[eclipse-iceoryx#488] Implement std::hash for WaitSetAttachmentId

orecham · Oct 31, 2024 · df33977 · df33977
1 parent b1c7f75
commit df33977
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diff --git a/iceoryx2-ffi/cxx/include/iox2/waitset.hpp b/iceoryx2-ffi/cxx/include/iox2/waitset.hpp
@@ -72,6 +72,9 @@ class WaitSetAttachmentId {
     /// Returns true if the deadline for the attachment corresponding to [`WaitSetGuard`] was missed.
     auto has_missed_deadline(const WaitSetGuard<S>& guard) const -> bool;
 
+    /// Returns the a non-secure hash for the [`WaitSetAttachmentId`].
+    auto hash() const -> std::size_t;
+
   private:
     explicit WaitSetAttachmentId(iox2_waitset_attachment_id_h handle);
     template <ServiceType>
@@ -228,4 +231,18 @@ class WaitSetBuilder {
 };
 } // namespace iox2
 
+template <>
+struct std::hash<iox2::WaitSetAttachmentId<iox2::ServiceType::Ipc>> {
+    auto operator()(const iox2::WaitSetAttachmentId<iox2::ServiceType::Ipc>& self) -> std::size_t {
+        return self.hash();
+    }
+};
+
+template <>
+struct std::hash<iox2::WaitSetAttachmentId<iox2::ServiceType::Local>> {
+    auto operator()(const iox2::WaitSetAttachmentId<iox2::ServiceType::Local>& self) -> std::size_t {
+        return self.hash();
+    }
+};
+
 #endif
diff --git a/iceoryx2-ffi/cxx/src/waitset.cpp b/iceoryx2-ffi/cxx/src/waitset.cpp
@@ -68,6 +68,14 @@ void WaitSetAttachmentId<S>::drop() {
     }
 }
 
+template <ServiceType S>
+auto WaitSetAttachmentId<S>::hash() const -> std::size_t {
+    auto len = iox2_waitset_attachment_id_debug_len(&m_handle);
+    std::string empty(len, '\0');
+    iox2_waitset_attachment_id_debug(&m_handle, empty.data(), len);
+    return std::hash<std::string> {}(empty);
+}
+
 template <ServiceType S>
 auto operator==(const WaitSetAttachmentId<S>& lhs, const WaitSetAttachmentId<S>& rhs) -> bool {
     return iox2_waitset_attachment_id_equal(&lhs.m_handle, &rhs.m_handle);