From 7a21da90fdd8ae92ba2a0fff5443c39253a5a5a6 Mon Sep 17 00:00:00 2001
From: Olly Betts <olly@survex.com>
Date: Thu, 3 Feb 2022 22:50:28 +1300
Subject: [PATCH] [C#] Fix memory leak in directorin typemap for std::string.

Fixes #998
---
 CHANGES.current         | 4 ++++
 Lib/csharp/std_string.i | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/CHANGES.current b/CHANGES.current
index aa1816ae8..9ec78b631 100644
--- a/CHANGES.current
+++ b/CHANGES.current
@@ -7,6 +7,10 @@ the issue number to the end of the URL: https://github.com/swig/swig/issues/
 Version 4.1.0 (in progress)
 ===========================
 
+2022-02-03: olly
+	    [C#] #283 #998 Fix memory leak in directorin typemap for
+	    std::string.
+
 2022-02-03: olly
 	    [Python] #967 Make `self` parameter available to user typemaps.
 
diff --git a/Lib/csharp/std_string.i b/Lib/csharp/std_string.i
index 5f8fa44cb..79b71c4c5 100644
--- a/Lib/csharp/std_string.i
+++ b/Lib/csharp/std_string.i
@@ -20,7 +20,7 @@ namespace std {
 class string;
 
 // string
-%typemap(ctype) string "char *"
+%typemap(ctype) string "const char *"
 %typemap(imtype) string "string"
 %typemap(cstype) string "string"
 
@@ -42,7 +42,7 @@ class string;
    }
    $result.assign($input); %}
 
-%typemap(directorin) string %{ $input = SWIG_csharp_string_callback($1.c_str()); %}
+%typemap(directorin) string %{ $input = $1.c_str(); %}
 
 %typemap(csin) string "$csinput"
 %typemap(csout, excode=SWIGEXCODE) string {