Protobuf v5 support

[Tradias]

The vcpkg team maintains a port of libArcus. Due to standardprojectsettings it is difficult to update the version there to latest. We are stuck with libArcus 4.x for now.

Anyways, neither 5.x nor 4.x support protobuf v5. Can you add support for it? See potential patch here: https://github.com/microsoft/vcpkg/blob/052b06a95da4cee184bab4422e02e7f316055a99/ports/arcus/0001-fix-protobuf-deprecated.patch

[Tradias]

A year later, I am now looking for protobuf v6 support which fails with:

C:\v\buildtrees\arcus\src\4.10.0-cf6ac50ad7.clean\src\MessageTypeStore.cpp(130): error C2664: 'uint32_t hash(const std::string &)': cannot convert argument 1 from 'absl::lts_20250814::string_view' to 'const std::string &'

See protobuf migration guide https://protobuf.dev/support/migration/

Same error with libArcus 5.3.0.

Adding patch to the vcpkg port of libArcus:

@@ -34,9 +34,9 @@ using namespace Arcus;
  * of std::hash differs between compilers, we need to make sure we use the same
  * implementation everywhere.
  */
-uint32_t hash(const std::string& input)
+uint32_t hash(const absl::string_view& input)
 {
-    const char* data = input.c_str();
+    const char* data = input.data();
     uint32_t length = input.size();
     uint32_t result = static_cast<uint32_t>(2166136261UL);
     for(; length; --length)