mirror of
https://github.com/pybind/pybind11.git
synced 2024-11-15 18:04:45 +00:00
657 lines
24 KiB
C++
657 lines
24 KiB
C++
/*
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pybind11/cast.h: Partial template specializations to cast between
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C++ and Python types
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Copyright (c) 2015 Wenzel Jakob <wenzel@inf.ethz.ch>
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All rights reserved. Use of this source code is governed by a
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BSD-style license that can be found in the LICENSE file.
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*/
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#pragma once
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#include "pytypes.h"
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#include "typeid.h"
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#include "descr.h"
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#include <array>
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#include <limits>
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NAMESPACE_BEGIN(pybind11)
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/// Thin wrapper type used to treat certain data types as opaque (e.g. STL vectors, etc.)
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template <typename Type> class opaque {
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public:
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template <typename... Args> opaque(Args&&... args) : value(std::forward<Args>(args)...) { }
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operator Type&() { return value; }
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operator const Type&() const { return value; }
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operator Type*() { return &value; }
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operator const Type*() const { return &value; }
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Type* operator->() { return &value; }
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const Type* operator->() const { return &value; }
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private:
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Type value;
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};
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NAMESPACE_BEGIN(detail)
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/// Additional type information which does not fit into the PyTypeObject
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struct type_info {
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PyTypeObject *type;
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size_t type_size;
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void (*init_holder)(PyObject *, const void *);
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std::vector<PyObject *(*)(PyObject *, PyTypeObject *) > implicit_conversions;
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buffer_info *(*get_buffer)(PyObject *, void *) = nullptr;
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void *get_buffer_data = nullptr;
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};
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PYBIND11_NOINLINE inline internals &get_internals() {
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static internals *internals_ptr = nullptr;
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if (internals_ptr)
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return *internals_ptr;
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handle builtins(PyEval_GetBuiltins());
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const char *id = PYBIND11_INTERNALS_ID;
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capsule caps(builtins[id]);
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if (caps.check()) {
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internals_ptr = caps;
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} else {
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internals_ptr = new internals();
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builtins[id] = capsule(internals_ptr);
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}
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return *internals_ptr;
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}
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PYBIND11_NOINLINE inline detail::type_info* get_type_info(PyTypeObject *type) {
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auto const &type_dict = get_internals().registered_types_py;
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do {
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auto it = type_dict.find(type);
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if (it != type_dict.end())
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return (detail::type_info *) it->second;
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type = type->tp_base;
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if (!type)
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pybind11_fail("pybind11::detail::get_type_info: unable to find type object!");
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} while (true);
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}
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PYBIND11_NOINLINE inline detail::type_info *get_type_info(const std::type_info &tp) {
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auto &types = get_internals().registered_types_cpp;
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auto it = types.find(std::type_index(tp));
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if (it != types.end())
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return (detail::type_info *) it->second;
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return nullptr;
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}
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PYBIND11_NOINLINE inline handle get_type_handle(const std::type_info &tp) {
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detail::type_info *type_info = get_type_info(tp);
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return handle(type_info ? ((PyObject *) type_info->type) : nullptr);
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}
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PYBIND11_NOINLINE inline std::string error_string() {
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std::string errorString;
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PyThreadState *tstate = PyThreadState_GET();
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if (tstate == nullptr)
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return "";
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if (tstate->curexc_type) {
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errorString += (std::string) handle(tstate->curexc_type).str();
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errorString += ": ";
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}
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if (tstate->curexc_value)
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errorString += (std::string) handle(tstate->curexc_value).str();
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return errorString;
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}
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PYBIND11_NOINLINE inline handle get_object_handle(const void *ptr) {
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auto instances = get_internals().registered_instances;
