Merge branch 'master' into cygwin

docs/advanced.rst

@@ -268,8 +268,14 @@ helper class that is defined as follows:
 
 The macro :func:`PYBIND11_OVERLOAD_PURE` should be used for pure virtual
 functions, and :func:`PYBIND11_OVERLOAD` should be used for functions which have
-a default implementation. The binding code also needs a few minor adaptations
-(highlighted):
+a default implementation. 
+
+There are also two alternate macros :func:`PYBIND11_OVERLOAD_PURE_NAME` and
+:func:`PYBIND11_OVERLOAD_NAME` which take a string-valued name argument
+after the *Name of the function* slot. This is useful when the C++ and Python
+versions of the function have different names, e.g. ``operator()`` vs ``__call__``.
+
+The binding code also needs a few minor adaptations (highlighted):
 
 .. code-block:: cpp
     :emphasize-lines: 4,6,7
@@ -277,9 +283,8 @@ a default implementation. The binding code also needs a few minor adaptations
     PYBIND11_PLUGIN(example) {
         py::module m("example", "pybind11 example plugin");
 
-        py::class_<PyAnimal> animal(m, "Animal");
+        py::class_<Animal, std::unique_ptr<Animal>, PyAnimal /* <--- trampoline*/> animal(m, "Animal");
         animal
-            .alias<Animal>()
             .def(py::init<>())
             .def("go", &Animal::go);
 
@@ -291,10 +296,10 @@ a default implementation. The binding code also needs a few minor adaptations
         return m.ptr();
     }
 
-Importantly, the trampoline helper class is used as the template argument to
-:class:`class_`, and a call to :func:`class_::alias` informs the binding
-generator that this is merely an alias for the underlying type ``Animal``.
-Following this, we are able to define a constructor as usual.
+Importantly, pybind11 is made aware of the trampoline trampoline helper class
+by specifying it as the *third* template argument to :class:`class_`. The
+second argument with the unique pointer is simply the default holder type used
+by pybind11. Following this, we are able to define a constructor as usual.
 
 The Python session below shows how to override ``Animal::go`` and invoke it via
 a virtual method call.
@@ -315,12 +320,12 @@ a virtual method call.
 
 .. warning::
 
-    Both :func:`PYBIND11_OVERLOAD` and :func:`PYBIND11_OVERLOAD_PURE` are
-    macros, which means that they can get confused by commas in a template
-    argument such as ``PYBIND11_OVERLOAD(MyReturnValue<T1, T2>, myFunc)``. In
-    this case, the preprocessor assumes that the comma indicates the beginnning
-    of the next parameter. Use a ``typedef`` to bind the template to another
-    name and use it in the macro to avoid this problem.
+    The :func:`PYBIND11_OVERLOAD_*` calls are all just macros, which means that
+    they can get confused by commas in a template argument such as
+    ``PYBIND11_OVERLOAD(MyReturnValue<T1, T2>, myFunc)``. In this case, the
+    preprocessor assumes that the comma indicates the beginnning of the next
+    parameter. Use a ``typedef`` to bind the template to another name and use
+    it in the macro to avoid this problem.
 
 .. seealso::
 
@@ -363,9 +368,8 @@ be realized as follows (important changes highlighted):
     PYBIND11_PLUGIN(example) {
         py::module m("example", "pybind11 example plugin");
 
-        py::class_<PyAnimal> animal(m, "Animal");
+        py::class_<Animal, std::unique_ptr<Animal>, PyAnimal> animal(m, "Animal");
         animal
-            .alias<Animal>()
             .def(py::init<>())
             .def("go", &Animal::go);
 

