Alias template proxy_view
Class template observer_facade
template <facade F>
struct observer_facade; // since 3.2.0
template <facade F>
using proxy_view = proxy<observer_facade<F>>; // since 3.2.0
Class template observer_facade is a facade type for observer pointers (e.g., raw pointers) potentially dereferenced from a proxy object.
Member Types of observer_facade
| Name |
Description |
convention_types |
A tuple-like type transformed from typename F::convention_types. Specifically, for each convention type C defined in typename F::convention_types, C is reserved when C::is_direct is false or when C is an upward conversion convention added via basic_facade_builder::add_facade<?, true>, or otherwise filtered out. |
reflection_types |
A tuple-like type transformed from typename F::reflection_types. Specifically, for each reflection type R in typename F::reflection_types, R is reserved when R::is_direct is false, or otherwise filtered out. |
Member Constants of observer_facade
| Name |
Description |
constraints [static] [constexpr] |
A value of type proxiable_ptr_constraints indicating constraints for an observer pointer type. |
Example
#include <map>
#include "proxy.h"
template <class K, class V>
struct FMap : pro::facade_builder
::add_convention<pro::operator_dispatch<"[]">, V&(const K& key)>
::build {};
int main() {
std::map<int, int> v;
pro::proxy_view<FMap<int, int>> p = &v;
(*p)[1] = 123;
printf("%d\n", v.at(1)); // Prints "123"
}
See Also