From b0c5636d1940910721e8fe743e618bef98611db6 Mon Sep 17 00:00:00 2001
From: Steve Rough <steve.rough@reactivemarkets.com>
Date: Wed, 10 Sep 2025 11:03:08 +0000
Subject: [PATCH] feat: Add for_each_section to MultiConfig

SDB-9727
---
 toolbox/util/Config.hpp    | 19 +++++++++++++++++--
 toolbox/util/Config.ut.cpp | 30 ++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 2 deletions(-)

diff --git a/toolbox/util/Config.hpp b/toolbox/util/Config.hpp
index 1734ec221..ac0c2c947 100644
--- a/toolbox/util/Config.hpp
+++ b/toolbox/util/Config.hpp
@@ -21,10 +21,12 @@
 #include <toolbox/util/Utility.hpp>
 #include <toolbox/util/String.hpp>
 
+#include <algorithm>
+#include <map>
 #include <ranges>
 #include <stdexcept>
 #include <unordered_map>
-#include <map>
+#include <utility>
 
 namespace toolbox {
 inline namespace util {
@@ -246,10 +248,23 @@ class TOOLBOX_API MultiConfig {
         return section(std::string{name});
     }
 
+    template <typename F>
+    void for_each_section(F f) const
+    noexcept(noexcept(
+        f(std::declval<const MultiConfig::MapType::key_type&>(),
+          std::declval<const MultiConfig::MapType::mapped_type&>())
+    ))
+    {
+       std::for_each(map_.begin(), map_.end(), [&f](const auto& kv) {
+           f(kv.first, kv.second);
+       });
+    }
+
   private:
     Config root_;
     // Map of named sections.
-    std::map<std::string, Config> map_;
+    using MapType = std::map<std::string, Config>;
+    MapType map_;
 };
 
 } // namespace util
diff --git a/toolbox/util/Config.ut.cpp b/toolbox/util/Config.ut.cpp
index 494a7439b..48014b496 100644
--- a/toolbox/util/Config.ut.cpp
+++ b/toolbox/util/Config.ut.cpp
@@ -458,4 +458,34 @@ foo=101
     BOOST_CHECK_EQUAL(foo_it == foo_rng.end(), true);
 }
 
+BOOST_AUTO_TEST_CASE(MultiConfig_for_each_section)
+{
+    const string text{R"(
+[First]
+key_abc=value_abc
+
+[Second]
+key_xyz=value_xyz
+)"};
+
+	std::map<std::string,util::Config> sections;
+
+	MultiConfig c;
+	istringstream is{text};
+	c.read(is);
+	c.for_each_section([&sections](const std::string& name, const util::Config& config) {
+		sections.emplace(name, config);
+	});
+	auto first{sections.find("First")};
+	auto second{sections.find("Second")};
+    if (first == sections.end()) {
+		BOOST_FAIL("Missing section 'First'");
+	}
+    if (second == sections.end()) {
+		BOOST_FAIL("Missing section 'Second'");
+	}
+	BOOST_CHECK_EQUAL(first->second.get<std::string_view>("key_abc"), "value_abc"sv);
+	BOOST_CHECK_EQUAL(second->second.get<std::string_view>("key_xyz"), "value_xyz"sv);
+}
+
 BOOST_AUTO_TEST_SUITE_END()