From: "Traveler" <traveler AT netti DOT fi>
Newsgroups: comp.lang.c++,comp.os.msdos.djgpp
Subject: More out from "cout"....
Date: Mon, 8 Oct 2001 04:10:50 +0300
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hi!

Have you ever be annoyed to write code like this every time you just want to list elements of some array ?


"int    someArray[] = {4,54,12,9,234,89,5};

unsigned long    length = sizeof(table)/sizeof(table[0]);

for(unsigned long index = 0;index < length;index++)
    cout << someArray[index] << endl;"

Wouldn´t it be nice to have it like this ?

"int    someArray[] = {4,54,12,9,234,89,5};
cout << someArray << endl;"

Well, no fear when the Traveler is here ! ;)
I have just the thing you are looking for. I have overloaded the "<<" operator for few table types and  I trust that you can do the trick for rest of the ones you want.

Heres the code:

template <int n>
ostream&    operator<<(ostream& output,int (&table)[n])
{
    unsigned long    length = sizeof(table)/sizeof(table[0]);
    for(unsigned long index = 0;index < length;index++)
       output << '[' << table[index] << ']';
    return    output;
}

template <int n>
ostream&    operator<<(ostream& output,double (&table)[n])
{
    unsigned long    length = sizeof(table)/sizeof(table[0]);
    for(unsigned long index = 0;index < length;index++)
        output << '[' << table[index] << ']';
    return    output;
}

// A little more trickier...table of pointer´s to char....
template <int n>
ostream&    operator<<(ostream& output,char* (&table)[n])
{
    unsigned long    length = sizeof(table)/sizeof(table[0]);
    for(unsigned long index = 0;index < length;index++)
        output << '[' << table[index] << ']'; // Maybe not the best possible format for this                                                                                                                 // one...make your own in case your not happy...
    return    output;
}


Testing....

int    intTable[] = {45,345,22,546};
double    doubleTable[] = {4.45,2.34,6.56};
char*        pointerToString[] = {"Boy","Cat","Dog"};
char        string[] = {"Hello"}

cout << intTable << endl;                //  [45][345][22][546]
cout << doubleTable << endl;        //   [4.45][2.34][6.56]
cout << pointerToString << endl;  //   [Boy][Cat][Dog]
cout << string << endl;                    // Hello.    The default way the "cout" handless this is just fine....

See you!

traveler AT netti DOT fi
"No matter how many times you have failed at the end you will succeed..."

PS: Does the code work in Borland compilers and others ? Anybody with access to them please tell me...

PS2: The following question is for Finish computer teacher. Becourse Im a lazy person I but the question and this code in the same message. Sorry :)

Heippa Kauko! Ajattelin vain kysäistä että pidätkö vielä niitä C++ kursseja ? Olisi kiva jos ilmoittaisit heti kun mahdollinen C++ jatkokurssi pidetään. Oletko muuten kirjoittanut kirjan "Algoritmit - C++" ?
T: Stefan Fröberg