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auto it = instances.find(ptr);
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if (it == instances.end())
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return handle();
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return handle((PyObject *) it->second);
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}
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class type_caster_generic {
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public:
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PYBIND11_NOINLINE type_caster_generic(const std::type_info &type_info)
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: typeinfo(get_type_info(type_info)) { }
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PYBIND11_NOINLINE bool load(handle src, bool convert) {
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if (!src || !typeinfo)
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return false;
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if (src.ptr() == Py_None) {
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value = nullptr;
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return true;
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} else if (PyType_IsSubtype(Py_TYPE(src.ptr()), typeinfo->type)) {
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value = ((instance<void> *) src.ptr())->value;
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return true;
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}
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if (convert) {
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for (auto &converter : typeinfo->implicit_conversions) {
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temp = object(converter(src.ptr(), typeinfo->type), false);
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if (load(temp, false))
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return true;
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}
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}
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return false;
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}
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PYBIND11_NOINLINE static handle cast(const void *_src, return_value_policy policy, handle parent,
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const std::type_info *type_info,
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void *(*copy_constructor)(const void *),
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const void *existing_holder = nullptr) {
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void *src = const_cast<void *>(_src);
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if (src == nullptr)
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return handle(Py_None).inc_ref();
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// avoid an issue with internal references matching their parent's address
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bool dont_cache = policy == return_value_policy::reference_internal &&
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parent && ((instance<void> *) parent.ptr())->value == (void *) src;
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auto& internals = get_internals();
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auto it_instance = internals.registered_instances.find(src);
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if (it_instance != internals.registered_instances.end() && !dont_cache)
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return handle((PyObject *) it_instance->second).inc_ref();
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auto it = internals.registered_types_cpp.find(std::type_index(*type_info));
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if (it == internals.registered_types_cpp.end()) {
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std::string tname = type_info->name();
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detail::clean_type_id(tname);
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std::string msg = "Unregistered type : " + tname;
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PyErr_SetString(PyExc_TypeError, msg.c_str());
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return handle();
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}
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auto tinfo = (const detail::type_info *) it->second;
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object inst(PyType_GenericAlloc(tinfo->type, 0), false);
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auto wrapper = (instance<void> *) inst.ptr();
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wrapper->value = src;
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wrapper->owned = true;
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wrapper->parent = nullptr;
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if (policy == return_value_policy::automatic)
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policy = return_value_policy::take_ownership;
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if (policy == return_value_policy::copy) {
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wrapper->value = copy_constructor(wrapper->value);
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if (wrapper->value == nullptr)
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throw cast_error("return_value_policy = copy, but the object is non-copyable!");
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} else if (policy == return_value_policy::reference) {
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wrapper->owned = false;
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} else if (policy == return_value_policy::reference_internal) {
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wrapper->owned = false;
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wrapper->parent = parent.inc_ref().ptr();
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}
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tinfo->init_holder(inst.ptr(), existing_holder);
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if (!dont_cache)
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internals.registered_instances[wrapper->value] = inst.ptr();
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return inst.release();
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}
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protected:
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const type_info *typeinfo = nullptr;
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void *value = nullptr;
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object temp;
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};
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/// Generic type caster for objects stored on the heap
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template <typename type, typename Enable = void> class type_caster : public type_caster_generic {
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public:
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static PYBIND11_DESCR name() { return type_descr(_<type>()); }
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type_caster() : type_caster_generic(typeid(type)) { }
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static handle cast(const type &src, return_value_policy policy, handle parent) {
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if (policy == return_value_policy::automatic)
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policy = return_value_policy::copy;
