chore: add namespace compatibility macro for Roaring64Map (libroaring vcpkg/apt)

Author: syslucas

LegacyFindPackages.cmake

@@ -127,6 +127,14 @@ message("ROARING_LIBRARIES: " ${ROARING_LIBRARIES})
 if (NOT ROARING_INCLUDE_DIRS OR NOT ROARING_LIBRARIES)
     message(FATAL_ERROR "Could not find libroaring")
 endif ()
+file(READ "${ROARING_INCLUDE_DIRS}/roaring/roaring.hh" ROARING_HEADER_CONTENTS)
+string(REGEX MATCH "namespace roaring" ROARING_HAS_NAMESPACE "${ROARING_HEADER_CONTENTS}")
+if (ROARING_HAS_NAMESPACE)
+    message(STATUS "Roaring64Map is in namespace roaring")
+else ()
+    message(STATUS "Roaring64Map is in global namespace")
+    add_definitions(-DROARING_NAMESPACE_GLOBAL)
+endif ()
 
 if (LINK_STATIC AND NOT VCPKG_TRIPLET)
     find_library(LIB_ZSTD NAMES libzstd.a)

lib/NegativeAcksTracker.h

@@ -42,7 +42,7 @@ using ClientImplPtr = std::shared_ptr<ClientImpl>;
 class ExecutorService;
 using ExecutorServicePtr = std::shared_ptr<ExecutorService>;
 using LedgerId = int64_t;
-#if __cplusplus >= 202002L
+#ifdef ROARING_NAMESPACE_GLOBAL
 using ConditionalRoaringMap = Roaring64Map;
 #else
 using ConditionalRoaringMap = roaring::Roaring64Map;