Parse error on functor wrapped with paranthesis

[Wei Qin <wqin@xxxxxxxxxxxxxxxx>]

Hi,
	I met a problem compiling the code below

#include <algorithm>

...
bool x = (std::less<int>()(10,20));


	On this line, g++ 3.2 generates an error message of
'parse error before numeric constant'. Without paranthesis, it is fine.
Is this a bug?

thanks for reading,

Wei