value); }, "counts the elements that are equal to value");
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cl.def("remove", [](Vector &v, T const &t) {
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auto p = std::find(v.begin(), v.end(), t);
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if(p != v.end()) v.erase(p);
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else throw pybind11::value_error();
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}, "Remove the first item from the list whose value is x. It is an error if there is no such item.");
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cl.def("__contains__", [](Vector const &v, T const &t) { return std::find(v.begin(), v.end(), t) != v.end(); }, "return true if item in the container");
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}
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template<typename Vector, typename Class_, typename std::enable_if< !has_equal_operator_s<typename Vector::value_type>::value >::type * = nullptr>
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void vector_maybe_has_equal_operator(Class_ &) {}
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template<typename Vector, typename Class_, typename std::enable_if< has_not_equal_operator_s<typename Vector::value_type>::value >::type * = nullptr>
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void vector_maybe_has_not_equal_operator(Class_ &cl) {
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cl.def(pybind11::self != pybind11::self);
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}
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template<typename Vector, typename Class_, typename std::enable_if< !has_not_equal_operator_s<typename Vector::value_type>::value >::type * = nullptr>
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void vector_maybe_has_not_equal_operator(Class_ &) {}
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template<typename Vector, typename Class_, typename std::enable_if< has_insertion_operator_s<typename Vector::value_type>::value >::type * = nullptr>
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void vector_maybe_has_insertion_operator(char const *name, Class_ &cl) {
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using size_type = typename Vector::size_type;
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cl.def("__repr__", [name](Vector &v) {
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std::ostringstream s;
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s << name << '[';
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for(size_type i=0; i<v.size(); ++i) {
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s << v[i];
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if(i != v.size()-1) s << ", ";
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}
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s << ']';
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return s.str();
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});
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}
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template<typename Vector, typename Class_, typename std::enable_if< !has_insertion_operator_s<typename Vector::value_type>::value >::type * = nullptr>
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void vector_maybe_has_insertion_operator(char const *, Class_ &) {}
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NAMESPACE_END(detail)
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template <typename T, typename Allocator = std::allocator<T>, typename holder_type = std::unique_ptr< std::vector<T, Allocator> > >
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class vector_binder {
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pybind11::class_<std::vector<T, Allocator>, holder_type > vector_binder(pybind11::module &m, char const *name, char const *doc=nullptr) {
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using Vector = std::vector<T, Allocator>;
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using SizeType = typename Vector::size_type;
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using Class_ = pybind11::class_<Vector, holder_type >;
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// template<typename U = T, typename std::enable_if< std::is_constructible<U>{} >::type * = nullptr>
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// void maybe_constructible(Class_ &cl) {
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// cl.def(pybind11::init<>());
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// }
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// template<typename U = T, typename std::enable_if< !std::is_constructible<U>{} >::type * = nullptr>
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// void maybe_constructible(Class_ &cl) {}
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Class_ cl(m, name, doc);
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template<typename U = T, typename std::enable_if< std::is_default_constructible<U>::value >::type * = nullptr>
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void maybe_default_constructible() {
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cl.def(pybind11::init<SizeType>());
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cl.def("resize", (void (Vector::*)(SizeType count)) &Vector::resize, "changes the number of elements stored");
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cl.def(pybind11::init<>());
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/// Slicing protocol
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cl.def("__getitem__", [](Vector const &v, pybind11::slice slice) -> Vector * {
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pybind11::ssize_t start, stop, step, slicelength;
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if(!slice.compute(v.size(), &start, &stop, &step, &slicelength))
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throw pybind11::error_already_set();
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Vector *seq = new Vector(slicelength);
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for (int i=0; i<slicelength; ++i) {
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(*seq)[i] = v[start]; start += step;
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}
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return seq;
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});
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}
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template<typename U = T, typename std::enable_if< !std::is_default_constructible<U>::value >::type * = nullptr>
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void maybe_default_constructible() {}
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detail::vector_maybe_default_constructible<Vector>(cl);
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detail::vector_maybe_copy_constructible<Vector>(cl);
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// Element access
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cl.def("front", [](Vector &v) {
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if(v.size()) return v.front();
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else throw pybind11::index_error();
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}, "access the first element");
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cl.def("back", [](Vector &v) {
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if(v.size()) return v.back();
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else throw pybind11::index_error();
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}, "access the last element ");
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// Not needed, the operator[] is already providing bounds checking cl.def("at", (T& (Vector::*)(SizeType i)) &Vector::at, "access specified element with bounds checking");
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template<typename U = T, typename std::enable_if< std::is_copy_constructible<U>::value >::type * = nullptr>
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void maybe_copy_constructible() {
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cl.def(pybind11::init< Vector const &>());
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}
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template<typename U = T, typename std::enable_if< !std::is_copy_constructible<U>::value >::type * = nullptr>
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void maybe_copy_constructible() {}
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// Capacity, C++ style
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cl.def("max_size", &Vector::max_size, "returns the maximum possible number of elements");
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cl.def("reserve", &Vector::reserve, "reserves storage");
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cl.def("capacity", &Vector::capacity, "returns the number of elements that can be held in currently allocated storage");
