Geoff Chappell - Software Analyst
empty character constant
As the message text states plainly enough, the empty character constant is illegal. Thus,
char ch = '';
int x = '';
both produce error C2137.
A curiosity, however, is that an empty wide-character constant causes the compiler no problem. In
wchar_t ch = L'';
(if the wchar_t type is defined, as by the /Zc:wchar_t option) and
int x = L'';
the constant evaluates to zero and there is no error.