docs/changelog.rst

@@ -5,9 +5,11 @@ Changelog
 
 1.8 (Not yet released)
 ----------------------
+* Redesigned virtual call mechanism and user-facing syntax (breaking change!)
 * Prevent implicit conversion of floating point values to integral types in
   function arguments
 * Transparent conversion of sparse and dense Eigen data types
+* ``std::vector<>`` type bindings analogous to Boost.Python's ``indexing_suite``
 * Fixed incorrect default return value policy for functions returning a shared
   pointer
 * Don't allow casting a ``None`` value into a C++ lvalue reference
@@ -16,10 +18,19 @@ Changelog
 * Extended ``str`` type to also work with ``bytes`` instances
 * Added ``[[noreturn]]`` attribute to ``pybind11_fail()`` to quench some
   compiler warnings
+* List function arguments in exception text when the dispatch code cannot find
+  a matching overload
 * Various minor ``iterator`` and ``make_iterator()`` improvements
+* Transparently support ``__bool__`` on Python 2.x and Python 3.x
+* Fixed issue with destructor of unpickled object not being called
 * Minor CMake build system improvements on Windows
 * Many ``mkdoc.py`` improvements (enumerations, template arguments, ``DOC()``
   macro accepts more arguments)
+* New ``pybind11::args`` and ``pybind11::kwargs`` types to create functions which
+  take an arbitrary number of arguments and keyword arguments
+* New syntax to call a Python function from C++ using ``*args`` and ``*kwargs``
+* Added an ``ExtraFlags`` template argument to the NumPy ``array_t<>`` wrapper. This
+  can be used to disable an enforced cast that may lose precision
 * Documentation improvements (pickling support, ``keep_alive``)
 
 1.7 (April 30, 2016)

docs/conf.py

@@ -56,9 +56,9 @@ author = 'Wenzel Jakob'
 # built documents.
 #
 # The short X.Y version.
-version = '1.0'
+version = '1.8'
 # The full version, including alpha/beta/rc tags.
-release = '1.0'
+release = '1.8'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

docs/release.rst

@@ -2,7 +2,8 @@ To release a new version of pybind11:
 
 - Update the version number and push to pypi
     - Update ``pybind11/_version.py`` (set release version, remove 'dev')
-    - Tag release date in ``doc/changelog.rst``.
+    - Update version in ``docs/conf.py``
+    - Tag release date in ``docs/changelog.rst``.
     - ``git add`` and ``git commit``.
     - ``git tag -a vX.Y -m 'vX.Y release'``.
     - ``git push``

example/example11.cpp

@@ -27,8 +27,8 @@ py::object call_kw_func(py::function f) {
 }
 
 void args_function(py::args args) {
-    for (auto item : args)
-        std::cout << "got argument: " << item << std::endl;
+    for (size_t it=0; it<args.size(); ++it)
+        std::cout << "got argument: " << py::object(args[it]) << std::endl;
 }
 
 void args_kwargs_function(py::args args, py::kwargs kwargs) {

example/example11.ref

@@ -29,7 +29,7 @@ kw_func(x=5, y=10)
 kw_func(x=5, y=10)
 Caught expected exception: Incompatible function arguments. The following argument types are supported:
     1. (x : int = 100L, y : int = 200L) -> NoneType
-
+    Invoked with:
 kw_func4: 13 17 
 kw_func4: 1 2 3 
 kw_func(x=1234, y=5678)

example/example12.cpp

@@ -82,15 +82,11 @@ void runExample12Virtual(Example12 *ex) {
 }
 
 void init_ex12(py::module &m) {
-    /* Important: use the wrapper type as a template
-       argument to class_<>, but use the original name
-       to denote the type */
-    py::class_<PyExample12>(m, "Example12")
-        /* Declare that 'PyExample12' is really an alias for the original type 'Example12' */
-        .alias<Example12>()
+    /* Important: indicate the trampoline class PyExample12 using the third
+       argument to py::class_. The second argument with the unique pointer
+       is simply the default holder type used by pybind11. */
+    py::class_<Example12, std::unique_ptr<Example12>, PyExample12>(m, "Example12")
         .def(py::init<int>())
-        /* Copy constructor (not needed in this case, but should generally be declared in this way) */
-        .def(py::init<const PyExample12 &>())
         /* Reference original class in function definitions */
         .def("run", &Example12::run)
         .def("run_bool", &Example12::run_bool)

