Remove zeek::Span and use std::span instead

src/Span.h

@@ -2,138 +2,11 @@
 
 #pragma once
 
-#include <cstddef>
+#include <span>
-#include <iterator>
-#include <type_traits>
 
 namespace zeek {
 
-/**
- * Drop-in replacement for C++20's @c std::span with dynamic extent only:
- * https://en.cppreference.com/w/cpp/container/span. After upgrading to C++20,
- * this class may get replaced with a type alias instead and/or deprecated.
- */
 template<class T>
-class Span {
+using Span [[deprecated("Remove in v8.1: Use std::span instead")]] = std::span<T>;
-public:
-    // -- member types ---------------------------------------------------------
-
-    using element_type = T;
-
-    using value_type = std::remove_cv_t<T>;
-
-    using index_type = size_t;
-
-    using difference_type = ptrdiff_t;
-
-    using pointer = T*;
-
-    using const_pointer = const T*;
-
-    using reference = T&;
-
-    using const_reference = T&;
-
-    using iterator = pointer;
-
-    using const_iterator = const_pointer;
-
-    using reverse_iterator = std::reverse_iterator<iterator>;
-
-    using const_reverse_iterator = std::reverse_iterator<const_iterator>;
-
-    // -- constructors, destructors, and assignment operators ------------------
-
-    constexpr Span() noexcept : memory_block(nullptr), num_elements(0) {}
-
-    constexpr Span(pointer ptr, size_t size) : memory_block(ptr), num_elements(size) {}
-
-    constexpr Span(pointer first, pointer last)
-        : memory_block(first), num_elements(static_cast<size_t>(last - first)) {}
-
-    template<size_t Size>
-    constexpr Span(element_type (&arr)[Size]) noexcept : memory_block(arr), num_elements(Size) {}
-
-    template<class Container, class Data = typename Container::value_type>
-        requires std::is_convertible_v<Data*, T*>
-    Span(Container& xs) noexcept : memory_block(xs.data()), num_elements(xs.size()) {}
-
-    template<class Container, class Data = typename Container::value_type>
-        requires std::is_convertible_v<const Data*, T*>
-    Span(const Container& xs) noexcept : memory_block(xs.data()), num_elements(xs.size()) {}
-
-    constexpr Span(const Span&) noexcept = default;
-
-    Span& operator=(const Span&) noexcept = default;
-
-    // -- iterators ------------------------------------------------------------
-
-    constexpr iterator begin() const noexcept { return memory_block; }
-
-    constexpr const_iterator cbegin() const noexcept { return memory_block; }
-
-    constexpr iterator end() const noexcept { return begin() + num_elements; }
-
-    constexpr const_iterator cend() const noexcept { return cbegin() + num_elements; }
-
-    constexpr reverse_iterator rbegin() const noexcept { return reverse_iterator{end()}; }
-
-    constexpr const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator{end()}; }
-
-    constexpr reverse_iterator rend() const noexcept { return reverse_iterator{begin()}; }
-
-    constexpr const_reverse_iterator crend() const noexcept { return const_reverse_iterator{begin()}; }
-
-    // -- element access -------------------------------------------------------
-
-    constexpr reference operator[](size_t index) const noexcept { return memory_block[index]; }
-
-    constexpr reference front() const noexcept { return *memory_block; }
-
-    constexpr reference back() const noexcept { return (*this)[num_elements - 1]; }
-
-    // -- properties -----------------------------------------------------------
-
-    constexpr size_t size() const noexcept { return num_elements; }
-
-    constexpr size_t size_bytes() const noexcept { return num_elements * sizeof(element_type); }
-
-    constexpr bool empty() const noexcept { return num_elements == 0; }
-
-    constexpr pointer data() const noexcept { return memory_block; }
-
-    // -- subviews -------------------------------------------------------------
-
-    constexpr Span subspan(size_t offset, size_t count) const { return {memory_block + offset, count}; }
-
-    constexpr Span subspan(size_t offset) const { return {memory_block + offset, num_elements - offset}; }
-
-    constexpr Span first(size_t count) const { return {memory_block, count}; }
-
-    constexpr Span last(size_t count) const { return subspan(num_elements - count, num_elements); }
-
-private:
-    // -- member variables -----------------------------------------------------
-
-    /// Points to the first element in the contiguous memory block.
-    pointer memory_block;
-
-    /// Stores the number of elements in the contiguous memory block.
-    size_t num_elements;
-};
-
-// -- deduction guides ---------------------------------------------------------
-
-template<class T>
-Span(T*, size_t) -> Span<T>;
-
-template<class T, size_t N>
-Span(T (&)[N]) -> Span<T>;
-
-template<class Container>
-Span(Container&) -> Span<typename Container::value_type>;
-
-template<class Container>
-Span(const Container&) -> Span<const typename Container::value_type>;
 
 } // namespace zeek

src/broker/Manager.h

@@ -11,12 +11,12 @@
 #include <broker/store.hh>
 #include <broker/zeek.hh>
 #include <memory>
+#include <span>
 #include <stdexcept>
 #include <string>
 #include <unordered_map>
 
 #include "zeek/IntrusivePtr.h"
-#include "zeek/Span.h"
 #include "zeek/broker/Data.h"
 #include "zeek/cluster/Backend.h"
 #include "zeek/iosource/IOSource.h"
@@ -284,7 +284,7 @@ public:
     [[deprecated("Remove in v8.1: Use the ArgsSpan version instead")]] RecordVal* MakeEvent(ValPList* args,
                                                                                             zeek::detail::Frame* frame);
 
-    using ArgsSpan = Span<const ValPtr>;
+    using ArgsSpan = std::span<const ValPtr>;
 
