xiaofeng@google.com
12 years ago
parent
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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// http://code.google.com/p/protobuf/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// from google3/util/gtl/stl_util-inl.h
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#ifndef GOOGLE_PROTOBUF_STUBS_STL_UTIL_INL_H__ |
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#define GOOGLE_PROTOBUF_STUBS_STL_UTIL_INL_H__ |
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#include <google/protobuf/stubs/common.h> |
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namespace google { |
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namespace protobuf { |
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// STLDeleteContainerPointers()
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// For a range within a container of pointers, calls delete
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// (non-array version) on these pointers.
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// NOTE: for these three functions, we could just implement a DeleteObject
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// functor and then call for_each() on the range and functor, but this
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// requires us to pull in all of algorithm.h, which seems expensive.
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// For hash_[multi]set, it is important that this deletes behind the iterator
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// because the hash_set may call the hash function on the iterator when it is
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// advanced, which could result in the hash function trying to deference a
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// stale pointer.
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template <class ForwardIterator> |
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void STLDeleteContainerPointers(ForwardIterator begin, |
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ForwardIterator end) { |
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while (begin != end) { |
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ForwardIterator temp = begin; |
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++begin; |
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delete *temp; |
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} |
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} |
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// Inside Google, this function implements a horrible, disgusting hack in which
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// we reach into the string's private implementation and resize it without
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// initializing the new bytes. In some cases doing this can significantly
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// improve performance. However, since it's totally non-portable it has no
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// place in open source code. Feel free to fill this function in with your
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// own disgusting hack if you want the perf boost.
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inline void STLStringResizeUninitialized(string* s, size_t new_size) { |
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s->resize(new_size); |
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} |
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// Return a mutable char* pointing to a string's internal buffer,
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// which may not be null-terminated. Writing through this pointer will
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// modify the string.
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//
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// string_as_array(&str)[i] is valid for 0 <= i < str.size() until the
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// next call to a string method that invalidates iterators.
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//
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// As of 2006-04, there is no standard-blessed way of getting a
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// mutable reference to a string's internal buffer. However, issue 530
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// (http://www.open-std.org/JTC1/SC22/WG21/docs/lwg-active.html#530)
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// proposes this as the method. According to Matt Austern, this should
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// already work on all current implementations.
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inline char* string_as_array(string* str) { |
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// DO NOT USE const_cast<char*>(str->data())! See the unittest for why.
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return str->empty() ? NULL : &*str->begin(); |
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} |
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// STLDeleteElements() deletes all the elements in an STL container and clears
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// the container. This function is suitable for use with a vector, set,
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// hash_set, or any other STL container which defines sensible begin(), end(),
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// and clear() methods.
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//
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// If container is NULL, this function is a no-op.
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//
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// As an alternative to calling STLDeleteElements() directly, consider
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// ElementDeleter (defined below), which ensures that your container's elements
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// are deleted when the ElementDeleter goes out of scope.
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template <class T> |
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void STLDeleteElements(T *container) { |
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if (!container) return; |
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STLDeleteContainerPointers(container->begin(), container->end()); |
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container->clear(); |
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} |
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// Given an STL container consisting of (key, value) pairs, STLDeleteValues
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// deletes all the "value" components and clears the container. Does nothing
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// in the case it's given a NULL pointer.
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template <class T> |
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void STLDeleteValues(T *v) { |
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if (!v) return; |
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for (typename T::iterator i = v->begin(); i != v->end(); ++i) { |
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delete i->second; |
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} |
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v->clear(); |
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} |
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} // namespace protobuf
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} // namespace google
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#endif // GOOGLE_PROTOBUF_STUBS_STL_UTIL_INL_H__
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