example/example12.ref

 Constructing Example12..
 Original implementation of Example12::run(state=10, value=20)
 30
-Caught expected exception: Tried to call pure virtual function "pure_virtual"
+Caught expected exception: Tried to call pure virtual function "Example12::pure_virtual"
 Constructing Example12..
 ExtendedExample12::run(20), calling parent..
 Original implementation of Example12::run(state=11, value=21)

example/example14.ref

@@ -11,7 +11,7 @@ Got void ptr : 0x7f9ba0f3c430
 Called Example1 destructor (0)
 Caught expected exception: Incompatible function arguments. The following argument types are supported:
     1. (capsule) -> NoneType
-
+    Invoked with: [1, 2, 3]
 None
 Got null str : 0x0
 <example.StringList object at 0x10d3277a0>

example/example5.ref

@@ -14,7 +14,7 @@ Polly is a parrot
 Molly is a dog
 The following error is expected: Incompatible function arguments. The following argument types are supported:
     1. (example.Dog) -> NoneType
-
+    Invoked with: <Pet object at 0>
 Callback function 1 called!
 False
 Callback function 2 called : Hello, x, True, 5

example/issues.cpp

@@ -42,8 +42,7 @@ void init_issues(py::module &m) {
         }
     };
 
-    py::class_<DispatchIssue> base(m2, "DispatchIssue");
-    base.alias<Base>()
+    py::class_<Base, std::unique_ptr<Base>, DispatchIssue>(m2, "DispatchIssue")
         .def(py::init<>())
         .def("dispatch", &Base::dispatch);
 
@@ -108,4 +107,28 @@ void init_issues(py::module &m) {
     // (no id): don't cast doubles to ints
     m2.def("expect_float", [](float f) { return f; });
     m2.def("expect_int", [](int i) { return i; });
+
+    // (no id): don't invoke Python dispatch code when instantiating C++
+    // classes that were not extended on the Python side
+    struct A {
+        virtual ~A() {}
+        virtual void f() { std::cout << "A.f()" << std::endl; }
+    };
+
+    struct PyA : A {
+        PyA() { std::cout << "PyA.PyA()" << std::endl; }
+
+        void f() override {
+            std::cout << "PyA.f()" << std::endl;
+            PYBIND11_OVERLOAD(void, A, f);
+        }
+    };
+
+    auto call_f = [](A *a) { a->f(); };
+
+	pybind11::class_<A, std::unique_ptr<A>, PyA>(m2, "A")
+	    .def(py::init<>())
+	    .def("f", &A::f);
+
+	 m2.def("call_f", call_f);
 }

example/issues.py

@@ -9,6 +9,7 @@ from example.issues import Placeholder, return_vec_of_reference_wrapper
 from example.issues import iterator_passthrough
 from example.issues import ElementList, ElementA, print_element
 from example.issues import expect_float, expect_int
+from example.issues import A, call_f
 import gc
 
 print_cchar("const char *")
@@ -55,3 +56,19 @@ except Exception as e:
     print("Failed as expected: " + str(e))
 
 print(expect_float(12))
+
+class B(A):
+    def __init__(self):
+        super(B, self).__init__()
+
+    def f(self):
+        print("In python f()")
+
+print("C++ version")
+a = A()
+call_f(a)
+
+print("Python version")
+b = B()
+call_f(b)
+

example/issues.ref

 const char *
 c
-Failed as expected: Tried to call pure virtual function "dispatch"
+Failed as expected: Tried to call pure virtual function "Base::dispatch"
 Yay..
 [Placeholder[1], Placeholder[2], Placeholder[3], Placeholder[4]]
 [3, 5, 7, 9, 11, 13, 15]
 0==0, 1==1, 2==2, 3==3, 4==4, 5==5, 6==6, 7==7, 8==8, 9==9, 
 Failed as expected: Incompatible function arguments. The following argument types are supported:
     1. (example.issues.ElementA) -> NoneType
-
+    Invoked with: None
 Failed as expected: Incompatible function arguments. The following argument types are supported:
     1. (int) -> int
-
+    Invoked with: 5.2
 12.0
+C++ version
+A.f()
+Python version
+PyA.PyA()
+PyA.f()
+In python f()

include/pybind11/attr.h

@@ -65,6 +65,7 @@ enum op_type : int;
 struct undefined_t;
 template <op_id id, op_type ot, typename L = undefined_t, typename R = undefined_t> struct op_;
 template <typename... Args> struct init;
+template <typename... Args> struct init_alias;
 inline void keep_alive_impl(int Nurse, int Patient, handle args, handle ret);
 