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return type_caster_generic::cast(&src, policy, parent, &typeid(type), ©_constructor);
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}
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static handle cast(const type *src, return_value_policy policy, handle parent) {
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return type_caster_generic::cast(src, policy, parent, &typeid(type), ©_constructor);
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}
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operator type*() { return (type *) value; }
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operator type&() { return *((type *) value); }
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protected:
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template <typename T = type, typename std::enable_if<detail::is_copy_constructible<T>::value, int>::type = 0>
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static void *copy_constructor(const void *arg) {
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return (void *) new type(*((const type *) arg));
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}
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template <typename T = type, typename std::enable_if<!detail::is_copy_constructible<T>::value, int>::type = 0>
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static void *copy_constructor(const void *) { return nullptr; }
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};
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#define PYBIND11_TYPE_CASTER(type, py_name) \
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protected: \
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type value; \
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public: \
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static PYBIND11_DESCR name() { return type_descr(py_name); } \
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static handle cast(const type *src, return_value_policy policy, handle parent) { \
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return cast(*src, policy, parent); \
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} \
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operator type*() { return &value; } \
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operator type&() { return value; }
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#define PYBIND11_DECLARE_HOLDER_TYPE(type, holder_type) \
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namespace pybind11 { namespace detail { \
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template <typename type> class type_caster<holder_type> \
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: public type_caster_holder<type, holder_type> { }; \
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}}
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template <typename T>
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struct type_caster<
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T, typename std::enable_if<std::is_integral<T>::value ||
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std::is_floating_point<T>::value>::type> {
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typedef typename std::conditional<sizeof(T) <= sizeof(long), long, long long>::type _py_type_0;
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typedef typename std::conditional<std::is_signed<T>::value, _py_type_0, typename std::make_unsigned<_py_type_0>::type>::type _py_type_1;
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typedef typename std::conditional<std::is_floating_point<T>::value, double, _py_type_1>::type py_type;
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public:
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bool load(handle src, bool) {
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py_type py_value;
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if (std::is_floating_point<T>::value) {
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py_value = (py_type) PyFloat_AsDouble(src.ptr());
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} else if (sizeof(T) <= sizeof(long)) {
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if (std::is_signed<T>::value)
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py_value = (py_type) PyLong_AsLong(src.ptr());
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else
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py_value = (py_type) PyLong_AsUnsignedLong(src.ptr());
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} else {
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if (std::is_signed<T>::value)
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py_value = (py_type) PYBIND11_LONG_AS_LONGLONG(src.ptr());
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else
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py_value = (py_type) PYBIND11_LONG_AS_UNSIGNED_LONGLONG(src.ptr());
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}
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if ((py_value == (py_type) -1 && PyErr_Occurred()) ||
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(std::is_integral<T>::value && sizeof(py_type) != sizeof(T) &&
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(py_value < (py_type) std::numeric_limits<T>::min() ||
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py_value > (py_type) std::numeric_limits<T>::max()))) {
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PyErr_Clear();
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return false;
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}
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value = (T) py_value;
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return true;
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}
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static handle cast(T src, return_value_policy /* policy */, handle /* parent */) {
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if (std::is_floating_point<T>::value) {
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return PyFloat_FromDouble((double) src);
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} else if (sizeof(T) <= sizeof(long)) {
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if (std::is_signed<T>::value)
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return PyLong_FromLong((long) src);
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else
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return PyLong_FromUnsignedLong((unsigned long) src);
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} else {
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if (std::is_signed<T>::value)
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return PyLong_FromLongLong((long long) src);
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else
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return PyLong_FromUnsignedLongLong((unsigned long long) src);
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}
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}
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static handle cast(const T *src, return_value_policy policy, handle parent) {
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return cast(*src, policy, parent);
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}
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template <typename T2 = T, typename std::enable_if<std::is_integral<T2>::value, int>::type = 0>
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static PYBIND11_DESCR name() { return type_descr(_("int")); }
