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New automatic return value policy for cat() and make_tuple(), fixed an ambiguity issue
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@ -418,6 +418,9 @@ functions. The default policy is :enum:`return_value_policy::automatic`.
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| :enum:`return_value_policy::automatic` | Automatic: copy objects returned as values and take ownership of |
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| | objects returned as pointers |
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+--------------------------------------------------+---------------------------------------------------------------------------+
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| :enum:`return_value_policy::automatic_reference` | Automatic variant 2 : copy objects returned as values and reference |
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| | objects returned as pointers |
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+--------------------------------------------------+---------------------------------------------------------------------------+
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| :enum:`return_value_policy::copy` | Create a new copy of the returned object, which will be owned by Python |
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+--------------------------------------------------+---------------------------------------------------------------------------+
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| :enum:`return_value_policy::take_ownership` | Reference the existing object and take ownership. Python will call |
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@ -178,6 +178,8 @@ public:
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if (policy == return_value_policy::automatic)
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policy = return_value_policy::take_ownership;
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else if (policy == return_value_policy::automatic_reference)
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policy = return_value_policy::reference;
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if (policy == return_value_policy::copy) {
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wrapper->value = copy_constructor(wrapper->value);
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@ -217,7 +219,7 @@ public:
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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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if (policy == return_value_policy::automatic || policy == return_value_policy::automatic_reference)
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policy = return_value_policy::copy;
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return cast(&src, policy, parent);
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}
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@ -706,20 +708,23 @@ template <typename T> inline T cast(handle handle) {
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return (T) conv;
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}
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template <typename T> inline object cast(const T &value, return_value_policy policy = return_value_policy::automatic, handle parent = handle()) {
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template <typename T> inline object cast(const T &value, return_value_policy policy = return_value_policy::automatic_reference, handle parent = handle()) {
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if (policy == return_value_policy::automatic)
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policy = std::is_pointer<T>::value ? return_value_policy::take_ownership : return_value_policy::copy;
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else if (policy == return_value_policy::automatic_reference)
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policy = std::is_pointer<T>::value ? return_value_policy::reference : return_value_policy::copy;
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return object(detail::type_caster<typename detail::intrinsic_type<T>::type>::cast(value, policy, parent), false);
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}
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template <typename T> inline T handle::cast() const { return pybind11::cast<T>(*this); }
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template <> inline void handle::cast() const { return; }
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template <typename... Args> inline tuple make_tuple(Args&&... args_) {
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template <return_value_policy policy = return_value_policy::automatic_reference,
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typename... Args> inline tuple make_tuple(Args&&... args_) {
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const size_t size = sizeof...(Args);
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std::array<object, size> args {
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{ object(detail::type_caster<typename detail::intrinsic_type<Args>::type>::cast(
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std::forward<Args>(args_), return_value_policy::automatic, nullptr), false)... }
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std::forward<Args>(args_), policy, nullptr), false)... }
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};
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for (auto &arg_value : args)
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if (!arg_value)
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@ -732,7 +737,7 @@ template <typename... Args> inline tuple make_tuple(Args&&... args_) {
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}
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template <typename... Args> inline object handle::call(Args&&... args) const {
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tuple args_tuple = make_tuple(std::forward<Args>(args)...);
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tuple args_tuple = pybind11::make_tuple(std::forward<Args>(args)...);
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object result(PyObject_CallObject(m_ptr, args_tuple.ptr()), false);
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if (!result)
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throw error_already_set();
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@ -137,6 +137,9 @@ enum class return_value_policy : int {
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/** Automatic: copy objects returned as values and take ownership of objects
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returned as pointers */
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automatic = 0,
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/** Automatic variant 2: copy objects returned as values and reference objects
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returned as pointers */
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automatic_reference,
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/** Reference the object and take ownership. Python will call the
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destructor and delete operator when the reference count reaches zero */
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take_ownership,
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