Docs: Fix several errors of examples from the doc (#592)

* [Doc] Fix several errors of examples from the doc

* Add missing operator def.

* Added missing `()`

* Add missing `namespace`.

docs/advanced/cast/stl.rst

@@ -72,7 +72,7 @@ functions:
     /* ... binding code ... */
 
     py::class_<MyClass>(m, "MyClass")
-        .def(py::init<>)
+        .def(py::init<>())
         .def_readwrite("contents", &MyClass::contents);
 
 In this case, properties can be read and written in their entirety. However, an

docs/advanced/classes.rst

@@ -186,7 +186,7 @@ example as follows:
         virtual std::string go(int n_times) = 0;
         virtual std::string name() { return "unknown"; }
     };
-    class Dog : public class Animal {
+    class Dog : public Animal {
     public:
         std::string go(int n_times) override {
             std::string result;
@@ -228,7 +228,8 @@ declare or override any virtual methods itself:
 
     class Husky : public Dog {};
     class PyHusky : public Husky {
-        using Dog::Dog; // Inherit constructors
+    public:
+        using Husky::Husky; // Inherit constructors
         std::string go(int n_times) override { PYBIND11_OVERLOAD_PURE(std::string, Husky, go, n_times); }
         std::string name() override { PYBIND11_OVERLOAD(std::string, Husky, name, ); }
         std::string bark() override { PYBIND11_OVERLOAD(std::string, Husky, bark, ); }
@@ -242,11 +243,13 @@ follows:
 .. code-block:: cpp
 
     template <class AnimalBase = Animal> class PyAnimal : public AnimalBase {
+    public:
         using AnimalBase::AnimalBase; // Inherit constructors
         std::string go(int n_times) override { PYBIND11_OVERLOAD_PURE(std::string, AnimalBase, go, n_times); }
         std::string name() override { PYBIND11_OVERLOAD(std::string, AnimalBase, name, ); }
     };
     template <class DogBase = Dog> class PyDog : public PyAnimal<DogBase> {
+    public:
         using PyAnimal<DogBase>::PyAnimal; // Inherit constructors
         // Override PyAnimal's pure virtual go() with a non-pure one:
         std::string go(int n_times) override { PYBIND11_OVERLOAD(std::string, DogBase, go, n_times); }
@@ -373,7 +376,7 @@ crucial that instances are deallocated on the C++ side to avoid memory leaks.
     /* ... binding code ... */
 
     py::class_<MyClass, std::unique_ptr<MyClass, py::nodelete>>(m, "MyClass")
-        .def(py::init<>)
+        .def(py::init<>())
 
 Implicit conversions
 ====================
@@ -487,6 +490,7 @@ to Python.
             .def(py::self += py::self)
             .def(py::self *= float())
             .def(float() * py::self)
+            .def(py::self * float())
             .def("__repr__", &Vector2::toString);
 
         return m.ptr();

docs/advanced/functions.rst

@@ -207,8 +207,8 @@ For instance, the following statement iterates over a Python ``dict``:
     void print_dict(py::dict dict) {
         /* Easily interact with Python types */
         for (auto item : dict)
-            std::cout << "key=" << item.first << ", "
-                      << "value=" << item.second << std::endl;
+            std::cout << "key=" << std::string(py::str(item.first)) << ", "
+                      << "value=" << std::string(py::str(item.second)) << std::endl;
     }
 
 It can be exported:

docs/advanced/pycpp/object.rst

@@ -57,7 +57,7 @@ In C++, the same call can be made using:
 
 .. code-block:: cpp
 
-    using pybind11::literals; // to bring in the `_a` literal
+    using namespace pybind11::literals; // to bring in the `_a` literal
     f(1234, "say"_a="hello", "to"_a=some_instance); // keyword call in C++
 
 Unpacking of ``*args`` and ``**kwargs`` is also possible and can be mixed with

docs/classes.rst

@@ -298,8 +298,8 @@ different kinds of input arguments:
     struct Pet {
         Pet(const std::string &name, int age) : name(name), age(age) { }
 
-        void set(int age) { age = age; }
-        void set(const std::string &name) { name = name; }
+        void set(int age_) { age = age_; }
+        void set(const std::string &name_) { name = name_; }
 
         std::string name;
         int age;