 /// Internal data structure which holds metadata about a keyword argument

include/pybind11/cast.h

@@ -660,7 +660,7 @@ public:
         std::get<1>(value).load(kwargs, convert);
         return true;
     }
- 
+
     static handle cast(const type &src, return_value_policy policy, handle parent) {
         return cast(src, policy, parent, typename make_index_sequence<size>::type());
     }

include/pybind11/eigen.h

@@ -133,7 +133,7 @@ struct type_caster<Type, typename std::enable_if<is_eigen_dense<Type>::value>::t
     operator Type*() { return &value; }
     operator Type&() { return value; }
 
-private:
+protected:
     template <typename T = Type, typename std::enable_if<T::RowsAtCompileTime == Eigen::Dynamic, int>::type = 0>
     static PYBIND11_DESCR rows() { return _("m"); }
     template <typename T = Type, typename std::enable_if<T::RowsAtCompileTime != Eigen::Dynamic, int>::type = 0>
@@ -143,7 +143,7 @@ private:
     template <typename T = Type, typename std::enable_if<T::ColsAtCompileTime != Eigen::Dynamic, int>::type = 0>
     static PYBIND11_DESCR cols() { return _<T::ColsAtCompileTime>(); }
 
-private:
+protected:
     Type value;
 };
 
@@ -269,7 +269,7 @@ struct type_caster<Type, typename std::enable_if<is_eigen_sparse<Type>::value>::
     operator Type*() { return &value; }
     operator Type&() { return value; }
 
-private:
+protected:
     Type value;
 };
 

include/pybind11/pybind11.h

@@ -422,6 +422,14 @@ protected:
                 msg += it2->signature;
                 msg += "\n";
             }
+            msg += "    Invoked with: ";
+            tuple args_(args, true);
+            for( std::size_t ti = 0; ti != args_.size(); ++ti)
+            {
+                msg += static_cast<std::string>(static_cast<object>(args_[ti]).str());
+                if ((ti + 1) != args_.size() )
+                    msg += ", ";
+            }
             PyErr_SetString(PyExc_TypeError, msg.c_str());
             return nullptr;
         } else if (!result) {
@@ -495,7 +503,7 @@ public:
 NAMESPACE_BEGIN(detail)
 /// Generic support for creating new Python heap types
 class generic_type : public object {
-    template <typename type, typename holder_type> friend class class_;
+    template <typename type, typename holder_type, typename type_alias> friend class class_;
 public:
     PYBIND11_OBJECT_DEFAULT(generic_type, object, PyType_Check)
 protected:
@@ -713,7 +721,7 @@ protected:
 };
 NAMESPACE_END(detail)
 
-template <typename type, typename holder_type = std::unique_ptr<type>>
+template <typename type, typename holder_type = std::unique_ptr<type>, typename type_alias = type>
 class class_ : public detail::generic_type {
 public:
     typedef detail::instance<type, holder_type> instance_type;
@@ -735,6 +743,11 @@ public:
         detail::process_attributes<Extra...>::init(extra..., &record);
 
         detail::generic_type::initialize(&record);
+
+        if (!std::is_same<type, type_alias>::value) {
+            auto &instances = pybind11::detail::get_internals().registered_types_cpp;
+            instances[std::type_index(typeid(type_alias))] = instances[std::type_index(typeid(type))];
+        }
     }
 
     template <typename Func, typename... Extra>
@@ -772,6 +785,12 @@ public:
         return *this;
     }
 
