[ref_ptr]: _ref_ptr_from_shared_ptr_unsafe

Author: iboB

include/itlib/ref_ptr.hpp

@@ -72,6 +72,7 @@
 //
 // Future Ideas:
 // * void support
+// * static/const/dynamic casts
 // * strong_ref_ptr - a non-nullable ref_ptr variant
 //
 //
@@ -161,6 +162,9 @@ class ref_ptr : private std::shared_ptr<T> {
     std::shared_ptr<T> _as_shared_ptr_unsafe() && noexcept {
         return std::move(*this);
     }
+    static ref_ptr<T> _from_shared_ptr_unsafe(std::shared_ptr<T> ptr) noexcept {
+        return ref_ptr<T>(std::move(ptr));
+    }
 };
 
 template <typename T, typename... Args>
@@ -173,4 +177,9 @@ auto make_ref_ptr_from(T&& obj) -> ref_ptr<typename std::remove_reference<T>::ty
     return ref_ptr<typename std::remove_reference<T>::type>::make(std::forward<T>(obj));
 }
 
+template <typename T>
+ref_ptr<T> _ref_ptr_from_shared_ptr_unsafe(std::shared_ptr<T> ptr) noexcept {
+    return ref_ptr<T>::_from_shared_ptr_unsafe(std::move(ptr));
+}
+
 } // namespace itlib

test/t-ref_ptr-11.cpp

@@ -93,3 +93,13 @@ TEST_CASE("poly") {
     CHECK(a >= d);
     CHECK_FALSE(a < d);
 }
+
+TEST_CASE("unsafe") {
+    auto sp = std::make_shared<int>(55);
+    auto rp = itlib::_ref_ptr_from_shared_ptr_unsafe(sp);
+    CHECK(sp.get() == rp.get());
+    CHECK_FALSE(rp.unique());
+    auto sp2 = rp._as_shared_ptr_unsafe();
+    CHECK(sp == sp2);
+    CHECK(rp.use_count() == 3);
+}