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From: Francis Glassborow <francis.glassborow@ntlworld.com>
Newsgroups: comp.lang.ada,comp.lang.c++.moderated
Subject: Re: C bug of the day
Date: 15 Jun 2003 14:31:04 -0400
Organization: Southfield Microcomputer SS
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In message <CnRGa.11791$KF1.273607@amstwist00>, Terje Sletteb�
<tslettebo@chello.no.nospam> writes
>I would be interested to know how read() is implemented. Could you
>posted it?

Well for what they are worth here is the complete set of overloaded
function templates

Comments for improving them are very welcome.

// These templates provide safe input for any type that supports
operator>>
// 1) from console with prompt

        template<typename in_type>
        in_type read(std::string const & prompt, int max_tries = 3){
                in_type temp;
                int tries(0);
                while(tries++ != max_tries ){
                        std::cout << prompt;
                        std::cin >> temp;
                        if(std::cin.good()) return temp;
                        std::cin.clear();       // if it has failed,
reset it to normal
                        while(cin.get() != '\n'); flush stream
                        std::cout << "\n That input was incorrect, try
again: \n";
                }
                throw fgw::problem("Too many attempts to read data.");
        }

// 2) version without prompt, defaults to colon space prompt
        template<typename in_type>
        in_type read(int max_tries=3){
                return read<in_type>(": ", max_tries);
        }

// 3) version for general input stream, throws an exception if fails
        template<typename in_type>
                in_type read(std::istream & in){
                        in_type temp;
                        in >> temp;
                        if(in.good()) return temp;
                        if(in.eof()) throw fgw::problem("Tried to read
past end of file"); // handle end of file as special case
                        in.clear();  // reset input stream
                        throw fgw::problem("Corrupted data stream.");
                }


-- 
ACCU Spring Conference 2003 April 2-5
The Conference you should not have missed
ACCU Spring Conference 2004 Late April
Francis Glassborow      ACCU


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