From 6b113c827063972d43bf55d25b6baa66374992ac Mon Sep 17 00:00:00 2001
From: Joseph Henry <joseph.henry@zerotier.com>
Date: Wed, 26 Feb 2025 09:55:08 -0800
Subject: [PATCH] Add auto-detection of platform integer size in prometheus

---
 .../core/include/prometheus/counter.h             | 13 ++++++++++++-
 .../core/include/prometheus/gauge.h               | 10 ++++++++++
 .../simpleapi/include/prometheus/simpleapi.h      | 15 +++++++++++++--
 3 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/ext/prometheus-cpp-lite-1.0/core/include/prometheus/counter.h b/ext/prometheus-cpp-lite-1.0/core/include/prometheus/counter.h
index 5d8053739..bd309c43a 100644
--- a/ext/prometheus-cpp-lite-1.0/core/include/prometheus/counter.h
+++ b/ext/prometheus-cpp-lite-1.0/core/include/prometheus/counter.h
@@ -25,7 +25,18 @@ namespace prometheus {
   ///
   /// The class is thread-safe. No concurrent call to any API of this type causes
   /// a data race.
-  template <typename Value_ = uint64_t>
+
+#include <stdint.h>
+
+#if UINTPTR_MAX == 0xffFFffFF
+// 32-bit platform
+template <typename Value_ = uint32_t>
+#elif UINTPTR_MAX == 0xffFFffFFffFFffFF
+// 64-bit platform
+template <typename Value_ = uint64_t>
+#else
+#error Unknown platform - does not look either like 32-bit or 64-bit
+#endif
   class Counter : public Metric {
 
     std::atomic<Value_> value{ 0 };
diff --git a/ext/prometheus-cpp-lite-1.0/core/include/prometheus/gauge.h b/ext/prometheus-cpp-lite-1.0/core/include/prometheus/gauge.h
index fcda14631..2e4a4db8b 100644
--- a/ext/prometheus-cpp-lite-1.0/core/include/prometheus/gauge.h
+++ b/ext/prometheus-cpp-lite-1.0/core/include/prometheus/gauge.h
@@ -23,7 +23,17 @@ namespace prometheus {
   ///
   /// The class is thread-safe. No concurrent call to any API of this type causes
   /// a data race.
+  #include <stdint.h>
+
+  #if UINTPTR_MAX == 0xffFFffFF
+  // 32-bit
+  template <typename Value_ = uint32_t>
+  #elif UINTPTR_MAX == 0xffFFffFFffFFffFF
+  // 64-bit
   template <typename Value_ = uint64_t>
+  #else
+  #error Unknown platform - does not look either like 32-bit or 64-bit
+  #endif
   class Gauge : public Metric {
 
     std::atomic<Value_> value { 0 };
diff --git a/ext/prometheus-cpp-lite-1.0/simpleapi/include/prometheus/simpleapi.h b/ext/prometheus-cpp-lite-1.0/simpleapi/include/prometheus/simpleapi.h
index bf2ec4832..12e115844 100644
--- a/ext/prometheus-cpp-lite-1.0/simpleapi/include/prometheus/simpleapi.h
+++ b/ext/prometheus-cpp-lite-1.0/simpleapi/include/prometheus/simpleapi.h
@@ -15,6 +15,17 @@
 #include <memory>
 #include <functional>
 #include <stdexcept>
+#include <stdint.h>
+
+#if UINTPTR_MAX == 0xffFFffFF
+// 32-bit
+typedef uint32_tmetric_size;
+#elif UINTPTR_MAX == 0xffFFffFFffFFffFF
+// 64-bit
+typedef uint64_t metric_size;
+#else
+#error Unknown platform - does not look either like 32-bit or 64-bit
+#endif
 
 namespace prometheus {
   namespace simpleapi {
@@ -46,7 +57,7 @@ namespace prometheus {
 
     public:
 
-      using Metric = Counter<uint64_t>;
+      using Metric = Counter<metric_size>;
       using Family = Metric::Family;
 
     private:
@@ -82,7 +93,7 @@ namespace prometheus {
 
     public:
 
-      using Metric = Gauge<int64_t>;
+      using Metric = Gauge<metric_size>;
       using Family = Metric::Family;
 
     private: