The equivalent of std::decay happens to argument types for functions. (It's actually the reverse, std::decay is modeled after what functions arguments do.)
The outermost const will be dropped from the signature. By outermost, think of types as envelopes composed over different types. A pointer to const int is a different type than a pointer to int, and will result in a different function signature. (With a pointer, you can think of the pointer itself as the outer thing, and what it points to is "inner" and not modified.)
const int - becomes just intint * is unchanged and remains int *const int * is unchanged and remains const int * - const is on the int, not the pointer, and only the outermost const is droppedint const * is unchanged and remains int const * - const is on the int, not the pointer, and only the outermost const is dropped. (Note, this is 100% identical in meaning as const int *)
int * const - changes to int * - because const qualifies the outermost pointer
int * const * const becomes int * const * - outer const is dropped on outer pointer, inner const is not dropped on the inner pointer.const int * const * const becomes const int * const * - outer const is dropped on outer pointer, inner const is not dropped on the inner pointer, and const is also kept on the internal-most intMyTemplate - unchanged, remains MyTemplate, because the const isn't on the outer type, but nestled in a template parameter
So yes, const does affect type, but not in the simple case like you tried. Only when it's contained inside of a type, not affecting the outermost type.
If you read types from right-to-left it can help. If the rightmost thing in a type specifier is a const, it is always dropped (example int * const). If the leftmost thing is const, it is only dropped if the thing it is qualifying is the rightmost thing in the type (example const int, the leftmost thing is const and it affects the int to its right AND the int to its right is the rightmost thing in the type.) (example 2: const * int not dropped, because leftmost const modifies the thing to its right that is not the rightmost thing in the type.)
