From:	cdkrug AT aol DOT com (CDKrug)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Mysterious C++ STL compiler message
Date:	9 Nov 1997 18:26:26 GMT
Lines:	44
Message-ID:	<19971109182601.NAA28166@ladder01.news.aol.com>
NNTP-Posting-Host:	ladder01.news.aol.com
Organization:	AOL http://www.aol.com
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

As part of my ongoing effort to gain competence in C++, I've been attempting
to rewrite my circa 1982 equation parsar from Fortran IV to C++.  The class
below returns the following error message on compilation:

/djgpp/lang/cxx/stack.h.29:: operators is not an agregate type

What the heck does it mean by that?  Am I overlooking something obvious, is
there an error in gcc or what?


// This is the infix to post fix converter

#include <stack>
#include <_string.h>

enum operators { leftparen, plus, minus, times, divide};

String opString(operators theOp)
{
    switch (theOp) {
        case plus:         return " + ";
        case minus:        return " - ";
        case times:        return " * ";
        case divide:       return " / ";
        case leftparen:    return " [ ";
        default:           return "\0";
    }
}

void processOp
    (operators theOp, stack<operators> & opStack, String & result)
{
    // pop stack while operators have higher precedence
    while ((! opStack.empty()) && (theOp < opStack.top()))
    {
        result += opString(opStack.top());
        opString.pop();
    }
    opStack.push(theOp);
}


Charles Krug

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