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Location: cpp/openttd-patchpack/source/src/core/smallvec_type.hpp
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | /* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file smallvec_type.hpp Simple vector class that allows allocating an item without the need to copy this->data needlessly. */
#ifndef SMALLVEC_TYPE_HPP
#define SMALLVEC_TYPE_HPP
#include "alloc_func.hpp"
#include "mem_func.hpp"
#include <vector>
#include <algorithm>
/**
* Helper function to append an item to a vector if it is not already contained
* Consider using std::set, std::unordered_set or std::flat_set in new code
*
* @param vec A reference to the vector to be extended
* @param item Reference to the item to be copy-constructed if not found
*
* @return Whether the item was already present
*/
template <typename T>
inline bool include(std::vector<T>& vec, const T &item)
{
const bool is_member = std::find(vec.begin(), vec.end(), item) != vec.end();
if (!is_member) vec.emplace_back(item);
return is_member;
}
/**
* Helper function to get the index of an item
* Consider using std::set, std::unordered_set or std::flat_set in new code
*
* @param vec A reference to the vector to be extended
* @param item Reference to the item to be search for
*
* @return Index of element if found, otherwise -1
*/
template <typename T>
int find_index(std::vector<T> const& vec, T const& item)
{
auto const it = std::find(vec.begin(), vec.end(), item);
if (it != vec.end()) return it - vec.begin();
return -1;
}
/**
* Helper function to append N default-constructed elements and get a pointer to the first new element
* Consider using std::back_inserter in new code
*
* @param vec A reference to the vector to be extended
* @param num Number of elements to be default-constructed
*
* @return Pointer to the first new element
*/
template <typename T>
T* grow(std::vector<T>& vec, std::size_t num)
{
std::size_t const pos = vec.size();
vec.resize(pos + num);
return vec.data() + pos;
}
/**
* Simple vector template class, with automatic free.
*
* @note There are no asserts in the class so you have
* to care about that you grab an item which is
* inside the list.
*
* @param T The type of the items stored, must be a pointer
*/
template <typename T>
class AutoFreeSmallVector : public std::vector<T> {
public:
~AutoFreeSmallVector()
{
this->Clear();
}
/**
* Remove all items from the list.
*/
inline void Clear()
{
for (T p : *this) {
free(p);
}
std::vector<T>::clear();
}
};
/**
* Simple vector template class, with automatic delete.
*
* @note There are no asserts in the class so you have
* to care about that you grab an item which is
* inside the list.
*
* @param T The type of the items stored, must be a pointer
*/
template <typename T>
class AutoDeleteSmallVector : public std::vector<T> {
public:
~AutoDeleteSmallVector()
{
this->Clear();
}
/**
* Remove all items from the list.
*/
inline void Clear()
{
for (T p : *this) {
delete p;
}
std::vector<T>::clear();
}
};
typedef AutoFreeSmallVector<char*> StringList; ///< Type for a list of strings.
#endif /* SMALLVEC_TYPE_HPP */
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