Use a template parameter in a preprocessor directive?
Posted
by Ranju V
on Stack Overflow
See other posts from Stack Overflow
or by Ranju V
Published on 2010-05-25T12:08:23Z
Indexed on
2010/05/25
12:11 UTC
Read the original article
Hit count: 284
Is it possible to use a non-type constant template parameter in a preprocessor directive? Here's what I have in mind:
template <int DING>
struct Foo
{
enum { DOO = DING };
};
template <typename T>
struct Blah
{
void DoIt()
{
#if (T::Doo & 0x010)
// somecode here
#endif
}
};
When I try this with something like Blah<Foo<0xFFFF>>, VC++ 2010 complains something about unmatched parentheses in the line where we are trying to use "#if". I am guessing the preprocessor doesn't really know anything about templates and this sort of thing just isn't in its domain. What say? Thanks!
© Stack Overflow or respective owner
