Discriminated pointer.
Declared in <folly/DiscriminatedPtr.h>
template<typename... Types>
class DiscriminatedPtr;Given a list of types, a DiscriminatedPtr<Types...> may point to an object of one of the given types, or may be empty. DiscriminatedPtr is type-safe: you may only get a pointer to the type that you put in, otherwise get throws an exception (and get_nothrow returns nullptr)
This pointer does not do any kind of lifetime management -- it's not a "smart" pointer. You are responsible for deallocating any memory used to hold pointees, if necessary.
| Name | Description |
|---|---|
DiscriminatedPtr [constructor] | Constructors |
operator= | Assignment operator from a pointer of type T. |
apply | apply overloads |
clear | Clear this DiscriminatedPtr, making it empty. |
empty | Return true iff this DiscriminatedPtr is empty. |
get | get overloads |
get_nothrow | get_nothrow overloads |
hasType | Return true iff the object pointed by this DiscriminatedPtr has type T, false otherwise. Fails at compile time if T is not a valid type (listed in Types...) |
index | Get the 1-based type index of the type currently stored in this pointer. Returns 0 if the pointer is empty. |
set | Set this DiscriminatedPtr to point to an object of type T. Fails at compile time if T is not a valid type (listed in Types) |