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cl.def("shrink_to_fit", &Vector::shrink_to_fit, "reduces memory usage by freeing unused memory");
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// Modifiers, C++ style
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cl.def("clear", &Vector::clear, "clears the contents");
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cl.def("swap", &Vector::swap, "swaps the contents");
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template<typename U = T, typename std::enable_if< has_equal_operator_s<U>::value >::type * = nullptr>
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void maybe_has_equal_operator() {
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cl.def(pybind11::self == pybind11::self);
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cl.def(pybind11::self != pybind11::self);
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cl.def("count", [](Vector const &v, T const & value) { return std::count(v.begin(), v.end(), value); }, "counts the elements that are equal to value");
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cl.def("remove", [](Vector &v, T const &t) {
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auto p = std::find(v.begin(), v.end(), t);
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if(p != v.end()) v.erase(p);
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else throw pybind11::value_error();
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}, "Remove the first item from the list whose value is x. It is an error if there is no such item.");
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cl.def("__contains__", [](Vector const &v, T const &t) { return std::find(v.begin(), v.end(), t) != v.end(); }, "return true if item in the container");
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}
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template<typename U = T, typename std::enable_if< !has_equal_operator_s<U>::value >::type * = nullptr>
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void maybe_has_equal_operator() {}
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template<typename U = T, typename std::enable_if< has_not_equal_operator_s<U>::value >::type * = nullptr>
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void maybe_has_not_equal_operator() {
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cl.def(pybind11::self != pybind11::self);
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}
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template<typename U = T, typename std::enable_if< !has_not_equal_operator_s<U>::value >::type * = nullptr>
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void maybe_has_not_equal_operator() {}
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template<typename U = T, typename std::enable_if< has_insertion_operator_s<U>::value >::type * = nullptr>
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void maybe_has_insertion_operator(char const *name) {
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cl.def("__repr__", [name](typename vector_binder<T>::Vector &v) {
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std::ostringstream s;
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s << name << '[';
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for(SizeType i=0; i<v.size(); ++i) {
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s << v[i];
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if(i != v.size()-1) s << ", ";
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}
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s << ']';
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return s.str();
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});
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}
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template<typename U = T, typename std::enable_if< !has_insertion_operator_s<U>::value >::type * = nullptr>
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void maybe_has_insertion_operator(char const *) {}
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public:
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Class_ cl;
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vector_binder(pybind11::module &m, char const *name, char const *doc=nullptr) : cl(m, name, doc) {
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cl.def(pybind11::init<>());
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//maybe_constructible(cl);
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maybe_default_constructible();
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maybe_copy_constructible();
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// Element access
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cl.def("front", [](Vector &v) {
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if(v.size()) return v.front();
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else throw pybind11::index_error();
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}, "access the first element");
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cl.def("back", [](Vector &v) {
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if(v.size()) return v.back();
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else throw pybind11::index_error();
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}, "access the last element ");
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// Not needed, the operator[] is already providing bounds checking cl.def("at", (T& (Vector::*)(SizeType i)) &Vector::at, "access specified element with bounds checking");
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// Capacity, C++ style
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cl.def("max_size", &Vector::max_size, "returns the maximum possible number of elements");
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cl.def("reserve", &Vector::reserve, "reserves storage");
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cl.def("capacity", &Vector::capacity, "returns the number of elements that can be held in currently allocated storage");
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cl.def("shrink_to_fit", &Vector::shrink_to_fit, "reduces memory usage by freeing unused memory");
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// Modifiers, C++ style
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cl.def("clear", &Vector::clear, "clears the contents");
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cl.def("swap", &Vector::swap, "swaps the contents");
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// Modifiers, Python style
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cl.def("append", (void (Vector::*)(const T&)) &Vector::push_back, "adds an element to the end");
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cl.def("insert", [](Vector &v, SizeType i, const T&t) {v.insert(v.begin()+i, t);}, "insert an item at a given position");
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cl.def("pop", [](Vector &v) {
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if(v.size()) {
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T t = v.back();
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v.pop_back();
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return t;
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}
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else throw pybind11::index_error();
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}, "remove and return last item");
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cl.def("pop", [](Vector &v, SizeType i) {
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if(i >= v.size()) throw pybind11::index_error();
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T t = v[i];
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v.erase(v.begin() + i);
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// Modifiers, Python style
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cl.def("append", (void (Vector::*)(const T&)) &Vector::push_back, "adds an element to the end");
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cl.def("insert", [](Vector &v, SizeType i, const T&t) {v.insert(v.begin()+i, t);}, "insert an item at a given position");
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cl.def("pop", [](Vector &v) {
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if(v.size()) {
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T t = v.back();
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v.pop_back();
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return t;
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}, "remove and return item at index");
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}
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else throw pybind11::index_error();
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}, "remove and return last item");