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template <typename T2 = T, typename std::enable_if<!std::is_integral<T2>::value, int>::type = 0>
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static PYBIND11_DESCR name() { return type_descr(_("float")); }
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operator T*() { return &value; }
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operator T&() { return value; }
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protected:
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T value;
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};
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template <> class type_caster<void_type> {
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public:
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bool load(handle, bool) { return false; }
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static handle cast(void_type, return_value_policy /* policy */, handle /* parent */) {
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return handle(Py_None).inc_ref();
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}
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PYBIND11_TYPE_CASTER(void_type, _("NoneType"));
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};
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template <> class type_caster<void> : public type_caster<void_type> { };
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template <> class type_caster<std::nullptr_t> : public type_caster<void_type> { };
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template <> class type_caster<bool> {
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public:
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bool load(handle src, bool) {
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if (src.ptr() == Py_True) { value = true; return true; }
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else if (src.ptr() == Py_False) { value = false; return true; }
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else return false;
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}
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static handle cast(bool src, return_value_policy /* policy */, handle /* parent */) {
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return handle(src ? Py_True : Py_False).inc_ref();
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}
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PYBIND11_TYPE_CASTER(bool, _("bool"));
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};
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template <> class type_caster<std::string> {
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public:
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bool load(handle src, bool) {
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object temp;
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handle load_src = src;
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if (PyUnicode_Check(load_src.ptr())) {
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temp = object(PyUnicode_AsUTF8String(load_src.ptr()), false);
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if (!temp) { PyErr_Clear(); return false; } // UnicodeEncodeError
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load_src = temp;
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}
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char *buffer;
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ssize_t length;
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int err = PYBIND11_BYTES_AS_STRING_AND_SIZE(load_src.ptr(), &buffer, &length);
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if (err == -1) { PyErr_Clear(); return false; } // TypeError
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value = std::string(buffer, length);
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return true;
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}
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static handle cast(const std::string &src, return_value_policy /* policy */, handle /* parent */) {
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return PyUnicode_FromStringAndSize(src.c_str(), src.length());
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}
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PYBIND11_TYPE_CASTER(std::string, _(PYBIND11_STRING_NAME));
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};
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template <> class type_caster<std::wstring> {
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public:
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bool load(handle src, bool) {
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object temp;
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handle load_src = src;
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if (!PyUnicode_Check(load_src.ptr())) {
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temp = object(PyUnicode_FromObject(load_src.ptr()), false);
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if (!temp) { PyErr_Clear(); return false; }
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load_src = temp;
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}
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wchar_t *buffer = nullptr;
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ssize_t length = -1;
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#if PY_MAJOR_VERSION >= 3
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buffer = PyUnicode_AsWideCharString(load_src.ptr(), &length);
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#else
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temp = object(
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sizeof(wchar_t) == sizeof(short)
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? PyUnicode_AsUTF16String(load_src.ptr())
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: PyUnicode_AsUTF32String(load_src.ptr()), false);
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if (temp) {
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int err = PYBIND11_BYTES_AS_STRING_AND_SIZE(temp.ptr(), (char **) &buffer, &length);
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if (err == -1) { buffer = nullptr; } // TypeError
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length = length / sizeof(wchar_t) - 1; ++buffer; // Skip BOM
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}
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#endif
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if (!buffer) { PyErr_Clear(); return false; }
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value = std::wstring(buffer, length);
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return true;
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}
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static handle cast(const std::wstring &src, return_value_policy /* policy */, handle /* parent */) {
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return PyUnicode_FromWideChar(src.c_str(), src.length());
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}
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PYBIND11_TYPE_CASTER(std::wstring, _(PYBIND11_STRING_NAME));
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};
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template <> class type_caster<char> : public type_caster<std::string> {
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public:
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static handle cast(const char *src, return_value_policy /* policy */, handle /* parent */) {
