c++/9666: Arg conversion problem with operator new

[BrainChild at Skyler dot com]

>Number:         9666
>Category:       c++
>Synopsis:       Arg conversion problem with operator new
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Feb 11 20:46:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Don Stauffer
>Release:        3.2
>Organization:
>Environment:
Cygwin under Windows 2000 Professional
>Description:
g++ produces error "size in array new must have integral type" if you use new[] with an argument of a class with two integral conversion operators which are identical exception one is a const method.  The conversion works if used to pass the class object as a size_t function argument, and works with new if you remove either one of the conversion operators.
>How-To-Repeat:
#include	<cstddef>

struct	X
{
	operator size_t	()				{	return
2;	}
	operator size_t	()	const	{	return	3;	}
};

char	*f1	(	size_t	n	)		{	return
new	char[n];	}

char	*f2	(	const X	&x	)	{	return	new
char[x];	}

int	main	(void)					{	}

/*

$ g t.cpp -ot
t.cpp: In function `char* f2(const X&)':
t.cpp:11: size in array new must have integral type

*/
>Fix:
Workaround: Call a function which converts the argument and allocates the memory rather than calling new directly.
>Release-Note:
>Audit-Trail:
>Unformatted: