From ac5a99da31109e6410264524cb842722bedf13d3 Mon Sep 17 00:00:00 2001
From: Christian Mazakas <christian.mazakas@gmail.com>
Date: Thu, 15 Jun 2023 09:17:25 -0700
Subject: [PATCH] Add max_size() impl

---
 include/boost/unordered/concurrent_flat_map.hpp | 1 +
 test/cfoa/fwd_tests.cpp                         | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/include/boost/unordered/concurrent_flat_map.hpp b/include/boost/unordered/concurrent_flat_map.hpp
index aa699844..a47eee81 100644
--- a/include/boost/unordered/concurrent_flat_map.hpp
+++ b/include/boost/unordered/concurrent_flat_map.hpp
@@ -246,6 +246,7 @@ namespace boost {
       ///
 
       size_type size() const noexcept { return table_.size(); }
+      size_type max_size() const noexcept { return table_.max_size(); }
 
       BOOST_ATTRIBUTE_NODISCARD bool empty() const noexcept
       {
diff --git a/test/cfoa/fwd_tests.cpp b/test/cfoa/fwd_tests.cpp
index 80cd4a0c..dced611e 100644
--- a/test/cfoa/fwd_tests.cpp
+++ b/test/cfoa/fwd_tests.cpp
@@ -5,6 +5,7 @@
 #include "helpers.hpp"
 #include <boost/config/workaround.hpp>
 #include <boost/unordered/concurrent_flat_map_fwd.hpp>
+#include <limits>
 
 test::seed_t initialize_seed{32304628};
 
@@ -58,4 +59,12 @@ UNORDERED_AUTO_TEST (fwd_unequal_call) {
   BOOST_TEST_NOT(unequal_call(x1, x2));
 }
 
+// this isn't the best place for this test but it's better than introducing a
+// new file
+UNORDERED_AUTO_TEST (max_size) {
+  map_type x1;
+  BOOST_TEST_EQ(
+    x1.max_size(), std::numeric_limits<typename map_type::size_type>::max());
+}
+
 RUN_TESTS()