+    template <typename... Args, typename... Extra>
+    class_ &def(const detail::init_alias<Args...> &init, const Extra&... extra) {
+        init.template execute<type>(*this, extra...);
+        return *this;
+    }
+
     template <typename Func> class_& def_buffer(Func &&func) {
         struct capture { Func func; };
         capture *ptr = new capture { std::forward<Func>(func) };
@@ -848,11 +867,6 @@ public:
         return *this;
     }
 
-    template <typename target> class_ alias() {
-        auto &instances = pybind11::detail::get_internals().registered_types_cpp;
-        instances[std::type_index(typeid(target))] = instances[std::type_index(typeid(type))];
-        return *this;
-    }
 private:
     /// Initialize holder object, variant 1: object derives from enable_shared_from_this
     template <typename T>
@@ -951,9 +965,31 @@ private:
 
 NAMESPACE_BEGIN(detail)
 template <typename... Args> struct init {
-    template <typename Base, typename Holder, typename... Extra> void execute(pybind11::class_<Base, Holder> &class_, const Extra&... extra) const {
+    template <typename Base, typename Holder, typename Alias, typename... Extra,
+              typename std::enable_if<std::is_same<Base, Alias>::value, int>::type = 0>
+    void execute(pybind11::class_<Base, Holder, Alias> &class_, const Extra&... extra) const {
         /// Function which calls a specific C++ in-place constructor
-        class_.def("__init__", [](Base *instance, Args... args) { new (instance) Base(args...); }, extra...);
+        class_.def("__init__", [](Base *self_, Args... args) { new (self_) Base(args...); }, extra...);
+    }
+
+    template <typename Base, typename Holder, typename Alias, typename... Extra,
+              typename std::enable_if<!std::is_same<Base, Alias>::value &&
+                                       std::is_constructible<Base, Args...>::value, int>::type = 0>
+    void execute(pybind11::class_<Base, Holder, Alias> &class_, const Extra&... extra) const {
+        handle cl_type = class_;
+        class_.def("__init__", [cl_type](handle self_, Args... args) {
+                if (self_.get_type() == cl_type)
+                    new (self_.cast<Base *>()) Base(args...);
+                else
+                    new (self_.cast<Alias *>()) Alias(args...);
+            }, extra...);
+    }
+
+    template <typename Base, typename Holder, typename Alias, typename... Extra,
+              typename std::enable_if<!std::is_same<Base, Alias>::value &&
+                                      !std::is_constructible<Base, Args...>::value, int>::type = 0>
+    void execute(pybind11::class_<Base, Holder, Alias> &class_, const Extra&... extra) const {
+        class_.def("__init__", [](Alias *self, Args... args) { new (self) Alias(args...); }, extra...);
     }
 };
 
@@ -1038,6 +1074,11 @@ template <typename InputType, typename OutputType> void implicitly_convertible()
  *    can be handy to prevent cases where callbacks issued from an external
  *    thread would otherwise constantly construct and destroy thread state data
  *    structures.
+ *
+ * See the Python bindings of NanoGUI (http://github.com/wjakob/nanogui) for an
+ * example which uses features 2 and 3 to migrate the Python thread of
+ * execution to another thread (to run the event loop on the original thread,
+ * in this case).
  */
 
 class gil_scoped_acquire {
@@ -1176,19 +1217,25 @@ inline function get_overload(const void *this_ptr, const char *name)  {
     return overload;
 }
 
-#define PYBIND11_OVERLOAD_INT(ret_type, class_name, name, ...) { \
+#define PYBIND11_OVERLOAD_INT(ret_type, name, ...) { \
         pybind11::gil_scoped_acquire gil; \
-        pybind11::function overload = pybind11::get_overload(this, #name); \
+        pybind11::function overload = pybind11::get_overload(this, name); \
         if (overload) \
             return overload(__VA_ARGS__).template cast<ret_type>();  }
 
