1 /* $Id: join.h 616 2005-08-19 20:11:01Z bruce $ */
2 // Copyright (C) 2018 Bruce Guenter <bruce@untroubled.org>
3 //
4 // This program is free software; you can redistribute it and/or modify
5 // it under the terms of the GNU General Public License as published by
6 // the Free Software Foundation; either version 2 of the License, or
7 // (at your option) any later version.
8 //
9 // This program is distributed in the hope that it will be useful,
10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 // GNU General Public License for more details.
13 //
14 // You should have received a copy of the GNU General Public License
15 // along with this program; if not, write to the Free Software
16 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17
18 #ifndef MYSTRING__JOIN__H__
19 #define MYSTRING__JOIN__H__
20
21 class mystringjoin
22 {
23 private:
24 const mystringjoin* prev;
25 mystringrep* rep;
26 const char* str;
27
28 mystringjoin();
29 public:
mystringjoin(const mystringjoin & j)30 mystringjoin(const mystringjoin& j)
31 : prev(j.prev), rep(j.rep), str(j.str)
32 {
33 rep->attach();
34 }
mystringjoin(const mystring & s)35 mystringjoin(const mystring& s)
36 : prev(0), rep(s.rep), str(s.rep->buf)
37 {
38 rep->attach();
39 }
mystringjoin(const char * s)40 mystringjoin(const char* s)
41 : prev(0), rep(0), str(s)
42 {
43 }
mystringjoin(const mystringjoin & p,const mystring & s)44 mystringjoin(const mystringjoin& p, const mystring& s)
45 : prev(&p), rep(s.rep), str(s.rep->buf)
46 {
47 rep->attach();
48 }
mystringjoin(const mystringjoin & p,const char * s)49 mystringjoin(const mystringjoin& p, const char* s)
50 : prev(&p), rep(0), str(s)
51 {
52 }
~mystringjoin()53 ~mystringjoin()
54 {
55 if(rep) rep->detach();
56 }
57 mystringrep* traverse() const;
58 };
59
mystring(const mystringjoin & j)60 inline mystring::mystring(const mystringjoin& j)
61 : rep(j.traverse())
62 {
63 rep->attach();
64 }
65
66 inline mystringjoin operator+(const mystringjoin& a, const mystring& b)
67 {
68 return mystringjoin(a, b);
69 }
70
71 inline mystringjoin operator+(const mystringjoin& a, const char* b)
72 {
73 return mystringjoin(a, b);
74 }
75
76 #endif
77