src: mark methods of wrapper classes const

PR-URL: nodejs/node-addon-api#874
Reviewed-By: Gabriel Schulhof <gabrielschulhof@gmail.com>
Reviewed-By: Michael Dawson <midawson@redhat.com

doc/env.md

@@ -57,15 +57,15 @@ Returns a `bool` indicating if an exception is pending in the environment.
 ### GetAndClearPendingException
 
 ```cpp
-Napi::Error Napi::Env::GetAndClearPendingException();
+Napi::Error Napi::Env::GetAndClearPendingException() const;
 ```
 
 Returns an `Napi::Error` object representing the environment's pending exception, if any.
 
 ### RunScript
 
 ```cpp
-Napi::Value Napi::Env::RunScript(____ script);
+Napi::Value Napi::Env::RunScript(____ script) const;
 ```
 - `[in] script`: A string containing JavaScript code to execute.
 
@@ -78,7 +78,7 @@ The `script` can be any of the following types:
 
 ### GetInstanceData
 ```cpp
-template <typename T> T* GetInstanceData();
+template <typename T> T* GetInstanceData() const;
 ```
 
 Returns the instance data that was previously associated with the environment,
@@ -89,7 +89,7 @@ or `nullptr` if none was associated.
 ```cpp
 template <typename T> using Finalizer = void (*)(Env, T*);
 template <typename T, Finalizer<T> fini = Env::DefaultFini<T>>
-void SetInstanceData(T* data);
+void SetInstanceData(T* data) const;
 ```
 
 - `[template] fini`: A function to call when the instance data is to be deleted.
@@ -112,7 +112,7 @@ template <typename DataType,
           typename HintType,
           FinalizerWithHint<DataType, HintType> fini =
             Env::DefaultFiniWithHint<DataType, HintType>>
-void SetInstanceData(DataType* data, HintType* hint);
+void SetInstanceData(DataType* data, HintType* hint) const;
 ```
 
 - `[template] fini`: A function to call when the instance data is to be deleted.

doc/object.md

@@ -72,7 +72,7 @@ Creates a new `Napi::Object` value.
 ### Set()
 
 ```cpp
-bool Napi::Object::Set (____ key, ____ value);
+bool Napi::Object::Set (____ key, ____ value) const;
 ```
 - `[in] key`: The name for the property being assigned.
 - `[in] value`: The value being assigned to the property.
@@ -91,7 +91,7 @@ The `value` can be of any type that is accepted by [`Napi::Value::From`][].
 ### Delete()
 
 ```cpp
-bool Napi::Object::Delete(____ key);
+bool Napi::Object::Delete(____ key) const;
 ```
 - `[in] key`: The name of the property to delete.
 
@@ -143,7 +143,7 @@ Note: This is equivalent to the JavaScript instanceof operator.
 ### AddFinalizer()
 ```cpp
 template <typename Finalizer, typename T>
-inline void AddFinalizer(Finalizer finalizeCallback, T* data);
+inline void AddFinalizer(Finalizer finalizeCallback, T* data) const;
 ```
 
 - `[in] finalizeCallback`: The function to call when the object is garbage-collected.
@@ -161,7 +161,7 @@ where `data` is the pointer that was passed into the call to `AddFinalizer()`.
 template <typename Finalizer, typename T, typename Hint>
 inline void AddFinalizer(Finalizer finalizeCallback,
                          T* data,
-                         Hint* finalizeHint);
+                         Hint* finalizeHint) const;
 ```
 
 - `[in] data`: The data to associate with the object.
@@ -184,7 +184,7 @@ The properties whose key is a `Symbol` will not be included.
 
 ### HasOwnProperty()
 ```cpp
-bool Napi::Object::HasOwnProperty(____ key); const
+bool Napi::Object::HasOwnProperty(____ key) const;
 ```
 - `[in] key` The name of the property to check.
 
@@ -200,7 +200,7 @@ The key can be any of the following types:
 ### DefineProperty()
 
 ```cpp
-bool Napi::Object::DefineProperty (const Napi::PropertyDescriptor& property);
+bool Napi::Object::DefineProperty (const Napi::PropertyDescriptor& property) const;
 ```
 - `[in] property`: A [`Napi::PropertyDescriptor`](property_descriptor.md).
 
@@ -209,7 +209,7 @@ Define a property on the object.
 ### DefineProperties()
 
 ```cpp
-bool Napi::Object::DefineProperties (____ properties)
+bool Napi::Object::DefineProperties (____ properties) const;
 ```
 - `[in] properties`: A list of [`Napi::PropertyDescriptor`](property_descriptor.md). Can be one of the following types:
   - const std::initializer_list<Napi::PropertyDescriptor>&
@@ -220,7 +220,7 @@ Defines properties on the object.
 ### Freeze()
 
 ```cpp
-void Napi::Object::Freeze()
+void Napi::Object::Freeze() const;
 ```
 
 The `Napi::Object::Freeze()` method freezes an object. A frozen object can no
@@ -233,7 +233,7 @@ freezing an object also prevents its prototype from being changed.
 ### Seal()
 
 ```cpp
-void Napi::Object::Seal()
+void Napi::Object::Seal() const;
 ```
 
 The `Napi::Object::Seal()` method seals an object, preventing new properties
@@ -244,50 +244,29 @@ writable.
 ### operator\[\]()
 
 ```cpp
-Napi::PropertyLValue<std::string> Napi::Object::operator[] (const char* utf8name);
+Napi::PropertyLValue<std::string> Napi::Object::operator[] (const char* utf8name) const;
 ```
 - `[in] utf8name`: UTF-8 encoded null-terminated property name.
 