     /**
      * Create an `Event` record value from an event and its arguments.
@@ -433,7 +433,7 @@ private:
     //
     // TODO: Move log buffering out of broker and implement.
     bool DoPublishLogWrites(const logging::detail::LogWriteHeader& header,
-                            zeek::Span<logging::detail::LogRecord> records) override {
+                            std::span<logging::detail::LogRecord> records) override {
         // Not implemented by broker.
         throw std::logic_error("not implemented");
     }

src/broker/messaging.bif

@@ -3,15 +3,15 @@
 
 %%{
 #include <set>
+#include <span>
 #include <string>
 
-#include "zeek/Span.h"
 #include "zeek/broker/Manager.h"
 #include "zeek/logging/Manager.h"
 
 namespace {
 
-using ArgsSpan = zeek::Span<const zeek::ValPtr>;
+using ArgsSpan = std::span<const zeek::ValPtr>;
 
 }
 

src/cluster/Backend.cc

@@ -4,6 +4,7 @@
 
 #include <memory>
 #include <optional>
+#include <span>
 
 #include "zeek/Desc.h"
 #include "zeek/Event.h"
@@ -196,7 +197,7 @@ bool Backend::DoPublishEvent(const std::string& topic, cluster::detail::Event& e
 
 // Default implementation doing log record serialization.
 bool Backend::DoPublishLogWrites(const zeek::logging::detail::LogWriteHeader& header,
-                                 zeek::Span<zeek::logging::detail::LogRecord> records) {
+                                 std::span<zeek::logging::detail::LogRecord> records) {
     byte_buffer buf;
 
     if ( ! log_serializer->SerializeLogWrite(buf, header, records) )

src/cluster/Backend.h

@@ -6,12 +6,12 @@
 
 #include <memory>
 #include <optional>
+#include <span>
 #include <string_view>
 #include <variant>
 
 #include "zeek/Event.h"
 #include "zeek/EventHandler.h"
-#include "zeek/Span.h"
 #include "zeek/Tag.h"
 #include "zeek/Val.h"
 #include "zeek/ZeekArgs.h"
@@ -323,7 +323,7 @@ public:
      * @param records A span of logging::detail::LogRecords to be published.
      */
     bool PublishLogWrites(const zeek::logging::detail::LogWriteHeader& header,
-                          zeek::Span<zeek::logging::detail::LogRecord> records) {
+                          std::span<zeek::logging::detail::LogRecord> records) {
         return DoPublishLogWrites(header, records);
     }
 
@@ -531,7 +531,7 @@ private:
      * @return true if the message has been published successfully.
      */
     virtual bool DoPublishLogWrites(const zeek::logging::detail::LogWriteHeader& header,
-                                    zeek::Span<zeek::logging::detail::LogRecord> records);
+                                    std::span<zeek::logging::detail::LogRecord> records);
 
     /**
      * Send out a serialized log batch.
@@ -589,7 +589,7 @@ struct EventMessage {
     std::string format;
     byte_buffer payload;
 
-    auto payload_span() const { return Span(payload.data(), payload.size()); };
+    auto payload_span() const { return std::span(payload.data(), payload.size()); };
 };
 
 /**
@@ -599,7 +599,7 @@ struct LogMessage {
     std::string format;
     byte_buffer payload;
 
-    auto payload_span() const { return Span(payload.data(), payload.size()); };
+    auto payload_span() const { return std::span(payload.data(), payload.size()); };
 };
 
 /**
@@ -612,7 +612,7 @@ struct BackendMessage {
     int tag;
     byte_buffer payload;
 
-    auto payload_span() const { return Span(payload.data(), payload.size()); };
+    auto payload_span() const { return std::span(payload.data(), payload.size()); };
 };
 
 using QueueMessage = std::variant<EventMessage, LogMessage, BackendMessage>;

src/cluster/BifSupport.cc

@@ -2,6 +2,8 @@
 
 #include "zeek/cluster/BifSupport.h"
 
+#include <span>
+
 #include "zeek/Desc.h"
 #include "zeek/Event.h"
 #include "zeek/EventRegistry.h"
@@ -30,7 +32,7 @@ std::optional<zeek::cluster::detail::Event> to_cluster_event(const zeek::cluster
     for ( size_t i = 0; i < vargs->Size(); i++ )
         args[i] = vargs->ValAt(i);
 
-    return backend->MakeClusterEvent(func, zeek::Span{args});
+    return backend->MakeClusterEvent(func, std::span{args});
 }
 } // namespace
 
@@ -155,7 +157,7 @@ zeek::RecordValPtr make_endpoint_info(const std::string& id, const std::string&
     return ep_rec;
 }
 
-zeek::VectorValPtr make_string_vec(zeek::Span<const std::string> strings) {
+zeek::VectorValPtr make_string_vec(std::span<const std::string> strings) {
     static const auto string_vec_type = zeek::id::find_type<zeek::VectorType>("string_vec");
     auto vec = zeek::make_intrusive<zeek::VectorVal>(string_vec_type);
     vec->Reserve(strings.size());

src/cluster/BifSupport.h

@@ -3,10 +3,10 @@
 #pragma once
 
 #include <optional>
+#include <span>
 #include <string>
 
 #include "zeek/IntrusivePtr.h"
-#include "zeek/Span.h"
 #include "zeek/net_util.h"
 
 // Helpers for cluster.bif
@@ -24,7 +24,7 @@ using VectorValPtr = IntrusivePtr<VectorVal>;
 
 class Val;
 using ValPtr = IntrusivePtr<Val>;
-using ArgsSpan = Span<const ValPtr>;
+using ArgsSpan = std::span<const ValPtr>;
 
 namespace cluster::detail::bif {
 
@@ -72,7 +72,7 @@ zeek::RecordValPtr make_endpoint_info(const std::string& id, const std::string&
  *
  * @return a VectorVal instance of type string_vec filled with strings.
  */
-zeek::VectorValPtr make_string_vec(zeek::Span<const std::string> strings);
+zeek::VectorValPtr make_string_vec(std::span<const std::string> strings);
 