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cl.def("erase", [](Vector &v, SizeType i) {
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if(i >= v.size()) throw pybind11::index_error();
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v.erase(v.begin() + i);
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}, "erases element at index");
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cl.def("pop", [](Vector &v, SizeType i) {
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if(i >= v.size()) throw pybind11::index_error();
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T t = v[i];
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v.erase(v.begin() + i);
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return t;
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}, "remove and return item at index");
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cl.def("erase", [](Vector &v, SizeType i) {
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if(i >= v.size()) throw pybind11::index_error();
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v.erase(v.begin() + i);
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}, "erases element at index");
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// Python friendly bindings
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#ifdef PYTHON_ABI_VERSION // Python 3+
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cl.def("__bool__", [](Vector &v) -> bool { return v.size() != 0; }); // checks whether the container has any elements in it
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#else
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cl.def("__nonzero__", [](Vector &v) -> bool { return v.size() != 0; }); // checks whether the container has any elements in it
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#endif
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// Python friendly bindings
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#ifdef PYTHON_ABI_VERSION // Python 3+
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cl.def("__bool__", [](Vector &v) -> bool { return v.size() != 0; }); // checks whether the container has any elements in it
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#else
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cl.def("__nonzero__", [](Vector &v) -> bool { return v.size() != 0; }); // checks whether the container has any elements in it
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#endif
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cl.def("__getitem__", [](Vector const &v, SizeType i) {
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if(i >= v.size()) throw pybind11::index_error();
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return v[i];
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});
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cl.def("__setitem__", [](Vector &v, SizeType i, T const & t) {
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if(i >= v.size()) throw pybind11::index_error();
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v[i] = t;
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cl.def("__getitem__", [](Vector const &v, SizeType i) {
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if(i >= v.size()) throw pybind11::index_error();
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return v[i];
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});
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cl.def("__len__", &Vector::size);
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cl.def("__setitem__", [](Vector &v, SizeType i, T const & t) {
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if(i >= v.size()) throw pybind11::index_error();
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v[i] = t;
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});
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cl.def("__iter__", [](Vector &v) { return pybind11::make_iterator(v.begin(), v.end()); },
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pybind11::keep_alive<0, 1>() /* Essential: keep object alive while iterator exists */);
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cl.def("__len__", &Vector::size);
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/// Slicing protocol
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cl.def("__setitem__", [](Vector &v, pybind11::slice slice, Vector const &value) {
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pybind11::ssize_t start, stop, step, slicelength;
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if(!slice.compute(v.size(), &start, &stop, &step, &slicelength))
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throw pybind11::error_already_set();
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if((size_t) slicelength != value.size())
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throw std::runtime_error("Left and right hand size of slice assignment have different sizes!");
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for(int i=0; i<slicelength; ++i) {
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v[start] = value[i]; start += step;
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}
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});
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cl.def("__iter__", [](Vector &v) { return pybind11::make_iterator(v.begin(), v.end()); },
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pybind11::keep_alive<0, 1>() /* Essential: keep object alive while iterator exists */);
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// Comparisons
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maybe_has_equal_operator();
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maybe_has_not_equal_operator();
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/// Slicing protocol
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cl.def("__setitem__", [](Vector &v, pybind11::slice slice, Vector const &value) {
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pybind11::ssize_t start, stop, step, slicelength;
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if(!slice.compute(v.size(), &start, &stop, &step, &slicelength))
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throw pybind11::error_already_set();
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if((size_t) slicelength != value.size())
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throw std::runtime_error("Left and right hand size of slice assignment have different sizes!");
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for(int i=0; i<slicelength; ++i) {
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v[start] = value[i]; start += step;
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}
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});
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// Printing
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maybe_has_insertion_operator(name);
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// Comparisons
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detail::vector_maybe_has_equal_operator<Vector>(cl);
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detail::vector_maybe_has_not_equal_operator<Vector>(cl);
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// C++ style functions deprecated, leaving it here as an example
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//cl.def("empty", &Vector::empty, "checks whether the container is empty");
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//cl.def("size", &Vector::size, "returns the number of elements");
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//cl.def("push_back", (void (Vector::*)(const T&)) &Vector::push_back, "adds an element to the end");
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//cl.def("pop_back", &Vector::pop_back, "removes the last element");
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}
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};
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// Printing
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detail::vector_maybe_has_insertion_operator<Vector>(name, cl);
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// C++ style functions deprecated, leaving it here as an example
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//cl.def("empty", &Vector::empty, "checks whether the container is empty");
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//cl.def("size", &Vector::size, "returns the number of elements");
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//cl.def("push_back", (void (Vector::*)(const T&)) &Vector::push_back, "adds an element to the end");
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//cl.def("pop_back", &Vector::pop_back, "removes the last element");
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return cl;
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}
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NAMESPACE_END(pybind11)
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