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author | Patrick Scott <phanna@android.com> | 2010-02-04 10:37:17 -0500 |
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committer | Patrick Scott <phanna@android.com> | 2010-02-04 10:39:42 -0500 |
commit | c7f5f8508d98d5952d42ed7648c2a8f30a4da156 (patch) | |
tree | dd51dbfbf6670daa61279b3a19e7b1835b301dbf /googleurl/base/scoped_ptr.h | |
parent | 139d8152182f9093f03d9089822b688e49fa7667 (diff) | |
download | external_chromium-c7f5f8508d98d5952d42ed7648c2a8f30a4da156.zip external_chromium-c7f5f8508d98d5952d42ed7648c2a8f30a4da156.tar.gz external_chromium-c7f5f8508d98d5952d42ed7648c2a8f30a4da156.tar.bz2 |
Initial source checkin.
The source files were determined by building net_unittests in chromium's source
tree. Some of the obvious libraries were left out (v8, gmock, gtest).
The Android.mk file has all the sources (minus unittests and tools) that were
used during net_unittests compilation. Nothing builds yet because of STL but
that is the next task. The .cpp files will most likely not compile anyways
because of the LOCAL_CPP_EXTENSION mod. I will have to break this into multiple
projects to get around that limitation.
Diffstat (limited to 'googleurl/base/scoped_ptr.h')
-rw-r--r-- | googleurl/base/scoped_ptr.h | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/googleurl/base/scoped_ptr.h b/googleurl/base/scoped_ptr.h new file mode 100644 index 0000000..de0b388 --- /dev/null +++ b/googleurl/base/scoped_ptr.h @@ -0,0 +1,322 @@ +#ifndef BASE_SCOPED_PTR_H +#define BASE_SCOPED_PTR_H + +// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999. +// Copyright (c) 2001, 2002 Peter Dimov +// +// Permission to copy, use, modify, sell and distribute this software +// is granted provided this copyright notice appears in all copies. +// This software is provided "as is" without express or implied +// warranty, and with no claim as to its suitability for any purpose. +// +// See http://www.boost.org/libs/smart_ptr/scoped_ptr.htm for documentation. +// + +// scoped_ptr mimics a built-in pointer except that it guarantees deletion +// of the object pointed to, either on destruction of the scoped_ptr or via +// an explicit reset(). scoped_ptr is a simple solution for simple needs; +// use shared_ptr or std::auto_ptr if your needs are more complex. + +// *** NOTE *** +// If your scoped_ptr is a class member of class FOO pointing to a +// forward declared type BAR (as shown below), then you MUST use a non-inlined +// version of the destructor. The destructor of a scoped_ptr (called from +// FOO's destructor) must have a complete definition of BAR in order to +// destroy it. Example: +// +// -- foo.h -- +// class BAR; +// +// class FOO { +// public: +// FOO(); +// ~FOO(); // Required for sources that instantiate class FOO to compile! +// +// private: +// scoped_ptr<BAR> bar_; +// }; +// +// -- foo.cc -- +// #include "foo.h" +// FOO::~FOO() {} // Empty, but must be non-inlined to FOO's class definition. + +#include <cstddef> // for std::ptrdiff_t +#include <assert.h> // for assert +#include <stdlib.h> // for free() decl + +template <typename T> +class scoped_ptr { + private: + + T* ptr; + + scoped_ptr(scoped_ptr const &); + scoped_ptr & operator=(scoped_ptr const &); + + public: + + typedef T element_type; + + explicit scoped_ptr(T* p = 0): ptr(p) {} + + ~scoped_ptr() { + typedef char type_must_be_complete[sizeof(T)]; + delete ptr; + } + + void reset(T* p = 0) { + typedef char type_must_be_complete[sizeof(T)]; + + if (ptr != p) { + delete ptr; + ptr = p; + } + } + + T& operator*() const { + assert(ptr != 0); + return *ptr; + } + + T* operator->() const { + assert(ptr != 0); + return ptr; + } + + bool operator==(T* p) const { + return ptr == p; + } + + bool operator!=(T* p) const { + return ptr != p; + } + + T* get() const { + return ptr; + } + + void swap(scoped_ptr & b) { + T* tmp = b.ptr; + b.ptr = ptr; + ptr = tmp; + } + + T* release() { + T* tmp = ptr; + ptr = 0; + return tmp; + } + + private: + + // no reason to use these: each scoped_ptr should have its own object + template <typename U> bool operator==(scoped_ptr<U> const& p) const; + template <typename U> bool operator!