[Bug c++/48255] default constructor with argument INT

[lisp2d at lisp2d dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48255

--- Comment #2 from Lisp2D <lisp2d at lisp2d dot net> 2011-03-23 16:15:14 UTC ---
found silent conversion

class A have

explicit A(std::complex<long double>const& x);