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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_RUNTIME_BASE_STL_UTIL_H_
#define ART_RUNTIME_BASE_STL_UTIL_H_
#include <algorithm>
#include <sstream>
namespace art {
// Sort and remove duplicates of an STL vector or deque.
template<class T>
void STLSortAndRemoveDuplicates(T* v) {
std::sort(v->begin(), v->end());
v->erase(std::unique(v->begin(), v->end()), v->end());
}
// STLDeleteContainerPointers()
// For a range within a container of pointers, calls delete
// (non-array version) on these pointers.
// NOTE: for these three functions, we could just implement a DeleteObject
// functor and then call for_each() on the range and functor, but this
// requires us to pull in all of algorithm.h, which seems expensive.
// For hash_[multi]set, it is important that this deletes behind the iterator
// because the hash_set may call the hash function on the iterator when it is
// advanced, which could result in the hash function trying to deference a
// stale pointer.
template <class ForwardIterator>
void STLDeleteContainerPointers(ForwardIterator begin,
ForwardIterator end) {
while (begin != end) {
ForwardIterator temp = begin;
++begin;
delete *temp;
}
}
// STLDeleteElements() deletes all the elements in an STL container and clears
// the container. This function is suitable for use with a vector, set,
// hash_set, or any other STL container which defines sensible begin(), end(),
// and clear() methods.
//
// If container is null, this function is a no-op.
//
// As an alternative to calling STLDeleteElements() directly, consider
// using a container of std::unique_ptr, which ensures that your container's
// elements are deleted when the container goes out of scope.
template <class T>
void STLDeleteElements(T *container) {
if (container != nullptr) {
STLDeleteContainerPointers(container->begin(), container->end());
container->clear();
}
}
// Given an STL container consisting of (key, value) pairs, STLDeleteValues
// deletes all the "value" components and clears the container. Does nothing
// in the case it's given a null pointer.
template <class T>
void STLDeleteValues(T *v) {
if (v != nullptr) {
for (typename T::iterator i = v->begin(); i != v->end(); ++i) {
delete i->second;
}
v->clear();
}
}
template <class T>
std::string ToString(const T& v) {
std::ostringstream os;
os << "[";
for (size_t i = 0; i < v.size(); ++i) {
os << v[i];
if (i < v.size() - 1) {
os << ", ";
}
}
os << "]";
return os.str();
}
} // namespace art
#endif // ART_RUNTIME_BASE_STL_UTIL_H_
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