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110 lines
3.1 KiB
C++
110 lines
3.1 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2002 The ScummVM project
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*/
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#ifndef COMMON_STRING_H
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#define COMMON_STRING_H
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#include "scummsys.h"
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#include "common/list.h"
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namespace ScummVM {
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/*
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TODO
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Add a class ConstString which is a light weight base class of String.
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It will be immutable, and *not* copy the char pointer it gets when created.
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Only constructor: ConstString(const char *ptr)
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Then whenever you now use "const String &" in a parameter, use "const ConstString &"
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instead (mayhaps make a typedef even). Thus, parameters are passed w/o
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causing a free/malloc. Then only for permenant storage, when we assign it to a
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real String object, will a malloc be issued (to this end, make String aware of
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ConstString ?!?
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*/
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class ConstString {
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friend class String;
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protected:
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char *_str;
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int _len;
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public:
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ConstString() : _str(0), _len(0) {}
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ConstString(const char *str) : _str((char*)str) { _len = str ? strlen(str) : 0; }
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virtual ~ConstString() {}
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bool operator ==(const ConstString& x) const;
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bool operator ==(const char* x) const;
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bool operator !=(const ConstString& x) const;
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bool operator !=(const char* x) const;
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bool operator <(const ConstString& x) const;
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bool operator <=(const ConstString& x) const;
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bool operator >(const ConstString& x) const;
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bool operator >=(const ConstString& x) const;
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const char *c_str() const { return _str; }
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int size() const { return _len; }
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bool isEmpty() const { return (_len == 0); }
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};
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class String : public ConstString {
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protected:
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int *_refCount;
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int _capacity;
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public:
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String() : _capacity(0) { _refCount = new int(1); }
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String(const char *str);
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String(const ConstString &str);
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String(const String &str);
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virtual ~String();
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String& operator =(const char* str);
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String& operator =(const String& str);
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String& operator +=(const char* str);
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String& operator +=(const String& str);
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String& operator +=(char c);
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void deleteLastChar();
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void clear();
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protected:
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void ensureCapacity(int new_len, bool keep_old);
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void decRefCount();
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};
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// Some useful additional comparision operators for Strings
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bool operator == (const char* x, const ConstString& y);
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bool operator != (const char* x, const ConstString& y);
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class StringList : public List<String> {
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public:
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void push_back(const char* str)
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{
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ensureCapacity(_size + 1);
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_data[_size] = str;
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_size++;
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}
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};
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}; // End of namespace ScummVM
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#endif
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