a simple patch about boost::format (for MSVC7.1)

[whitecrw]

It seems to be a bug on MSVC7.1 compiler.

that foolish compiler has some conflict on matching 
signature...

'basic_format<Ch,Tr,Alloc>::size_type 
boost::basic_format<Ch,Tr,Alloc>::size(void) const'
and
'boost::basic_format<Ch,Tr,Alloc>::size_type 
boost::basic_format<Ch,Tr,Alloc>::size(void) const'

i think this is ultimately same signature. but, msvc71 
doesn't..

for this, i used some #if tricks. :)

attached patchfile contains my modifications.

may the code be with you~

[biochimia]

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A different fix for the same bug was committed on 27-Feb-2005.

Closing as fixed.

[biochimia]

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Actually that should be 25-Feb-2005 (rev. 1.25 of file
boost/format/format_implementation.hpp).