 Returns a [`Napi::Object::PropertyLValue`](propertylvalue.md) as the named
 property or sets the named property.
 
 ```cpp
-Napi::PropertyLValue<std::string> Napi::Object::operator[] (const std::string& utf8name);
+Napi::PropertyLValue<std::string> Napi::Object::operator[] (const std::string& utf8name) const;
 ```
 - `[in] utf8name`: UTF-8 encoded property name.
 
 Returns a [`Napi::Object::PropertyLValue`](propertylvalue.md) as the named
 property or sets the named property.
 
 ```cpp
-Napi::PropertyLValue<uint32_t> Napi::Object::operator[] (uint32_t index);
+Napi::PropertyLValue<uint32_t> Napi::Object::operator[] (uint32_t index) const;
 ```
 - `[in] index`: Element index.
 
 Returns a [`Napi::Object::PropertyLValue`](propertylvalue.md) or sets an
 indexed property or array element.
 
-```cpp
-Napi::Value Napi::Object::operator[] (const char* utf8name) const;
-```
-- `[in] utf8name`: UTF-8 encoded null-terminated property name.
-
-Returns the named property as a [`Napi::Value`](value.md).
-
-```cpp
-Napi::Value Napi::Object::operator[] (const std::string& utf8name) const;
-```
-- `[in] utf8name`: UTF-8 encoded property name.
-
-Returns the named property as a [`Napi::Value`](value.md).
-
-```cpp
-Napi::Value Napi::Object::operator[] (uint32_t index) const;
-```
-- `[in] index`: Element index.
-
-Returns an indexed property or array element as a [`Napi::Value`](value.md).
-
 ### begin()
 
 ```cpp

doc/object_reference.md

@@ -103,7 +103,7 @@ The `value` can be any of the following types:
 ### Get
 
 ```cpp
-Napi::Value Napi::ObjectReference::Get(___ key);
+Napi::Value Napi::ObjectReference::Get(___ key) const;
 ```
 
 * `[in] key`: The name of the property to return the value for.

doc/reference.md

@@ -69,15 +69,15 @@ Returns the value held by the `Napi::Reference`.
 ### Ref
 
 ```cpp
-uint32_t Napi::Reference::Ref();
+uint32_t Napi::Reference::Ref() const;
 ```
 
 Increments the reference count for the `Napi::Reference` and returns the resulting reference count. Throws an error if the increment fails.
 
 ### Unref
 
 ```cpp
-uint32_t Napi::Reference::Unref();
+uint32_t Napi::Reference::Unref() const;
 ```
 
 Decrements the reference count for the `Napi::Reference` and returns the resulting reference count. Throws an error if the decrement fails.

doc/threadsafe_function.md

@@ -83,7 +83,7 @@ Add a thread to this thread-safe function object, indicating that a new thread
 will start making use of the thread-safe function.
 
 ```cpp
-napi_status Napi::ThreadSafeFunction::Acquire()
+napi_status Napi::ThreadSafeFunction::Acquire() const
 ```
 
 Returns one of:
@@ -100,7 +100,7 @@ thread-safe function. Using any thread-safe APIs after having called this API
 has undefined results in the current thread, as it may have been destroyed.
 
 ```cpp
-napi_status Napi::ThreadSafeFunction::Release()
+napi_status Napi::ThreadSafeFunction::Release() const
 ```
 
 Returns one of:
@@ -122,7 +122,7 @@ make no further use of the thread-safe function because it is no longer
 guaranteed to be allocated.
 
 ```cpp
-napi_status Napi::ThreadSafeFunction::Abort()
+napi_status Napi::ThreadSafeFunction::Abort() const
 ```
 
 Returns one of:

doc/typed_threadsafe_function.md

@@ -124,7 +124,7 @@ has undefined results in the current thread, as the thread-safe function may
 have been destroyed.
 
 ```cpp
-napi_status Napi::TypedThreadSafeFunction<ContextType, DataType, Callback>::Release()
+napi_status Napi::TypedThreadSafeFunction<ContextType, DataType, Callback>::Release() const
 ```
 
 Returns one of:
@@ -146,7 +146,7 @@ function call a thread must make no further use of the thread-safe function
 because it is no longer guaranteed to be allocated.
 
 ```cpp
-napi_status Napi::TypedThreadSafeFunction<ContextType, DataType, Callback>::Abort()
+napi_status Napi::TypedThreadSafeFunction<ContextType, DataType, Callback>::Abort() const
 ```
 
 Returns one of: