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// Ceres Solver - A fast non-linear least squares minimizer
// Copyright 2010, 2011, 2012 Google Inc. All rights reserved.
// http://code.google.com/p/ceres-solver/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of Google Inc. nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Author: keir@google.com (Keir Mierle)
//
// Originally by Anton Carver
#ifndef CERES_INTERNAL_MAP_UTIL_H_
#define CERES_INTERNAL_MAP_UTIL_H_
#include <utility>
#include "ceres/internal/port.h"
namespace ceres {
// Perform a lookup in a map or hash_map, assuming that the key exists.
// Crash if it does not.
//
// This is intended as a replacement for operator[] as an rvalue (for reading)
// when the key is guaranteed to exist.
//
// operator[] is discouraged for several reasons:
// * It has a side-effect of inserting missing keys
// * It is not thread-safe (even when it is not inserting, it can still
// choose to resize the underlying storage)
// * It invalidates iterators (when it chooses to resize)
// * It default constructs a value object even if it doesn't need to
//
// This version assumes the key is printable, and includes it in the fatal log
// message.
template <class Collection>
const typename Collection::value_type::second_type&
FindOrDie(const Collection& collection,
const typename Collection::value_type::first_type& key) {
typename Collection::const_iterator it = collection.find(key);
CHECK(it != collection.end()) << "Map key not found: " << key;
return it->second;
}
// Perform a lookup in a map or hash_map.
// If the key is present in the map then the value associated with that
// key is returned, otherwise the value passed as a default is returned.
template <class Collection>
const typename Collection::value_type::second_type&
FindWithDefault(const Collection& collection,
const typename Collection::value_type::first_type& key,
const typename Collection::value_type::second_type& value) {
typename Collection::const_iterator it = collection.find(key);
if (it == collection.end()) {
return value;
}
return it->second;
}
// Insert a new key and value into a map or hash_map.
// If the key is not present in the map the key and value are
// inserted, otherwise nothing happens. True indicates that an insert
// took place, false indicates the key was already present.
template <class Collection>
bool InsertIfNotPresent(
Collection * const collection,
const typename Collection::value_type::first_type& key,
const typename Collection::value_type::second_type& value) {
pair<typename Collection::iterator, bool> ret =
collection->insert(typename Collection::value_type(key, value));
return ret.second;
}
// Perform a lookup in a map or hash_map.
// Same as above but the returned pointer is not const and can be used to change
// the stored value.
template <class Collection>
typename Collection::value_type::second_type*
FindOrNull(Collection& collection, // NOLINT
const typename Collection::value_type::first_type& key) {
typename Collection::iterator it = collection.find(key);
if (it == collection.end()) {
return 0;
}
return &it->second;
}
// Test to see if a set, map, hash_set or hash_map contains a particular key.
// Returns true if the key is in the collection.
template <class Collection, class Key>
bool ContainsKey(const Collection& collection, const Key& key) {
typename Collection::const_iterator it = collection.find(key);
return it != collection.end();
}
// Inserts a new key/value into a map or hash_map.
// Dies if the key is already present.
template<class Collection>
void InsertOrDie(Collection* const collection,
const typename Collection::value_type::first_type& key,
const typename Collection::value_type::second_type& data) {
typedef typename Collection::value_type value_type;
CHECK(collection->insert(value_type(key, data)).second)
<< "duplicate key: " << key;
}
} // namespace ceres
#endif // CERES_INTERNAL_MAP_UTIL_H_
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