Symbol.h
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/*ident "@(#)Symbol:incl/Symbol.h 3.1" */
/******************************************************************************
*
* C++ Standard Components, Release 3.0.
*
* Copyright (c) 1991, 1992 AT&T and Unix System Laboratories, Inc.
* Copyright (c) 1988, 1989, 1990 AT&T. All Rights Reserved.
*
* THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T and Unix System
* Laboratories, Inc. The copyright notice above does not evidence
* any actual or intended publication of such source code.
*
******************************************************************************/
#ifndef SYMBOL_H__
#define SYMBOL_H__
#include <String.h>
#include <Set.h>
class Symbol {
public:
inline Symbol();
Symbol(const String& s);
Symbol(const char* p);
Symbol(const Symbol& s) : sp(s.sp) {}
inline Symbol& operator=(const Symbol& b);
int operator==(const Symbol& b) const { return sp == b.sp; }
int operator!=(const Symbol& b) const { return sp != b.sp; }
int operator<(const Symbol& b) const { return sp < b.sp; }
int operator<=(const Symbol& b) const { return sp <= b.sp; }
int operator>(const Symbol& b) const { return sp > b.sp; }
int operator>=(const Symbol& b) const { return sp >= b.sp; }
String the_string() const { return *sp; }
unsigned long hashval() const { return (unsigned long)sp; }
static void cleanup() { // for purify users: call this at end of
// application program to clean up potential memory
// leak messages from purify
if (table_ptr!=0) delete table_ptr; table_ptr=0; nil_=0; }
private:
static void initialize() { if (nil_ == 0) doinitialize(); }
static void doinitialize();
static Set<String>* table_ptr;
static const String* nil_;
static const String* nil() { initialize(); return nil_; }
const String* sp;
};
class istream;
class ostream;
istream& operator>>(istream& is, Symbol& s);
ostream& operator<<(ostream& os, const Symbol& s);
Symbol::Symbol() {
sp = nil();
}
Symbol& Symbol::operator=(const Symbol& b) {
sp = b.sp;
return *this;
}
#ifdef __edg_att_40
#pragma can_instantiate Set<String>
#endif
#endif