cefpython/src/include/internal/cef_ptr.h at cefpython57 · pythonthings/cefpython · GitHub

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// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are

// met:

// * Redistributions of source code must retain the above copyright

// notice, this list of conditions and the following disclaimer.

// * Redistributions in binary form must reproduce the above

// copyright notice, this list of conditions and the following disclaimer

// in the documentation and/or other materials provided with the

// distribution.

// * Neither the name of Google Inc. nor the name Chromium Embedded

// Framework nor the names of its contributors may be used to endorse

// or promote products derived from this software without specific prior

// written permission.

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef CEF_INCLUDE_INTERNAL_CEF_PTR_H_

#define CEF_INCLUDE_INTERNAL_CEF_PTR_H_

#pragma once

#include "include/base/cef_build.h"

#include "include/base/cef_ref_counted.h"

#if defined(USING_CHROMIUM_INCLUDES)

#include <memory> // For std::unique_ptr.

#else

#include "include/base/cef_scoped_ptr.h"

#endif

///

// Smart pointer implementation that is an alias of scoped_refptr from

// include/base/cef_ref_counted.h.

// <p>

// A smart pointer class for reference counted objects. Use this class instead

// of calling AddRef and Release manually on a reference counted object to

// avoid common memory leaks caused by forgetting to Release an object

// reference. Sample usage:

// <pre>

// class MyFoo : public CefBaseRefCounted {

// ...

// };

// void some_function() {

// // The MyFoo object that |foo| represents starts with a single

// // reference.

// CefRefPtr<MyFoo> foo = new MyFoo();

// foo->Method(param);

// // |foo| is released when this function returns

// }

// void some_other_function() {

// CefRefPtr<MyFoo> foo = new MyFoo();

// ...

// foo = NULL; // explicitly releases |foo|

// ...

// if (foo)

// foo->Method(param);

// }

// </pre>

// The above examples show how CefRefPtr<T> acts like a pointer to T.

// Given two CefRefPtr<T> classes, it is also possible to exchange

// references between the two objects, like so:

// <pre>

// {

// CefRefPtr<MyFoo> a = new MyFoo();

// CefRefPtr<MyFoo> b;

// b.swap(a);

// // now, |b| references the MyFoo object, and |a| references NULL.

// }

// </pre>

// To make both |a| and |b| in the above example reference the same MyFoo

// object, simply use the assignment operator:

// <pre>

// {

// CefRefPtr<MyFoo> a = new MyFoo();

// CefRefPtr<MyFoo> b;

// b = a;

// // now, |a| and |b| each own a reference to the same MyFoo object.

// // the reference count of the underlying MyFoo object will be 2.

// }

// </pre>

// Reference counted objects can also be passed as function parameters and

// used as function return values:

// <pre>

// void some_func_with_param(CefRefPtr<MyFoo> param) {

// // A reference is added to the MyFoo object that |param| represents

// // during the scope of some_func_with_param() and released when

// // some_func_with_param() goes out of scope.

// }

// CefRefPtr<MyFoo> some_func_with_retval() {

// // The MyFoo object that |foox| represents starts with a single

// // reference.

// CefRefPtr<MyFoo> foox = new MyFoo();

// // Creating the return value adds an additional reference.

// return foox;

// // When some_func_with_retval() goes out of scope the original |foox|

// // reference is released.

// }

// void and_another_function() {

// CefRefPtr<MyFoo> foo = new MyFoo();

// // pass |foo| as a parameter.

// some_function(foo);

// CefRefPtr<MyFoo> foo2 = some_func_with_retval();

// // Now, since we kept a reference to the some_func_with_retval() return

// // value, |foo2| is the only class pointing to the MyFoo object created

// in some_func_with_retval(), and it has a reference count of 1.

// some_func_with_retval();

// // Now, since we didn't keep a reference to the some_func_with_retval()

// // return value, the MyFoo object created in some_func_with_retval()

// // will automatically be released.

// }

// </pre>

// And in standard containers:

// <pre>

// {

// // Create a vector that holds MyFoo objects.

// std::vector<CefRefPtr<MyFoo> > MyFooVec;

// // The MyFoo object that |foo| represents starts with a single

// // reference.

// CefRefPtr<MyFoo> foo = new MyFoo();

// // When the MyFoo object is added to |MyFooVec| the reference count

// // is increased to 2.

// MyFooVec.push_back(foo);

// }

// </pre>

// </p>

///

#if defined(HAS_CPP11_TEMPLATE_ALIAS_SUPPORT)

template <class T>

using CefRefPtr = scoped_refptr<T>;

#else

// When template aliases are not supported use a define instead of subclassing

// because it's otherwise hard to get the constructors to behave correctly.

#define CefRefPtr scoped_refptr

#endif

///

// A CefOwnPtr<T> is like a T*, except that the destructor of CefOwnPtr<T>

// automatically deletes the pointer it holds (if any). That is, CefOwnPtr<T>

// owns the T object that it points to. Like a T*, a CefOwnPtr<T> may hold

// either NULL or a pointer to a T object. Also like T*, CefOwnPtr<T> is

// thread-compatible, and once you dereference it, you get the thread safety

// guarantees of T.

///

#if defined(USING_CHROMIUM_INCLUDES)

// Implementation-side code uses std::unique_ptr instead of scoped_ptr.

template <class T, class D = std::default_delete<T>>

using CefOwnPtr = std::unique_ptr<T, D>;

#elif defined(HAS_CPP11_TEMPLATE_ALIAS_SUPPORT)

template <class T, class D = base::DefaultDeleter<T>>

using CefOwnPtr = scoped_ptr<T, D>;

#else

// When template aliases are not supported use a define instead of subclassing

// because it's otherwise hard to get the constructors to behave correctly.

#define CefOwnPtr scoped_ptr

#endif

///

// A CefRawPtr<T> is the same as T*

///

#if defined(HAS_CPP11_TEMPLATE_ALIAS_SUPPORT)

template <class T>

using CefRawPtr = T*;

#else

// Simple wrapper implementation that behaves as much like T* as possible.

template <class T>

class CefRawPtr {

public:

CefRawPtr() : ptr_(nullptr) {}

CefRawPtr(T* p) : ptr_(p) {}

CefRawPtr(const CefRawPtr& r) : ptr_(r.ptr_) {}

template <typename U>

CefRawPtr(const CefRawPtr<U>& r) : ptr_(r.get()) {}

T* get() const { return ptr_; }

// Allow CefRawPtr to be used in boolean expression and comparison operations.

operator T*() const { return ptr_; }

T* operator->() const {

assert(ptr_ != NULL);

return ptr_;

}

CefRawPtr<T>& operator=(T* p) {

ptr_ = p;

return *this;

}

CefRawPtr<T>& operator=(const CefRawPtr<T>& r) {

return *this = r.ptr_;

}

template <typename U>

CefRawPtr<T>& operator=(const CefRawPtr<U>& r) {

return *this = r.get();

}

private:

T* ptr_;

};

#endif

#endif // CEF_INCLUDE_INTERNAL_CEF_PTR_H_

cefpython/src/include/internal/cef_ptr.h at cefpython57 · pythonthings/cefpython · GitHub

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