http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53586
--- Comment #2 from Paulo Torrens <paulotorrens at gnu dot org> 2012-06-06
18:43:13 UTC ---
(In reply to comment #1)
> What happens if you use decltype instead of typeof ?
template<typename T> auto ptr2bitmap(T *bitmap, int width, int depth = 3) ->
decltype(decltype(unsigned char[depth])[width]) *{
return bitmap;
};
int main() {
void *x;
auto a = ptr2bitmap(x, 100);
};
test.cpp:2:10: error: expected primary-expression before 'decltype'
test.cpp:2:10: error: expected ')' before 'decltype'
test.cpp:2:1: error: expected type-specifier before 'decltype'
test.cpp:2:1: error: expected initializer before 'decltype'
And without decltype and typeof at all:
template<typename T> auto ptr2bitmap(T *bitmap, int width, int depth = 3) ->
unsigned char[depth][width] *{
return bitmap;
};
int main() {
void *x;
auto a = ptr2bitmap(x, 100);
};
test.cpp:2:15: error: use of parameter 'depth' outside function body
test.cpp:2:22: error: use of parameter 'width' outside function body
test.cpp:2:29: error: expected initializer before '*' token