 } // namespace cluster::detail::bif
 

src/cluster/Serializer.h

@@ -5,9 +5,9 @@
 #pragma once
 
 #include <optional>
+#include <span>
 #include <string>
 
-#include "zeek/Span.h"
 #include "zeek/logging/Types.h"
 
 namespace zeek::cluster {
@@ -80,7 +80,7 @@ public:
      * @param records The actual log writes.
      */
     virtual bool SerializeLogWrite(byte_buffer& buf, const logging::detail::LogWriteHeader& header,
-                                   zeek::Span<logging::detail::LogRecord> records) = 0;
+                                   std::span<logging::detail::LogRecord> records) = 0;
 
     /**
      * Unserialize log writes from a given byte buffer.

src/cluster/Telemetry.cc

@@ -3,6 +3,7 @@
 #include "zeek/cluster/Telemetry.h"
 
 #include <cinttypes>
+#include <span>
 
 #include "zeek/Desc.h"
 #include "zeek/Expr.h"
@@ -187,7 +188,7 @@ DebugTelemetry::DebugTelemetry(TopicNormalizer topic_normalizer, std::string_vie
     labels.emplace_back("script_location", "");
 
     labels_view = to_label_view_vec(labels);
-    labels_view_no_location = zeek::Span{labels_view.data(), labels_view.size() - 1};
+    labels_view_no_location = std::span{labels_view.data(), labels_view.size() - 1};
 
     auto label_names = to_label_names_vec(labels);
 

src/cluster/Telemetry.h

@@ -6,12 +6,12 @@
 #include <cstdint>
 #include <functional>
 #include <memory>
+#include <span>
 #include <string>
 #include <string_view>
 #include <vector>
 
 #include "zeek/IntrusivePtr.h"
-#include "zeek/Span.h"
 
 
 namespace zeek {
@@ -175,7 +175,7 @@ private:
     std::vector<double> size_bounds;
     LabelList labels;
     LabelViewList labels_view;
-    zeek::Span<telemetry::LabelView> labels_view_no_location;
+    std::span<telemetry::LabelView> labels_view_no_location;
     size_t topic_idx, handler_idx,
         script_location_idx; // Index of topic, handler and script_location labels in labels_view
     telemetry::HistogramFamilyPtr in, out;

src/cluster/serializer/binary-serialization-format/Serializer.cc

@@ -3,6 +3,7 @@
 #include "zeek/cluster/serializer/binary-serialization-format/Serializer.h"
 
 #include <cstdint>
+#include <span>
 
 #include "zeek/DebugLogger.h"
 #include "zeek/ID.h"
@@ -27,7 +28,7 @@ extern Plugin plugin;
 
 bool detail::BinarySerializationFormatLogSerializer::SerializeLogWrite(byte_buffer& buf,
                                                                        const logging::detail::LogWriteHeader& header,
-                                                                       zeek::Span<logging::detail::LogRecord> records) {
+                                                                       std::span<logging::detail::LogRecord> records) {
     zeek::detail::BinarySerializationFormat fmt;
 
     SERIALIZER_DEBUG("Serializing stream=%s writer=%s filter=%s path=%s num_fields=%zu num_records=%zu",

src/cluster/serializer/binary-serialization-format/Serializer.h

@@ -3,6 +3,7 @@
 #pragma once
 
 #include <optional>
+#include <span>
 
 #include "zeek/cluster/Serializer.h"
 #include "zeek/logging/Types.h"
@@ -14,7 +15,7 @@ public:
     BinarySerializationFormatLogSerializer() : LogSerializer("zeek-bin-serializer") {}
 
     bool SerializeLogWrite(byte_buffer& buf, const logging::detail::LogWriteHeader& header,
-                           zeek::Span<logging::detail::LogRecord> records) override;
+                           std::span<logging::detail::LogRecord> records) override;
 
     std::optional<logging::detail::LogWriteBatch> UnserializeLogWrite(byte_buffer_span buf) override;
 };

src/logging/WriterBackend.cc

@@ -3,6 +3,7 @@
 #include "zeek/logging/WriterBackend.h"
 
 #include <broker/data.hh>
+#include <span>
 
 #include "zeek/logging/Manager.h"
 #include "zeek/logging/WriterFrontend.h"
@@ -170,7 +171,7 @@ bool WriterBackend::Init(int arg_num_fields, const Field* const* arg_fields) {
     return true;
 }
 
-bool WriterBackend::Write(int arg_num_fields, zeek::Span<detail::LogRecord> records) {
+bool WriterBackend::Write(int arg_num_fields, std::span<detail::LogRecord> records) {
     // Double-check that the arguments match. If we get this from remote,
     // something might be mixed up.
     if ( num_fields != arg_num_fields ) {

src/logging/WriterBackend.h

@@ -4,7 +4,8 @@
 
 #pragma once
 
-#include "zeek/Span.h"
+#include <span>
+
 #include "zeek/logging/Component.h"
 #include "zeek/logging/Types.h"
 #include "zeek/threading/MsgThread.h"
@@ -154,7 +155,7 @@ public:
      *
      * @return False if an error occurred.
      */
-    bool Write(int arg_num_fields, zeek::Span<detail::LogRecord> records);
+    bool Write(int arg_num_fields, std::span<detail::LogRecord> records);
 
     /**
      * Sets the buffering status for the writer, assuming the writer

src/logging/WriterFrontend.cc

@@ -2,8 +2,9 @@
 
 #include "zeek/logging/WriterFrontend.h"
 
+#include <span>
+
 #include "zeek/RunState.h"
-#include "zeek/Span.h"
 #include "zeek/broker/Manager.h"
 #include "zeek/cluster/Backend.h"
 #include "zeek/logging/Manager.h"
@@ -59,7 +60,7 @@ public:
           num_fields(num_fields),
           records(std::move(records)) {}
 
-    bool Process() override { return Object()->Write(num_fields, zeek::Span{records}); }
+    bool Process() override { return Object()->Write(num_fields, std::span{records}); }
 
 private:
     int num_fields;
@@ -234,7 +235,7 @@ void WriterFrontend::FlushWriteBuffer() {
     // is used, push all the buffered log records to it now.
     const bool broker_is_cluster_backend = zeek::cluster::backend == zeek::broker_mgr;
     if ( remote && ! broker_is_cluster_backend )
-        zeek::cluster::backend->PublishLogWrites(header, Span{records});
+        zeek::cluster::backend->PublishLogWrites(header, std::span{records});
 
     if ( backend )
         backend->SendIn(new WriteMessage(backend, num_fields, std::move(records)));

src/packet_analysis/Manager.cc

@@ -2,6 +2,8 @@
 
 #include "zeek/packet_analysis/Manager.h"
 