=(scoped_ptr<U> const& p) const; +}; + +template<typename T> inline +void swap(scoped_ptr<T>& a, scoped_ptr<T>& b) { + a.swap(b); +} + +template<typename T> inline +bool operator==(T* p, const scoped_ptr<T>& b) { + return p == b.get(); +} + +template<typename T> inline +bool operator!=(T* p, const scoped_ptr<T>& b) { + return p != b.get(); +} + +// scoped_array extends scoped_ptr to arrays. Deletion of the array pointed to +// is guaranteed, either on destruction of the scoped_array or via an explicit +// reset(). Use shared_array or std::vector if your needs are more complex. + +template<typename T> +class scoped_array { + private: + + T* ptr; + + scoped_array(scoped_array const &); + scoped_array & operator=(scoped_array const &); + + public: + + typedef T element_type; + + explicit scoped_array(T* p = 0) : ptr(p) {} + + ~scoped_array() { + typedef char type_must_be_complete[sizeof(T)]; + delete[] ptr; + } + + void reset(T* p = 0) { + typedef char type_must_be_complete[sizeof(T)]; + + if (ptr != p) { + delete [] ptr; + ptr = p; + } + } + + T& operator[](std::ptrdiff_t i) const { + assert(ptr != 0); + assert(i >= 0); + return ptr[i]; + } + + bool operator==(T* p) const { + return ptr == p; + } + + bool operator!=(T* p) const { + return ptr != p; + } + + T* get() const { + return ptr; + } + + void swap(scoped_array & b) { + T* tmp = b.ptr; + b.ptr = ptr; + ptr = tmp; + } + + T* release() { + T* tmp = ptr; + ptr = 0; + return tmp; + } + + private: + + // no reason to use these: each scoped_array should have its own object + template <typename U> bool operator==(scoped_array<U> const& p) const; + template <typename U> bool operator!=(scoped_array<U> const& p) const; +}; + +template<class T> inline +void swap(::scoped_array<T>& a, ::scoped_array<T>& b) { + a.swap(b); +} + +template<typename T> inline +bool operator==(T* p, const ::scoped_array<T>& b) { + return p == b.get(); +} + +template<typename T> inline +bool operator!=(T* p, const ::scoped_array<T>& b) { + return p != b.get(); +} + + +// This class wraps the c library function free() in a class that can be +// passed as a template argument to scoped_ptr_malloc below. +class ScopedPtrMallocFree { + public: + inline void operator()(void* x) const { + free(x); + } +}; + +// scoped_ptr_malloc<> is similar to scoped_ptr<>, but it accepts a +// second template argument, the functor used to free the object. + +template<typename T, typename FreeProc = ScopedPtrMallocFree> +class scoped_ptr_malloc { + private: + + T* ptr; + + scoped_ptr_malloc(scoped_ptr_malloc const &); + scoped_ptr_malloc & operator=(scoped_ptr_malloc const &); + + public: + + typedef T element_type; + + explicit scoped_ptr_malloc(T* p = 0): ptr(p) {} + + ~scoped_ptr_malloc() { + typedef char type_must_be_complete[sizeof(T)]; + free_((void*) ptr); + } + + void reset(T* p = 0) { + typedef char type_must_be_complete[sizeof(T)]; + + if (ptr != p) { + free_((void*) ptr); + ptr = p; + } + } + + T& operator*() const { + assert(ptr != 0); + return *ptr; + } + + T* operator->() const { + assert(ptr != 0); + return ptr; + } + + bool operator==(T* p) const { + return ptr == p; + } + + bool operator!=(T* p) const { + return ptr != p; + } + + T* get() const { + return ptr; + } + + void swap(scoped_ptr_malloc & b) { + T* tmp = b.ptr; + b.ptr = ptr; + ptr = tmp; + } + + T* release() { + T* tmp = ptr; + ptr = 0; + return tmp; + } + + private: + + // no reason to use these: each scoped_ptr_malloc should have its own object + template <typename U, typename GP> + bool operator==(scoped_ptr_malloc<U, GP> const& p) const; + template <typename U, typename GP> + bool operator!=(scoped_ptr_malloc<U, GP> const& p) const; + + static FreeProc const free_; +}; + +template<typename T, typename FP> +FP const scoped_ptr_malloc<T,FP>::free_ = FP(); + +template<typename T, typename FP> inline +void swap(scoped_ptr_malloc<T,FP>& a, scoped_ptr_malloc<T,FP>& b) { + a.swap(b); +} + +template<typename T, typename FP> inline +bool operator==(T* p, const scoped_ptr_malloc<T,FP>& b) { + return p == b.get(); +} + +template<typename T, typename FP> inline +bool operator!=(T* p, const scoped_ptr_malloc<T,FP>& b) { + return p != b.get(); +} + +#endif // #ifndef BASE_SCOPED_PTR_H |