dev-cpp-users

RE: [Dev-C++] Operator overloading for built in types.

[Damien A <g_...@ho...>]

<html><div style='background-color:'><DIV class=RTE>
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<P>You could change your code to use C++ strings instead of char*.&nbsp; That way, you 
<DIV>wouldn't have to write your own == function, as it is one of the methods of the C++ string class.&nbsp; </DIV>
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<DIV>#include &lt;iostream&gt;<BR>#include &lt;string&gt;<BR>using namespace std;<BR>int main()<BR>{ <BR>&nbsp; string x = "Hello";<BR>&nbsp; string y = "Hello";<BR>&nbsp; if(x == y)<BR>&nbsp;&nbsp;&nbsp; cout &lt;&lt; "Equal" &lt;&lt; endl;<BR>&nbsp; else<BR>&nbsp;&nbsp;&nbsp; cout &lt;&lt; "Not equal" &lt;&lt; endl;<BR>&nbsp; cin.get();<BR>&nbsp; return 0;<BR>}</DIV>
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<DIV></DIV>&gt;From: David McKen <CI...@YA...>
<DIV></DIV>&gt;Reply-To: ci...@ya... 
<DIV></DIV>&gt;To: Dev-C Mailing List <DEV...@LI...>
<DIV></DIV>&gt;Subject: [Dev-C++] Operator overloading for built in types. 
<DIV></DIV>&gt;Date: Sat, 27 Dec 2003 06:37:31 -0800 (PST) 
<DIV></DIV><mailto:dev...@li...?subject=unsubscribe><mailto:dev...@li...><mailto:dev...@li...?subject=help><mailto:dev...@li...?subject=subscribe>
<DIV></DIV>&gt; 
<DIV></DIV>&gt;Ok here is my dilema. 
<DIV></DIV>&gt; 
<DIV></DIV>&gt;Scattered throught my code is the following line: 
<DIV></DIV>&gt; 
<DIV></DIV>&gt;if(!strcmp(var1,var2)) 
<DIV></DIV>&gt;.... 
<DIV></DIV>&gt; 
<DIV></DIV>&gt;What would be the best way to change that to 
<DIV></DIV>&gt; 
<DIV></DIV>&gt;if( var1 == var2 ) 
<DIV></DIV>&gt;.... 
<DIV></DIV>
<P>
<DIV>&nbsp;</DIV></P></mailto:dev...@li...?subject=subscribe></mailto:dev...@li...?subject=help></mailto:dev...@li...></mailto:dev...@li...?subject=unsubscribe></div><br clear=all><hr>Add photos to your messages with  <a href="http://g.msn.com/8HMAEN/2749??PS=">MSN 8. </a> Get 2 months FREE*.</html>

Re: [Dev-C++] Operator overloading for built in types.

[Hossein H. <ult...@em...>]

Dear David,

Sorry for this much late reply! I was too busy to answer any email, but had kept your message so that I could answer it ASAP. The reason I did this at all was that I found the topic attractive.

The point is that your code is, according to the Standard, ILLEGAL! I'm saying this as per the item 3 in Chapter 5 of the Standard (page 63 of the copy I've got). The second statement at this paragraph says: "Operator overloading shall not modify the rules for the Built-in operators, that is, for operators applied to types for which they are defined by this standard."

I hope it now to be clear enough what you'r trying to do is illegal, as you'r changing the semantics of the operator == for the char* type, which is defined by the ISO/IEC 14882.

All of the Best,
--Hossein

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