From b44f936f95f14af96fcec08e48df26ab24c481ed Mon Sep 17 00:00:00 2001
From: ser1zw <azariahsawtikes@gmail.com>
Date: Sun, 5 Feb 2012 19:08:46 +0900
Subject: [PATCH] fix a memory leak of GUI::Trackbar

---
 ext/opencv/trackbar.cpp | 10 ++++++++--
 ext/opencv/trackbar.h   |  1 +
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/ext/opencv/trackbar.cpp b/ext/opencv/trackbar.cpp
index 0e15958..183cd3c 100644
--- a/ext/opencv/trackbar.cpp
+++ b/ext/opencv/trackbar.cpp
@@ -30,7 +30,7 @@ void define_ruby_class() {
     return;
   /* 
    * opencv = rb_define_module("OpenCV");
-   * GUI = rb_define_module_under(opencv, "GUI");         
+   * GUI = rb_define_module_under(opencv, "GUI");
    *
    * note: this comment is used by rdoc.
    */
@@ -46,13 +46,19 @@ void define_ruby_class() {
 
 VALUE rb_allocate(VALUE klass) {
   Trackbar *ptr;
-  return Data_Make_Struct(klass, Trackbar, trackbar_mark, 0, ptr);
+  return Data_Make_Struct(klass, Trackbar, trackbar_mark, trackbar_free, ptr);
 }
 
 void trackbar_mark(void *ptr) {
   rb_gc_mark(((Trackbar*)ptr)->block);
 }
 
+void trackbar_free(void *ptr) {
+  Trackbar *trackbar = (Trackbar*)ptr;
+  free(trackbar->name);
+  free(trackbar);
+}
+
 /*
  * call-seq:
  *   new(<i>name,maxval[,val],&block</i>)
diff --git a/ext/opencv/trackbar.h b/ext/opencv/trackbar.h
index 7205fea..ca08176 100644
--- a/ext/opencv/trackbar.h
+++ b/ext/opencv/trackbar.h
@@ -37,6 +37,7 @@ void define_ruby_class();
 VALUE rb_allocate(VALUE klass);
 
 void trackbar_mark(void *ptr);
+void trackbar_free(void *ptr);
 
 VALUE rb_initialize(int argc, VALUE *argv, VALUE self);
 VALUE rb_name(VALUE self);