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112 lines
2.9 KiB
C++
112 lines
2.9 KiB
C++
/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file tinystring_type.hpp Functions related to the allocation of memory */
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#ifndef TINYSTRING_TYPE_HPP
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#define TINYSTRING_TYPE_HPP
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#include "../string_func.h"
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#include <cstddef>
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#include <cstring>
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#include <string>
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/**
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* An SLE_STR compatible tiny c-string wrapper class.
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*
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* This is intended for the cases where the string is almost always empty,
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* and the space overhead of std::string is undesirable.
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*/
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class TinyString {
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char *storage = nullptr;
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public:
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inline TinyString()
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{
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static_assert(offsetof(TinyString, storage) == 0, "offsetof(TinyString, storage) must be 0");
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}
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inline TinyString(const TinyString &other)
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{
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if (other.storage != nullptr) this->storage = stredup(other.storage);
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}
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inline TinyString(TinyString &&other) noexcept
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{
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this->storage = other.storage;
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other.storage = nullptr;
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}
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inline TinyString(const std::string &other) noexcept
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{
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if (!other.empty()) this->storage = stredup(other.c_str());
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}
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inline TinyString(const char *str) noexcept
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{
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if (str != nullptr && *str != 0) this->storage = stredup(str);
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}
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inline void clear()
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{
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if (this->storage != nullptr) {
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free(this->storage);
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this->storage = nullptr;
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}
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}
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inline ~TinyString()
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{
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if (this->storage != nullptr) free(this->storage);
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}
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inline TinyString &operator=(const TinyString &other)
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{
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this->clear();
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if (other.storage != nullptr) this->storage = stredup(other.storage);
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return *this;
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}
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inline TinyString &operator=(TinyString &&other) noexcept
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{
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this->clear();
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if (other.storage != nullptr) {
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this->storage = other.storage;
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other.storage = nullptr;
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}
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return *this;
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}
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inline TinyString &operator=(const std::string &other)
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{
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this->clear();
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if (!other.empty()) this->storage = stredup(other.c_str());
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return *this;
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}
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inline TinyString &operator=(const char *str)
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{
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this->clear();
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if (str != nullptr && *str != 0) this->storage = stredup(str);
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return *this;
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}
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inline bool operator==(const char *str) const
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{
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if (str == nullptr) return this->empty();
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if (this->storage == nullptr) return *str == 0;
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return strcmp(this->storage, str) == 0;
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}
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inline bool empty() const { return this->storage == nullptr || *this->storage == 0; }
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inline const char *c_str() const { return this->storage; }
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inline const char *data() const { return this->storage; }
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};
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#endif /* TINYSTRING_TYPE_HPP */
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