+#include <span>
+
 #include "zeek/Event.h"
 #include "zeek/RunState.h"
 #include "zeek/Stats.h"
@@ -251,8 +253,8 @@ void Manager::ReportUnknownProtocol(const std::string& analyzer, uint32_t protoc
     }
 }
 
-std::vector<zeek::Span<const uint8_t>> Manager::GetAnalyzerData(const AnalyzerPtr& analyzer) {
+std::vector<std::span<const uint8_t>> Manager::GetAnalyzerData(const AnalyzerPtr& analyzer) {
-    std::vector<zeek::Span<const uint8_t>> result;
+    std::vector<std::span<const uint8_t>> result;
     for ( const auto [sa, span] : analyzer_stack ) {
         if ( sa == analyzer.get() )
             result.push_back(span);

src/packet_analysis/Manager.h

@@ -2,6 +2,8 @@
 
 #pragma once
 
+#include <span>
+
 #include "zeek/PacketFilter.h"
 #include "zeek/Tag.h"
 #include "zeek/iosource/Packet.h"
@@ -195,7 +197,7 @@ public:
      *
      * @returns An array of data spans.
      */
-    std::vector<zeek::Span<const uint8_t>> GetAnalyzerData(const AnalyzerPtr& analyzer);
+    std::vector<std::span<const uint8_t>> GetAnalyzerData(const AnalyzerPtr& analyzer);
 
 private:
     /**
@@ -248,7 +250,7 @@ private:
 
     struct StackEntry {
         const Analyzer* analyzer;
-        zeek::Span<const uint8_t> data; // Start of this layer, limited by span's size.
+        std::span<const uint8_t> data; // Start of this layer, limited by span's size.
     };
 
     std::vector<StackEntry> analyzer_stack;

src/packet_analysis/protocol/geneve/Geneve.cc

@@ -2,13 +2,14 @@
 
 #include "zeek/packet_analysis/protocol/geneve/Geneve.h"
 
-#include "zeek/Span.h"
+#include <span>
+
 #include "zeek/packet_analysis/protocol/geneve/events.bif.h"
 #include "zeek/packet_analysis/protocol/iptunnel/IPTunnel.h"
 
 using namespace zeek::packet_analysis::Geneve;
 
-void zeek::packet_analysis::Geneve::detail::parse_options(zeek::Span<const uint8_t> data, detail::Callback cb) {
+void zeek::packet_analysis::Geneve::detail::parse_options(std::span<const uint8_t> data, detail::Callback cb) {
     size_t remaining = data.size();
 
     if ( remaining < 8 )
@@ -40,7 +41,7 @@ void zeek::packet_analysis::Geneve::detail::parse_options(zeek::Span<const uint8
         if ( remaining < opt_len )
             break;
 
-        cb(opt_class, opt_critical, opt_type, zeek::Span{p, opt_len});
+        cb(opt_class, opt_critical, opt_type, std::span{p, opt_len});
 
         p += opt_len;
     }

src/packet_analysis/protocol/geneve/Geneve.h

@@ -4,8 +4,8 @@
 
 #include <cstdint>
 #include <functional>
+#include <span>
 
-#include "zeek/Span.h"
 #include "zeek/iosource/Packet.h"
 #include "zeek/packet_analysis/Analyzer.h"
 
@@ -17,7 +17,7 @@ namespace detail {
  * Callback for parse_options(), passing the individual option pieces.
  */
 using Callback =
-    std::function<void(uint16_t opt_class, bool opt_critical, uint8_t opt_type, zeek::Span<const uint8_t> opt_data)>;
+    std::function<void(uint16_t opt_class, bool opt_critical, uint8_t opt_type, std::span<const uint8_t> opt_data)>;
 
 /**
  * Parse Geneve options from the header data.
@@ -27,7 +27,7 @@ using Callback =
  * @param data The data span to treat as a Geneve header.
  * @param cb The callback to invoke with each parsed option.
  */
-void parse_options(zeek::Span<const uint8_t> data, Callback cb);
+void parse_options(std::span<const uint8_t> data, Callback cb);
 
 } // namespace detail
 

src/packet_analysis/protocol/geneve/functions.bif

@@ -1,6 +1,7 @@
 module PacketAnalyzer::Geneve;
 
 %%{
+#include <span>
 #include "zeek/packet_analysis/Manager.h"
 #include "zeek/packet_analysis/protocol/geneve/Geneve.h"
 %%}
@@ -24,7 +25,7 @@ function get_options%(%): geneve_options_vec_vec
 
     for ( const auto& span : spans ) {
         auto v = zeek::make_intrusive<zeek::VectorVal>(vtype);
-        auto cb = [&v](uint16_t opt_class, bool opt_critical, uint8_t opt_type, zeek::Span<const uint8_t> opt_data) -> void {
+        auto cb = [&v](uint16_t opt_class, bool opt_critical, uint8_t opt_type, std::span<const uint8_t> opt_data) -> void {
             auto rv = zeek::make_intrusive<zeek::RecordVal>(rtype);
             rv->Assign(0, zeek::val_mgr->Count(opt_class));
             rv->Assign(1, zeek::val_mgr->Bool(opt_critical));

src/telemetry/Counter.cc

@@ -3,6 +3,7 @@
 #include "zeek/telemetry/Counter.h"
 
 #include <algorithm>
+#include <span>
 
 using namespace zeek::telemetry;
 
@@ -16,7 +17,8 @@ double Counter::Value() const noexcept {
     return handle.Value();
 }
 