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return PyUnicode_FromString(src);
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}
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static handle cast(char src, return_value_policy /* policy */, handle /* parent */) {
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char str[2] = { src, '\0' };
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return PyUnicode_DecodeLatin1(str, 1, nullptr);
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}
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operator char*() { return (char *) value.c_str(); }
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operator char() { if (value.length() > 0) return value[0]; else return '\0'; }
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static PYBIND11_DESCR name() { return type_descr(_(PYBIND11_STRING_NAME)); }
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};
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template <> class type_caster<wchar_t> : public type_caster<std::wstring> {
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public:
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static handle cast(const wchar_t *src, return_value_policy /* policy */, handle /* parent */) {
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return PyUnicode_FromWideChar(src, wcslen(src));
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}
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static handle cast(wchar_t src, return_value_policy /* policy */, handle /* parent */) {
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wchar_t wstr[2] = { src, L'\0' };
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return PyUnicode_FromWideChar(wstr, 1);
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}
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operator wchar_t*() { return (wchar_t *)value.c_str(); }
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operator wchar_t() { if (value.length() > 0) return value[0]; else return L'\0'; }
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static PYBIND11_DESCR name() { return type_descr(_(PYBIND11_STRING_NAME)); }
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};
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template <typename T1, typename T2> class type_caster<std::pair<T1, T2>> {
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typedef std::pair<T1, T2> type;
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public:
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bool load(handle src, bool convert) {
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if (!PyTuple_Check(src.ptr()) || PyTuple_Size(src.ptr()) != 2)
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return false;
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return first.load(PyTuple_GET_ITEM(src.ptr(), 0), convert) &&
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second.load(PyTuple_GET_ITEM(src.ptr(), 1), convert);
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}
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static handle cast(const type &src, return_value_policy policy, handle parent) {
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object o1 = object(type_caster<typename intrinsic_type<T1>::type>::cast(src.first, policy, parent), false);
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object o2 = object(type_caster<typename intrinsic_type<T2>::type>::cast(src.second, policy, parent), false);
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if (!o1 || !o2)
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return handle();
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tuple result(2);
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PyTuple_SET_ITEM(result.ptr(), 0, o1.release().ptr());
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PyTuple_SET_ITEM(result.ptr(), 1, o2.release().ptr());
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return result.release();
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}
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static PYBIND11_DESCR name() {
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return type_descr(
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_("(") + type_caster<typename intrinsic_type<T1>::type>::name() +
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_(", ") + type_caster<typename intrinsic_type<T2>::type>::name() + _(")"));
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}
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|
|
operator type() {
|
|
return type(first, second);
|
|
}
|
|
protected:
|
|
type_caster<typename intrinsic_type<T1>::type> first;
|
|
type_caster<typename intrinsic_type<T2>::type> second;
|
|
};
|
|
|
|
template <typename... Tuple> class type_caster<std::tuple<Tuple...>> {
|
|
typedef std::tuple<Tuple...> type;
|
|
public:
|
|
enum { size = sizeof...(Tuple) };
|
|
|
|
bool load(handle src, bool convert) {
|
|
return load(src, convert, typename make_index_sequence<sizeof...(Tuple)>::type());
|
|
}
|
|
|
|
static handle cast(const type &src, return_value_policy policy, handle parent) {
|
|
return cast(src, policy, parent, typename make_index_sequence<size>::type());
|
|
}
|
|
|
|
static PYBIND11_DESCR name() {
|
|
return type_descr(
|
|
_("(") +
|
|
detail::concat(type_caster<typename intrinsic_type<Tuple>::type>::name()...) +
|
|
_(")"));
|
|
}
|
|
|
|
template <typename ReturnValue, typename Func> typename std::enable_if<!std::is_void<ReturnValue>::value, ReturnValue>::type call(Func &&f) {
|
|
return call<ReturnValue>(std::forward<Func>(f), typename make_index_sequence<sizeof...(Tuple)>::type());
|
|
}
|
|
|
|
template <typename ReturnValue, typename Func> typename std::enable_if<std::is_void<ReturnValue>::value, void_type>::type call(Func &&f) {
|
|
call<ReturnValue>(std::forward<Func>(f), typename make_index_sequence<sizeof...(Tuple)>::type());
|
|
return void_type();
|
|
}
|
|
|
|
operator type() {
|
|
return cast(typename make_index_sequence<sizeof...(Tuple)>::type());
|
|
}
|
|
|
|
protected:
|
|
template <typename ReturnValue, typename Func, size_t ... Index> ReturnValue call(Func &&f, index_sequence<Index...>) {
|
|
return f((Tuple) std::get<Index>(value)...);
|
|
}
|
|
|
|
template <size_t ... Index> type cast(index_sequence<Index...>) {
|
|
return type((Tuple) std::get<Index>(value)...);
|
|
}
|
|
|
|
template <size_t ... Indices> bool load(handle src, bool convert, index_sequence<Indices...>) {
|
|
if (!PyTuple_Check(src.ptr()) || PyTuple_Size(src.ptr()) != size)
|
|
return false;
|
|
std::array<bool, size> success {{
|
|
(PyTuple_GET_ITEM(src.ptr(), Indices) != nullptr ? std::get<Indices>(value).load(PyTuple_GET_ITEM(src.ptr(), Indices), convert) : false)...
|
|
}};
|
|
(void) convert; /* avoid a warning when the tuple is empty */
|
|
for (bool r : success)
|
|
if (!r)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/* Implementation: Convert a C++ tuple into a Python tuple */
|
|
template <size_t ... Indices> static handle cast(const type &src, return_value_policy policy, handle parent, index_sequence<Indices...>) {
|
|
std::array<object, size> entries {{
|
|
object(type_caster<typename intrinsic_type<Tuple>::type>::cast(std::get<Indices>(src), policy, parent), false)...
|
|
}};
|
|
for (const auto &entry: entries)
|
|
if (!entry)
|
|
return handle();
|
|
tuple result(size);
|
|
int counter = 0;
|
|
for (auto & entry: entries)
|
|
PyTuple_SET_ITEM(result.ptr(), counter++, entry.release().ptr());
|
|
return result.release();
|
|
}
|
|
|
|
protected:
|
|
std::tuple<type_caster<typename intrinsic_type<Tuple>::type>...> value;
|
|
};
|
|
|
|
/// Type caster for holder types like std::shared_ptr, etc.
