From 4653a46e8208436baa7fea871c3948b1186bcd2c Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Tue, 22 Aug 2023 19:50:28 +0100
Subject: Add a copying to_lower wrapper

---
 slicer/slicer/hookMap.cpp | 6 ++++++
 slicer/slicer/hookMap.h   | 1 +
 2 files changed, 7 insertions(+)

diff --git a/slicer/slicer/hookMap.cpp b/slicer/slicer/hookMap.cpp
index 3192d6c..c32db2d 100644
--- a/slicer/slicer/hookMap.cpp
+++ b/slicer/slicer/hookMap.cpp
@@ -7,4 +7,10 @@ namespace Slicer {
 	{
 		boost::algorithm::to_lower(s);
 	}
+
+	std::string
+	to_lower_copy(const std::string & s)
+	{
+		return boost::algorithm::to_lower_copy(s);
+	}
 }
diff --git a/slicer/slicer/hookMap.h b/slicer/slicer/hookMap.h
index daef5b0..3328ddd 100644
--- a/slicer/slicer/hookMap.h
+++ b/slicer/slicer/hookMap.h
@@ -11,6 +11,7 @@
 
 namespace Slicer {
 	void DLL_PUBLIC to_lower(std::string & s);
+	[[nodiscard]] std::string DLL_PUBLIC to_lower_copy(const std::string & s);
 
 	template<typename T> class ModelPartForComplex; // IWYU pragma: keep
 
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