-std::shared_ptr<Counter> CounterFamily::GetOrAdd(Span<const LabelView> labels, detail::CollectCallbackPtr callback) {
+std::shared_ptr<Counter> CounterFamily::GetOrAdd(std::span<const LabelView> labels,
+                                                 detail::CollectCallbackPtr callback) {
     prometheus::Labels p_labels = detail::BuildPrometheusLabels(labels);
 
     auto check = [&](const std::shared_ptr<Counter>& counter) { return counter->CompareLabels(p_labels); };
@@ -31,7 +33,7 @@ std::shared_ptr<Counter> CounterFamily::GetOrAdd(Span<const LabelView> labels, d
 
 std::shared_ptr<Counter> CounterFamily::GetOrAdd(std::initializer_list<LabelView> labels,
                                                  detail::CollectCallbackPtr callback) {
-    return GetOrAdd(Span{labels.begin(), labels.size()}, std::move(callback));
+    return GetOrAdd(std::span{labels.begin(), labels.size()}, std::move(callback));
 }
 
 void CounterFamily::RunCallbacks() {

src/telemetry/Counter.h

@@ -6,9 +6,9 @@
 #include <prometheus/family.h>
 #include <initializer_list>
 #include <memory>
+#include <span>
 
 #include "zeek/NetVar.h" // For BifEnum::Telemetry value
-#include "zeek/Span.h"
 #include "zeek/telemetry/MetricFamily.h"
 #include "zeek/telemetry/Utils.h"
 
@@ -84,14 +84,14 @@ class CounterFamily : public MetricFamily {
 public:
     static inline const char* OpaqueName = "CounterMetricFamilyVal";
 
-    CounterFamily(prometheus::Family<prometheus::Counter>* family, Span<const std::string_view> labels)
+    CounterFamily(prometheus::Family<prometheus::Counter>* family, std::span<const std::string_view> labels)
         : MetricFamily(labels), family(family) {}
 
     /**
      * Returns the metrics handle for given labels, creating a new instance
      * lazily if necessary.
      */
-    CounterPtr GetOrAdd(Span<const LabelView> labels, detail::CollectCallbackPtr callback = nullptr);
+    CounterPtr GetOrAdd(std::span<const LabelView> labels, detail::CollectCallbackPtr callback = nullptr);
 
     /**
      * @copydoc GetOrAdd

src/telemetry/Gauge.cc

@@ -3,6 +3,7 @@
 #include "zeek/telemetry/Gauge.h"
 
 #include <algorithm>
+#include <span>
 
 using namespace zeek::telemetry;
 
@@ -17,7 +18,7 @@ double Gauge::Value() const noexcept {
 Gauge::Gauge(FamilyType* family, const prometheus::Labels& labels, detail::CollectCallbackPtr callback) noexcept
     : family(family), handle(family->Add(labels)), labels(labels), callback(std::move(callback)) {}
 
-std::shared_ptr<Gauge> GaugeFamily::GetOrAdd(Span<const LabelView> labels, detail::CollectCallbackPtr callback) {
+std::shared_ptr<Gauge> GaugeFamily::GetOrAdd(std::span<const LabelView> labels, detail::CollectCallbackPtr callback) {
     prometheus::Labels p_labels = detail::BuildPrometheusLabels(labels);
 
     auto check = [&](const std::shared_ptr<Gauge>& gauge) { return gauge->CompareLabels(p_labels); };
@@ -32,7 +33,7 @@ std::shared_ptr<Gauge> GaugeFamily::GetOrAdd(Span<const LabelView> labels, detai
 
 std::shared_ptr<Gauge> GaugeFamily::GetOrAdd(std::initializer_list<LabelView> labels,
                                              detail::CollectCallbackPtr callback) {
-    return GetOrAdd(Span{labels.begin(), labels.size()}, std::move(callback));
+    return GetOrAdd(std::span{labels.begin(), labels.size()}, std::move(callback));
 }
 
 void GaugeFamily::RunCallbacks() {

src/telemetry/Gauge.h

@@ -7,9 +7,9 @@
 #include <unistd.h>
 #include <initializer_list>
 #include <memory>
+#include <span>
 
 #include "zeek/NetVar.h" // For BifEnum::Telemetry value
-#include "zeek/Span.h"
 #include "zeek/telemetry/MetricFamily.h"
 #include "zeek/telemetry/Utils.h"
 
@@ -103,7 +103,7 @@ public:
      * Returns the metrics handle for given labels, creating a new instance
      * lazily if necessary.
      */
-    GaugePtr GetOrAdd(Span<const LabelView> labels, detail::CollectCallbackPtr callback = nullptr);
+    GaugePtr GetOrAdd(std::span<const LabelView> labels, detail::CollectCallbackPtr callback = nullptr);
 
     /**
      * @copydoc GetOrAdd
@@ -112,7 +112,7 @@ public:
 
     zeek_int_t MetricType() const noexcept override { return BifEnum::Telemetry::MetricType::GAUGE; }
 
-    GaugeFamily(prometheus::Family<prometheus::Gauge>* family, Span<const std::string_view> labels)
+    GaugeFamily(prometheus::Family<prometheus::Gauge>* family, std::span<const std::string_view> labels)
         : MetricFamily(labels), family(family) {}
 
     void RunCallbacks() override;

src/telemetry/Histogram.cc

@@ -3,6 +3,7 @@
 #include "zeek/telemetry/Histogram.h"
 
 #include <algorithm>
+#include <span>
 
 using namespace zeek::telemetry;
 
@@ -15,7 +16,7 @@ Histogram::Histogram(FamilyType* family, const prometheus::Labels& labels,
                      prometheus::Histogram::BucketBoundaries bounds) noexcept
     : handle(family->Add(labels, std::move(bounds))), labels(labels) {}
 
