| // Copyright 2015 The PDFium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CORE_FXCRT_STL_UTIL_H_ |
| #define CORE_FXCRT_STL_UTIL_H_ |
| |
| #include <memory> |
| |
| #include "third_party/base/numerics/safe_conversions.h" |
| |
| namespace fxcrt { |
| |
| // Means of generating a key for searching STL collections of std::unique_ptr |
| // that avoids the side effect of deleting the pointer. |
| template <class T> |
| class FakeUniquePtr : public std::unique_ptr<T> { |
| public: |
| using std::unique_ptr<T>::unique_ptr; |
| ~FakeUniquePtr() { std::unique_ptr<T>::release(); } |
| }; |
| |
| // Type-deducing wrapper for FakeUniquePtr<T>. |
| template <class T> |
| FakeUniquePtr<T> MakeFakeUniquePtr(T* arg) { |
| return FakeUniquePtr<T>(arg); |
| } |
| |
| // Convenience routine for "int-fected" code, so that the stl collection |
| // size_t size() method return values will be checked. |
| template <typename ResultType, typename Collection> |
| ResultType CollectionSize(const Collection& collection) { |
| return pdfium::base::checked_cast<ResultType>(collection.size()); |
| } |
| |
| // Convenience routine for "int-fected" code, to handle signed indicies. The |
| // compiler can deduce the type, making this more convenient than the above. |
| template <typename IndexType, typename Collection> |
| bool IndexInBounds(const Collection& collection, IndexType index) { |
| return index >= 0 && index < CollectionSize<IndexType>(collection); |
| } |
| |
| } // namespace fxcrt |
| |
| #endif // CORE_FXCRT_STL_UTIL_H_ |