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From: jima@hplsla.HP.COM (Jim Adcock)
Newsgroups: comp.lang.c++
Subject: Re: Class initialization
Message-ID: <6590254@hplsla.HP.COM>
Date: 18 Sep 89 18:15:08 GMT
References: <DOUGM.89Sep17031020@rhea.rice.edu>
Organization: HP Lake Stevens, WA
Lines: 72

// re first question:

// Unfortunately, your reasonable request still does not seem to be supported
// by C++ compilers.  You should be able to meet your needs by declaring
// a constant static class member, and defining an initial value for it.  
// But present compilers will not allow you to give it an initial value until
// after the class declaration, and will not accept a class declaration with
// an array size whose bounds are not known at class declaration time.

#include <stdio.h>

typedef char* cstring;

// What today's C++ compilers should be willing to accept, but won't:
//
// class cstringstack;
//
// static const int cstringstack::maxStackSize = 100; ?!?!?!?
//
// class cstringstack
// {
//   static const int maxStackSize; ?!?!?!?
//   cstring element[maxStackSize];
//   int top;
// public:
//   cstringstack(): top(0) {}
//   void push(const cstring s){element[top++] = s;}
//   cstring pop(){return element[--top];}
//   cstringstack& popprint(){printf("%s\n",this->pop()); return *this;}
// };

// Or maybe they should accept:
//
// class cstringstack
// {
//   static const int maxStackSize;
//   cstring element[maxStackSize]; ?!?!?!?
//   int top;
// public:
//   cstringstack(): top(0) {}
//   void push(const cstring s){element[top++] = s;}
//   cstring pop(){return element[--top];}
//   cstringstack& popprint(){printf("%s\n",this->pop()); return *this;}
// };
//
// static const int cstringstack::maxStackSize = 100; ?!?!?!?

// the best you can do with today's compilers:

 static const int cstringstack__maxStackSize = 100;

 class cstringstack
 {
   cstring element[cstringstack__maxStackSize];
   int top;
 public:
   cstringstack(): top(0) {}
   void push(const cstring s){element[top++] = s;}
   cstring pop(){return element[--top];}
   cstringstack& popprint(){printf("%s\n",this->pop()); return *this;}
 };

void main()
{
  cstringstack stk;

  stk.push("hi mom");
  stk.push("hello dad");
  stk.push("bye world");

  stk.popprint().popprint().popprint();
}