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Programming > C++ Leda > Calling operato...
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Calling operator + multiple times in the same expression.

by BigMan@[EMAIL PROTECTED] (BigMan) Feb 1, 2005 at 03:09 PM

I get this error message

"error C2440: 'argument' : cannot convert from 'Type' to 'Type &'"

compiling the following piece of code with VC++ 7.1 (w/o language
extensions!):


///////////////////////////////////////////////////////////////////////////

class Type
{
public:
	Type ( ) { }
	Type( Type& ) { }
};

///////////////////////////////////////////////////////////////////////////////

inline Type operator +
(
	Type const&
,	Type const&
)
{
	Type Result;
	return Result;
}

///////////////////////////////////////////////////////////////////////////

inline Type operator -
(
	Type const&,
	Type const&
)
{
	Type Result;
	return Result;
}

///////////////////////////////////////////////////////////////////////////////

int main
(
	int,
	char*
)
{
	Type a, b, c;
	a - b;			// 1
	a - b + c;		// 2
	
	return 0;
}

///////////////////////////////////////////////////////////////////////////////

Line 1 compiles fine, but line 2 does not. VC++ 7.1 tries to call the
copy ctor in order to compile line 2 and fails. I cannot see the
reason to do so.

Please tell me if this code sould compile accoring to the standard. If
not, explain why.

      [ See http://www.gotw.ca/resources/clcm.htm
for info about ]
      [ comp.lang.c++.moderated.    First time posters: Do this! ]




 8 Posts in Topic:
Calling operator + multiple times in the same expression.
BigMan@[EMAIL PROTECTED]   2005-02-01 15:09:17 
Re: Calling operator + multiple times in the same expression.
"Abhishek Pamecha&qu  2005-02-01 18:23:20 
Re: Calling operator + multiple times in the same expression.
Victor Bazarov <v.Abaz  2005-02-01 18:28:35 
Re: Calling operator + multiple times in the same expression.
"Thomas Mang" &  2005-02-01 18:27:29 
Re: Calling operator + multiple times in the same expression.
BigMan@[EMAIL PROTECTED]   2005-02-02 15:02:26 
Re: Calling operator + multiple times in the same expression.
"Thomas Tutone"  2005-02-03 05:41:22 
Re: Calling operator + multiple times in the same expression.
kanze@[EMAIL PROTECTED]   2005-02-03 10:19:34 
Re: Calling operator + multiple times in the same expression.
"Thomas Mang" &  2005-02-05 20:44:40 

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tan12V112 Wed May 14 11:06:08 CDT 2008.