Merge "libbinder: fix ToString() for smart pointers"
diff --git a/libs/binder/ndk/include_cpp/android/binder_to_string.h b/libs/binder/ndk/include_cpp/android/binder_to_string.h
index bd51b11..5842925 100644
--- a/libs/binder/ndk/include_cpp/android/binder_to_string.h
+++ b/libs/binder/ndk/include_cpp/android/binder_to_string.h
@@ -28,10 +28,22 @@
#include <codecvt>
#include <locale>
+#include <memory>
+#include <optional>
#include <sstream>
#include <string>
#include <type_traits>
+#if __has_include(<utils/StrongPointer.h>)
+#include <utils/StrongPointer.h>
+#define HAS_STRONG_POINTER
+#endif
+
+#if __has_include(<utils/String16.h>)
+#include <utils/String16.h>
+#define HAS_STRING16
+#endif
+
#if __has_include(<android/binder_ibinder.h>)
#include <android/binder_auto_utils.h>
#include <android/binder_interface_utils.h>
@@ -42,9 +54,6 @@
#include <binder/IInterface.h>
#include <binder/ParcelFileDescriptor.h>
#include <binder/ParcelableHolder.h>
-#include <utils/String16.h>
-#include <utils/StrongPointer.h>
-#define HAS_CPP_INTERFACE
#endif //_has_include
namespace android {
@@ -80,11 +89,28 @@
enum { value = decltype(_test<_T>(0))::value };
};
-// Truthy if _T is like a pointer
+template <typename T, template <typename...> typename U>
+struct IsInstantiationOf : std::false_type {};
+
+template <template <typename...> typename U, typename... Args>
+struct IsInstantiationOf<U<Args...>, U> : std::true_type {};
+
+// Truthy if _T is like a pointer: one of sp/optional/shared_ptr
template <typename _T>
class IsPointerLike {
template <typename _U>
- static auto _test(int) -> decltype(!std::declval<_U>(), *std::declval<_U>(), std::true_type());
+ static std::enable_if_t<
+#ifdef HAS_STRONG_POINTER
+ IsInstantiationOf<_U, sp>::value || // for IBinder and interface types in the C++
+ // backend
+#endif
+ IsInstantiationOf<_U, std::optional>::value || // for @nullable types in the
+ // C++/NDK backends
+ IsInstantiationOf<_U, std::shared_ptr>::value, // for interface types in the
+ // NDK backends
+
+ std::true_type>
+ _test(int);
template <typename _U>
static std::false_type _test(...);
@@ -142,12 +168,17 @@
return std::to_string(t);
} else if constexpr (std::is_same_v<std::string, _T>) {
return t;
-#ifdef HAS_CPP_INTERFACE
+#ifdef HAS_STRING16
} else if constexpr (std::is_same_v<String16, _T>) {
std::stringstream out;
out << t;
return out.str();
#endif
+ } else if constexpr (details::IsPointerLike<_T>::value) {
+ if (!t) return "(null)";
+ std::stringstream out;
+ out << ToString(*t);
+ return out.str();
} else if constexpr (details::HasToStringMethod<_T>::value) {
return t.toString();
} else if constexpr (details::HasToStringFunction<_T>::value) {
@@ -168,11 +199,6 @@
}
out << "]";
return out.str();
- } else if constexpr (details::IsPointerLike<_T>::value) {
- if (!t) return "(null)";
- std::stringstream out;
- out << ToString(*t);
- return out.str();
} else {
return "{no toString() implemented}";
}