-std::shared_ptr<Histogram> HistogramFamily::GetOrAdd(Span<const LabelView> labels) {
+std::shared_ptr<Histogram> HistogramFamily::GetOrAdd(std::span<const LabelView> labels) {
     prometheus::Labels p_labels = detail::BuildPrometheusLabels(labels);
 
     auto check = [&](const std::shared_ptr<Histogram>& histo) { return histo->CompareLabels(p_labels); };
@@ -32,11 +33,11 @@ std::shared_ptr<Histogram> HistogramFamily::GetOrAdd(Span<const LabelView> label
  * @copydoc GetOrAdd
  */
 std::shared_ptr<Histogram> HistogramFamily::GetOrAdd(std::initializer_list<LabelView> labels) {
-    return GetOrAdd(Span{labels.begin(), labels.size()});
+    return GetOrAdd(std::span{labels.begin(), labels.size()});
 }
 
-HistogramFamily::HistogramFamily(prometheus::Family<prometheus::Histogram>* family, Span<const double> bounds,
+HistogramFamily::HistogramFamily(prometheus::Family<prometheus::Histogram>* family, std::span<const double> bounds,
-                                 Span<const std::string_view> labels)
+                                 std::span<const std::string_view> labels)
     : MetricFamily(labels), family(family) {
     std::ranges::copy(bounds, std::back_inserter(boundaries));
 }

src/telemetry/Histogram.h

@@ -6,9 +6,9 @@
 #include <prometheus/histogram.h>
 #include <initializer_list>
 #include <memory>
+#include <span>
 
 #include "zeek/NetVar.h" // For BifEnum::Telemetry values
-#include "zeek/Span.h"
 #include "zeek/telemetry/MetricFamily.h"
 #include "zeek/telemetry/Utils.h"
 
@@ -49,14 +49,14 @@ class HistogramFamily : public MetricFamily {
 public:
     static inline const char* OpaqueName = "HistogramMetricFamilyVal";
 
-    HistogramFamily(prometheus::Family<prometheus::Histogram>* family, Span<const double> bounds,
+    HistogramFamily(prometheus::Family<prometheus::Histogram>* family, std::span<const double> bounds,
-                    Span<const std::string_view> labels);
+                    std::span<const std::string_view> labels);
 
     /**
      * Returns the metrics handle for given labels, creating a new instance
      * lazily if necessary.
      */
-    HistogramPtr GetOrAdd(Span<const LabelView> labels);
+    HistogramPtr GetOrAdd(std::span<const LabelView> labels);
 
     /**
      * @copydoc GetOrAdd

src/telemetry/Manager.cc

@@ -14,6 +14,7 @@
 #include <rapidjson/document.h>
 #include <rapidjson/writer.h>
 #include <algorithm>
+#include <span>
 #include <thread>
 
 #include "zeek/Func.h"
@@ -502,7 +503,7 @@ void Manager::BuildClusterJson() {
 }
 
 CounterFamilyPtr Manager::CounterFamily(std::string_view prefix, std::string_view name,
-                                        Span<const std::string_view> labels, std::string_view helptext,
+                                        std::span<const std::string_view> labels, std::string_view helptext,
                                         std::string_view unit) {
     auto full_name = detail::BuildFullPrometheusName(prefix, name, unit, true);
 
@@ -520,11 +521,11 @@ CounterFamilyPtr Manager::CounterFamily(std::string_view prefix, std::string_vie
 CounterFamilyPtr Manager::CounterFamily(std::string_view prefix, std::string_view name,
                                         std::initializer_list<std::string_view> labels, std::string_view helptext,
                                         std::string_view unit) {
-    auto lbl_span = Span{labels.begin(), labels.size()};
+    auto lbl_span = std::span{labels.begin(), labels.size()};
     return CounterFamily(prefix, name, lbl_span, helptext, unit);
 }
 
-CounterPtr Manager::CounterInstance(std::string_view prefix, std::string_view name, Span<const LabelView> labels,
+CounterPtr Manager::CounterInstance(std::string_view prefix, std::string_view name, std::span<const LabelView> labels,
                                     std::string_view helptext, std::string_view unit,
                                     detail::CollectCallbackPtr callback) {
     return WithLabelNames(labels, [&, this](auto labelNames) {
@@ -536,12 +537,12 @@ CounterPtr Manager::CounterInstance(std::string_view prefix, std::string_view na
 CounterPtr Manager::CounterInstance(std::string_view prefix, std::string_view name,
                                     std::initializer_list<LabelView> labels, std::string_view helptext,
                                     std::string_view unit, detail::CollectCallbackPtr callback) {
-    auto lbl_span = Span{labels.begin(), labels.size()};
+    auto lbl_span = std::span{labels.begin(), labels.size()};
     return CounterInstance(prefix, name, lbl_span, helptext, unit, std::move(callback));
 }
 
 std::shared_ptr<GaugeFamily> Manager::GaugeFamily(std::string_view prefix, std::string_view name,
-                                                  Span<const std::string_view> labels, std::string_view helptext,
+                                                  std::span<const std::string_view> labels, std::string_view helptext,
                                                   std::string_view unit) {
     auto full_name = detail::BuildFullPrometheusName(prefix, name, unit, false);
 
@@ -559,11 +560,11 @@ std::shared_ptr<GaugeFamily> Manager::GaugeFamily(std::string_view prefix, std::
 GaugeFamilyPtr Manager::GaugeFamily(std::string_view prefix, std::string_view name,
                                     std::initializer_list<std::string_view> labels, std::string_view helptext,
                                     std::string_view unit) {
-    auto lbl_span = Span{labels.begin(), labels.size()};
+    auto lbl_span = std::span{labels.begin(), labels.size()};
     return GaugeFamily(prefix, name, lbl_span, helptext, unit);
 }
 
-GaugePtr Manager::GaugeInstance(std::string_view prefix, std::string_view name, Span<const LabelView> labels,
+GaugePtr Manager::GaugeInstance(std::string_view prefix, std::string_view name, std::span<const LabelView> labels,
                                 std::string_view helptext, std::string_view unit, detail::CollectCallbackPtr callback) {
     return WithLabelNames(labels, [&, this](auto labelNames) {
         auto family = GaugeFamily(prefix, name, labelNames, helptext, unit);
@@ -573,12 +574,12 @@ GaugePtr Manager::GaugeInstance(std::string_view prefix, std::string_view name,
 