|
|
template <typename type, typename holder_type> class type_caster_holder : public type_caster<type> {
|
|
public:
|
|
using type_caster<type>::cast;
|
|
using type_caster<type>::typeinfo;
|
|
using type_caster<type>::value;
|
|
using type_caster<type>::temp;
|
|
using type_caster<type>::copy_constructor;
|
|
|
|
bool load(handle src, bool convert) {
|
|
if (!src || !typeinfo) {
|
|
return false;
|
|
} else if (src.ptr() == Py_None) {
|
|
value = nullptr;
|
|
return true;
|
|
} else if (PyType_IsSubtype(Py_TYPE(src.ptr()), typeinfo->type)) {
|
|
auto inst = (instance<type, holder_type> *) src.ptr();
|
|
value = (void *) inst->value;
|
|
holder = inst->holder;
|
|
return true;
|
|
}
|
|
|
|
if (convert) {
|
|
for (auto &converter : typeinfo->implicit_conversions) {
|
|
temp = object(converter(src.ptr(), typeinfo->type), false);
|
|
if (load(temp, false))
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
explicit operator type*() { return this->value; }
|
|
explicit operator type&() { return *(this->value); }
|
|
explicit operator holder_type*() { return &holder; }
|
|
|
|
// Workaround for Intel compiler bug
|
|
// see pybind11 issue 94
|
|
#if defined(__ICC) || defined(__INTEL_COMPILER)
|
|
operator holder_type&() { return holder; }
|
|
#else
|
|
explicit operator holder_type&() { return holder; }
|
|
#endif
|
|
|
|
static handle cast(const holder_type &src, return_value_policy policy, handle parent) {
|
|
return type_caster_generic::cast(
|
|
src.get(), policy, parent, &typeid(type), ©_constructor, &src);
|
|
}
|
|
|
|
protected:
|
|
holder_type holder;
|
|
};
|
|
|
|
template <typename T> struct handle_type_name { static PYBIND11_DESCR name() { return _<T>(); } };
|
|
template <> struct handle_type_name<bytes> { static PYBIND11_DESCR name() { return _(PYBIND11_BYTES_NAME); } };
|
|
|
|
template <typename type>
|
|
struct type_caster<type, typename std::enable_if<std::is_base_of<handle, type>::value>::type> {
|
|
public:
|
|
template <typename T = type, typename std::enable_if<std::is_same<T, handle>::value, int>::type = 0>
|
|
bool load(handle src, bool /* convert */) { value = src; return value.check(); }
|
|
|
|
template <typename T = type, typename std::enable_if<!std::is_same<T, handle>::value, int>::type = 0>
|
|
bool load(handle src, bool /* convert */) { value = type(src, true); return value.check(); }
|
|
|
|
static handle cast(const handle &src, return_value_policy /* policy */, handle /* parent */) {
|
|
return src.inc_ref();
|
|
}
|
|
PYBIND11_TYPE_CASTER(type, handle_type_name<type>::name());
|
|
};
|
|
|
|
NAMESPACE_END(detail)
|
|
|
|
template <typename T> inline T cast(handle handle) {
|
|
detail::type_caster<typename detail::intrinsic_type<T>::type> conv;
|
|
if (!conv.load(handle, true))
|
|
throw cast_error("Unable to cast Python object to C++ type");
|
|
return (T) conv;
|
|
}
|
|
|
|
template <typename T> inline object cast(const T &value, return_value_policy policy = return_value_policy::automatic, handle parent = handle()) {
|
|
if (policy == return_value_policy::automatic)
|
|
policy = std::is_pointer<T>::value ? return_value_policy::take_ownership : return_value_policy::copy;
|
|
return object(detail::type_caster<typename detail::intrinsic_type<T>::type>::cast(value, policy, parent), false);
|
|
}
|
|
|
|
template <typename T> inline T handle::cast() const { return pybind11::cast<T>(*this); }
|
|
template <> inline void handle::cast() const { return; }
|
|
|
|
template <typename... Args> inline object handle::call(Args&&... args_) const {
|
|
const size_t size = sizeof...(Args);
|
|
std::array<object, size> args {
|
|
{ object(detail::type_caster<typename detail::intrinsic_type<Args>::type>::cast(
|
|
std::forward<Args>(args_), return_value_policy::reference, nullptr), false)... }
|
|
};
|
|
for (auto &arg_value : args)
|
|
if (!arg_value)
|
|
throw cast_error("handle::call(): unable to convert input "
|
|
"arguments to Python objects");
|
|
tuple args_tuple(size);
|
|
int counter = 0;
|
|
for (auto &arg_value : args)
|
|
PyTuple_SET_ITEM(args_tuple.ptr(), counter++, arg_value.release().ptr());
|
|
object result(PyObject_CallObject(m_ptr, args_tuple.ptr()), false);
|
|
if (!result)
|
|
throw error_already_set();
|
|
return result;
|
|
}
|
|
|
|
NAMESPACE_END(pybind11)
|