-#define PYBIND11_OVERLOAD(ret_type, class_name, name, ...) \
-    PYBIND11_OVERLOAD_INT(ret_type, class_name, name, __VA_ARGS__) \
-    return class_name::name(__VA_ARGS__)
+#define PYBIND11_OVERLOAD_NAME(ret_type, cname, name, fn, ...) \
+    PYBIND11_OVERLOAD_INT(ret_type, name, __VA_ARGS__) \
+    return cname::fn(__VA_ARGS__)
+
+#define PYBIND11_OVERLOAD_PURE_NAME(ret_type, cname, name, fn, ...) \
+    PYBIND11_OVERLOAD_INT(ret_type, name, __VA_ARGS__) \
+    pybind11::pybind11_fail("Tried to call pure virtual function \"" #cname "::" name "\"");
+
+#define PYBIND11_OVERLOAD(ret_type, cname, fn, ...) \
+    PYBIND11_OVERLOAD_NAME(ret_type, cname, #fn, fn, __VA_ARGS__)
 
-#define PYBIND11_OVERLOAD_PURE(ret_type, class_name, name, ...) \
-    PYBIND11_OVERLOAD_INT(ret_type, class_name, name, __VA_ARGS__) \
-    pybind11::pybind11_fail("Tried to call pure virtual function \"" #name "\"");
+#define PYBIND11_OVERLOAD_PURE(ret_type, cname, fn, ...) \
+    PYBIND11_OVERLOAD_PURE_NAME(ret_type, cname, #fn, fn, __VA_ARGS__)
 
 NAMESPACE_END(pybind11)
 

include/pybind11/pytypes.h

@@ -323,10 +323,10 @@ public:
     PYBIND11_OBJECT_DEFAULT(iterable, object, detail::PyIterable_Check)
 };
 
-inline detail::accessor handle::operator[](handle key) const { return detail::accessor(ptr(), key.ptr(), false); }
-inline detail::accessor handle::operator[](const char *key) const { return detail::accessor(ptr(), key, false); }
-inline detail::accessor handle::attr(handle key) const { return detail::accessor(ptr(), key.ptr(), true); }
-inline detail::accessor handle::attr(const char *key) const { return detail::accessor(ptr(), key, true); }
+inline detail::accessor handle::operator[](handle key) const { return detail::accessor(*this, key, false); }
+inline detail::accessor handle::operator[](const char *key) const { return detail::accessor(*this, key, false); }
+inline detail::accessor handle::attr(handle key) const { return detail::accessor(*this, key, true); }
+inline detail::accessor handle::attr(const char *key) const { return detail::accessor(*this, key, true); }
 inline iterator handle::begin() const { return iterator(PyObject_GetIter(ptr()), false); }
 inline iterator handle::end() const { return iterator(nullptr, false); }
 inline detail::args_proxy handle::operator*() const { return detail::args_proxy(*this); }
@@ -491,7 +491,7 @@ public:
         if (!m_ptr) pybind11_fail("Could not allocate tuple object!");
     }
     size_t size() const { return (size_t) PyTuple_Size(m_ptr); }
-    detail::tuple_accessor operator[](size_t index) const { return detail::tuple_accessor(ptr(), index); }
+    detail::tuple_accessor operator[](size_t index) const { return detail::tuple_accessor(*this, index); }
 };
 
 class dict : public object {
@@ -501,7 +501,7 @@ public:
         if (!m_ptr) pybind11_fail("Could not allocate dict object!");
     }
     size_t size() const { return (size_t) PyDict_Size(m_ptr); }
-    detail::dict_iterator begin() const { return (++detail::dict_iterator(ptr(), 0)); }
+    detail::dict_iterator begin() const { return (++detail::dict_iterator(*this, 0)); }
     detail::dict_iterator end() const { return detail::dict_iterator(); }
     void clear() const { PyDict_Clear(ptr()); }
 };
@@ -517,7 +517,7 @@ public:
     void append(const object &object) const { PyList_Append(m_ptr, object.ptr()); }
 };
 
-class args : public list { PYBIND11_OBJECT_DEFAULT(args, list, PyList_Check) };
+class args : public tuple { PYBIND11_OBJECT_DEFAULT(args, tuple, PyTuple_Check) };
 class kwargs : public dict { PYBIND11_OBJECT_DEFAULT(kwargs, dict, PyDict_Check)  };
 
 class set : public object {