 GaugePtr Manager::GaugeInstance(std::string_view prefix, std::string_view name, std::initializer_list<LabelView> labels,
                                 std::string_view helptext, std::string_view unit, detail::CollectCallbackPtr callback) {
-    auto lbl_span = Span{labels.begin(), labels.size()};
+    auto lbl_span = std::span{labels.begin(), labels.size()};
     return GaugeInstance(prefix, name, lbl_span, helptext, unit, std::move(callback));
 }
 
 HistogramFamilyPtr Manager::HistogramFamily(std::string_view prefix, std::string_view name,
-                                            Span<const std::string_view> labels, ConstSpan<double> bounds,
+                                            std::span<const std::string_view> labels, std::span<const double> bounds,
                                             std::string_view helptext, std::string_view unit) {
     auto full_name = detail::BuildFullPrometheusName(prefix, name, unit);
 
@@ -594,14 +595,16 @@ HistogramFamilyPtr Manager::HistogramFamily(std::string_view prefix, std::string
 }
 
 HistogramFamilyPtr Manager::HistogramFamily(std::string_view prefix, std::string_view name,
-                                            std::initializer_list<std::string_view> labels, ConstSpan<double> bounds,
+                                            std::initializer_list<std::string_view> labels,
-                                            std::string_view helptext, std::string_view unit) {
+                                            std::span<const double> bounds, std::string_view helptext,
-    auto lbl_span = Span{labels.begin(), labels.size()};
+                                            std::string_view unit) {
+    auto lbl_span = std::span{labels.begin(), labels.size()};
     return HistogramFamily(prefix, name, lbl_span, bounds, helptext, unit);
 }
 
-HistogramPtr Manager::HistogramInstance(std::string_view prefix, std::string_view name, Span<const LabelView> labels,
+HistogramPtr Manager::HistogramInstance(std::string_view prefix, std::string_view name,
-                                        ConstSpan<double> bounds, std::string_view helptext, std::string_view unit) {
+                                        std::span<const LabelView> labels, std::span<const double> bounds,
+                                        std::string_view helptext, std::string_view unit) {
     return WithLabelNames(labels, [&, this](auto labelNames) {
         auto family = HistogramFamily(prefix, name, labelNames, bounds, helptext, unit);
         return family->GetOrAdd(labels);
@@ -611,8 +614,8 @@ HistogramPtr Manager::HistogramInstance(std::string_view prefix, std::string_vie
 HistogramPtr Manager::HistogramInstance(std::string_view prefix, std::string_view name,
                                         std::initializer_list<LabelView> labels, std::initializer_list<double> bounds,
                                         std::string_view helptext, std::string_view unit) {
-    auto lbls = Span{labels.begin(), labels.size()};
+    auto lbls = std::span{labels.begin(), labels.size()};
-    auto bounds_span = Span{bounds.begin(), bounds.size()};
+    auto bounds_span = std::span{bounds.begin(), bounds.size()};
     return HistogramInstance(prefix, name, lbls, bounds_span, helptext, unit);
 }
 

src/telemetry/Manager.h

@@ -6,12 +6,12 @@
 #include <cstdint>
 #include <initializer_list>
 #include <memory>
+#include <span>
 #include <string_view>
 #include <vector>
 
 #include "zeek/Flare.h"
 #include "zeek/IntrusivePtr.h"
-#include "zeek/Span.h"
 #include "zeek/iosource/IOSource.h"
 #include "zeek/telemetry/Counter.h"
 #include "zeek/telemetry/Gauge.h"
@@ -81,8 +81,9 @@ public:
      * @param helptext Short explanation of the metric.
      * @param unit Unit of measurement.
      */
-    CounterFamilyPtr CounterFamily(std::string_view prefix, std::string_view name, Span<const std::string_view> labels,
+    CounterFamilyPtr CounterFamily(std::string_view prefix, std::string_view name,
-                                   std::string_view helptext, std::string_view unit = "");
+                                   std::span<const std::string_view> labels, std::string_view helptext,
+                                   std::string_view unit = "");
 
     /// @copydoc CounterFamily
     CounterFamilyPtr CounterFamily(std::string_view prefix, std::string_view name,
@@ -100,7 +101,7 @@ public:
      * @param callback Passing a callback method will enable asynchronous mode. The callback method will be called
      * by the metrics subsystem whenever data is requested.
      */
-    CounterPtr CounterInstance(std::string_view prefix, std::string_view name, Span<const LabelView> labels,
+    CounterPtr CounterInstance(std::string_view prefix, std::string_view name, std::span<const LabelView> labels,
                                std::string_view helptext, std::string_view unit = "",
                                detail::CollectCallbackPtr callback = nullptr);
 
@@ -117,7 +118,7 @@ public:
      * @param helptext Short explanation of the metric.
      * @param unit Unit of measurement.
      */
-    GaugeFamilyPtr GaugeFamily(std::string_view prefix, std::string_view name, Span<const std::string_view> labels,
+    GaugeFamilyPtr GaugeFamily(std::string_view prefix, std::string_view name, std::span<const std::string_view> labels,
                                std::string_view helptext, std::string_view unit = "");
 
     /// @copydoc GaugeFamily
@@ -136,7 +137,7 @@ public:
      * @param callback Passing a callback method will enable asynchronous mode. The callback method will be called
      * by the metrics subsystem whenever data is requested.
      */
-    GaugePtr GaugeInstance(std::string_view prefix, std::string_view name, Span<const LabelView> labels,
+    GaugePtr GaugeInstance(std::string_view prefix, std::string_view name, std::span<const LabelView> labels,
                            std::string_view helptext, std::string_view unit = "",
                            detail::CollectCallbackPtr callback = nullptr);
 
@@ -145,17 +146,6 @@ public:
                            std::string_view helptext, std::string_view unit = "",
                            detail::CollectCallbackPtr callback = nullptr);
 
