tesseract/ccutil/hashfn.h

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/**********************************************************************
* File: hashfn.h (Formerly hash.h)
* Description: Portability hacks for hash_map, hash_set and unique_ptr.
* Author: Ray Smith
* Created: Wed Jan 08 14:08:25 PST 2014
*
* (C) Copyright 2014, Google Inc.
** 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 HASHFN_H
#define HASHFN_H
#if (__cplusplus >= 201103L) || defined(_MSC_VER) // Visual Studio
#include <unordered_map>
#include <unordered_set>
#if defined(_MSC_VER) && (_MSC_VER >= 1500 && _MSC_VER < 1600) // VS 2008
#define TessHashMap std::tr1::unordered_map
#define TessHashSet std::tr1::unordered_set
#else // _MSC_VER
#define TessHashMap std::unordered_map
#define TessHashSet std::unordered_set
#include <memory>
#define SmartPtr std::unique_ptr
#define HAVE_UNIQUE_PTR
#endif // _MSC_VER
#elif (defined(__GNUC__) && (((__GNUC__ == 3) && (__GNUC_MINOR__ > 0)) || \
__GNUC__ >= 4)) // gcc
// hash_set is deprecated in gcc
#include <ext/hash_map>
#include <ext/hash_set>
using __gnu_cxx::hash_map;
using __gnu_cxx::hash_set;
#define TessHashMap __gnu_cxx::hash_map
#define TessHashSet __gnu_cxx::hash_set
#else
#include <hash_map>
#include <hash_set>
#define TessHashMap hash_map
#define TessHashSet :hash_set
#endif // gcc
#ifndef HAVE_UNIQUE_PTR
// Trivial smart ptr. Expand to add features of std::unique_ptr as required.
template<class T> class SmartPtr {
public:
SmartPtr() : ptr_(NULL) {}
explicit SmartPtr(T* ptr) : ptr_(ptr) {}
~SmartPtr() {
delete ptr_;
}
T* get() const {
return ptr_;
}
void reset(T* ptr) {
if (ptr_ != NULL) delete ptr_;
ptr_ = ptr;
}
bool operator==(const T* ptr) const {
return ptr_ == ptr;
}
T* operator->() const {
return ptr_;
}
private:
T* ptr_;
};
#endif // HAVE_UNIQUE_PTR
#endif // HASHFN_H