-    // Forces the compiler to use the type `Span<const T>` instead of trying to
-    // match parameters to a `span`.
-    template<class T>
-    struct ConstSpanOracle {
-        using Type = Span<const T>;
-    };
-
-    // Convenience alias to safe some typing.
-    template<class T>
-    using ConstSpan = typename ConstSpanOracle<T>::Type;
-
     /**
      * Returns a histogram metric family. Creates the family lazily if
      * necessary.
@@ -175,12 +165,12 @@ public:
      *       @p bounds via run-time configuration.
      */
     HistogramFamilyPtr HistogramFamily(std::string_view prefix, std::string_view name,
-                                       Span<const std::string_view> labels, ConstSpan<double> bounds,
+                                       std::span<const std::string_view> labels, std::span<const double> bounds,
                                        std::string_view helptext, std::string_view unit = "");
 
     /// @copydoc HistogramFamily
     HistogramFamilyPtr HistogramFamily(std::string_view prefix, std::string_view name,
-                                       std::initializer_list<std::string_view> labels, ConstSpan<double> bounds,
+                                       std::initializer_list<std::string_view> labels, std::span<const double> bounds,
                                        std::string_view helptext, std::string_view unit = "");
 
     /**
@@ -200,8 +190,9 @@ public:
      *       different bucket settings. Users may also override
      *       @p bounds via run-time configuration.
      */
-    HistogramPtr HistogramInstance(std::string_view prefix, std::string_view name, Span<const LabelView> labels,
+    HistogramPtr HistogramInstance(std::string_view prefix, std::string_view name, std::span<const LabelView> labels,
-                                   ConstSpan<double> bounds, std::string_view helptext, std::string_view unit = "");
+                                   std::span<const double> bounds, std::string_view helptext,
+                                   std::string_view unit = "");
 
     /// @copdoc HistogramInstance
     HistogramPtr HistogramInstance(std::string_view prefix, std::string_view name,
@@ -229,20 +220,20 @@ public:
 
 protected:
     template<class F>
-    static auto WithLabelNames(Span<const LabelView> xs, F continuation) {
+    static auto WithLabelNames(std::span<const LabelView> xs, F continuation) {
         if ( xs.size() <= 10 ) {
             std::string_view buf[10];
             for ( size_t index = 0; index < xs.size(); ++index )
                 buf[index] = xs[index].first;
 
-            return continuation(Span{buf, xs.size()});
+            return continuation(std::span{buf, xs.size()});
         }
         else {
             std::vector<std::string_view> buf;
             for ( auto x : xs )
                 buf.emplace_back(x.first);
 
-            return continuation(Span{buf});
+            return continuation(std::span{buf});
         }
     }
 

src/telemetry/MetricFamily.h

@@ -2,10 +2,10 @@
 
 #pragma once
 
+#include <span>
 #include <string>
 #include <vector>
 
-#include "zeek/Span.h"
 #include "zeek/util-types.h"
 
 namespace zeek::telemetry {
@@ -25,7 +25,7 @@ public:
     virtual void RunCallbacks() = 0;
 
 protected:
-    MetricFamily(Span<const std::string_view> labels) {
+    MetricFamily(std::span<const std::string_view> labels) {
         for ( const auto& lbl : labels )
             label_names.emplace_back(lbl);
     }

src/telemetry/Utils.cc

@@ -3,6 +3,7 @@
 #include "zeek/telemetry/Utils.h"
 
 #include <algorithm>
+#include <span>
 
 #include "zeek/ID.h"
 #include "zeek/Reporter.h"
@@ -42,7 +43,7 @@ std::string BuildFullPrometheusName(std::string_view prefix, std::string_view na
     return fn;
 }
 
-prometheus::Labels BuildPrometheusLabels(Span<const LabelView> labels) {
+prometheus::Labels BuildPrometheusLabels(std::span<const LabelView> labels) {
     prometheus::Labels p_labels;
 
     static std::string metrics_endpoint_label =

src/telemetry/Utils.h

@@ -4,10 +4,9 @@
 
 #include <prometheus/family.h>
 #include <prometheus/labels.h>
+#include <span>
 #include <string_view>
 
-#include "zeek/Span.h"
-
 namespace zeek::telemetry {
 
 using LabelView = std::pair<std::string_view, std::string_view>;
@@ -18,7 +17,7 @@ namespace detail {
  * Builds a set of labels for prometheus based on a set of labels from
  * Zeek. This adds an 'endpoint' label if it's missing from the set.
  */
-prometheus::Labels BuildPrometheusLabels(Span<const LabelView> labels);
+prometheus::Labels BuildPrometheusLabels(std::span<const LabelView> labels);
 
 /**
  * Builds a full metric name for Prometheus from prefix, name, and unit values.

src/telemetry/telemetry_functions.bif

@@ -4,6 +4,7 @@ module Telemetry;
 
 %%{
 
+#include <span>
 #include "zeek/telemetry/Counter.h"
 #include "zeek/telemetry/Gauge.h"
 #include "zeek/telemetry/Histogram.h"
@@ -64,8 +65,8 @@ std::vector<zeek::telemetry::LabelView> sv_tbl(zeek::TableVal* xs)
 	return result;
 	}
 
-bool labels_valid(zeek::Span<const zeek::telemetry::LabelView> labels,
+bool labels_valid(std::span<const zeek::telemetry::LabelView> labels,
-              zeek::Span<const std::string> label_names)
+              std::span<const std::string> label_names)
 	{
 	auto key_in_label_names = [keys{label_names}](auto x)
 		{

src/util-types.h

@@ -3,10 +3,10 @@
 #pragma once
 
 #include <cstdint>
+#include <span>
 #include <string>
 
 #include "zeek/3rdparty/nonstd/expected.hpp"
-#include "zeek/Span.h"
 
 // These two types are not namespaced intentionally.
 using zeek_int_t = int64_t;
@@ -24,7 +24,7 @@ using unexpected = nonstd::unexpected<E>;
 
 // Byte buffer types used by serialization code in storage and cluster.
 using byte_buffer = std::vector<std::byte>;
-using byte_buffer_span = Span<const std::byte>;
+using byte_buffer_span = std::span<const std::byte>;
 
 namespace util {
 namespace detail {