From: fred <fred>
Date: Wed, 9 Oct 1996 11:42:13 +0000 (+0000)
Subject: flower-1.0.1
X-Git-Tag: release/1.5.59~7133
X-Git-Url: https://git.donarmstrong.com/?a=commitdiff_plain;h=2f45b682ff7ba4f338c10d05e7ec8daf78118446;p=lilypond.git

flower-1.0.1
---

diff --git a/flower/Makefile b/flower/Makefile
index 39e1cd7812..5fb4f2a5b6 100644
--- a/flower/Makefile
+++ b/flower/Makefile
@@ -1,5 +1,9 @@
+MAJVER=1
+MINVER=0
+PATCHLEVEL=1
+
 PACKAGENAME=flower
-VERSION=1.0
+VERSION=$(MAJVER).$(MINVER).$(PATCHLEVEL)
 DNAME=$(PACKAGENAME)-$(VERSION)
 CXXFLAGS+=-g -Wall
 
@@ -9,7 +13,7 @@ templatecc=cursor.cc list.cc
 inl=findcurs.inl link.inl list.inl
 hh=cursor.hh cursor.inl lgetopt.hh link.hh list.hh \
 	string.hh stringutil.hh vray.hh textdb.hh textstr.hh  assoc.hh\
-	findcurs.hh unionfind.hh compare.hh
+	findcurs.hh unionfind.hh compare.hh handle.hh
 
 
 
diff --git a/flower/handle.hh b/flower/handle.hh
new file mode 100644
index 0000000000..32573998f2
--- /dev/null
+++ b/flower/handle.hh
@@ -0,0 +1,57 @@
+#ifndef HANDLE_HH
+#define HANDLE_HH
+/// reference counting handle
+template<class T>
+class Handle {
+    T *obj;
+    int *refs;
+
+    /// let go of ref. Delete if necessary
+    void down() {
+	if (!(*refs--)) {
+	    delete obj;
+	    delete refs;
+	}
+	obj = 0;
+	refs = 0;
+    }
+    /// point to new object. 
+    void up(T *t, int *r=0) {
+	if (!r) {
+	    refs = new int;
+	    *refs = 1;
+	} else {
+	    refs =r;
+	    *refs++;
+	}
+	obj = t;
+    }
+    /// POST: *refs == 1
+    void copy() {
+	if(*refs != 1){
+	    T * newobj = new T(*obj );
+	    down();
+	    up(newobj);
+	}
+    }
+    Handle(Handle const &src) {
+	up(src.obj, src.refs);
+    }
+    Handle(T & o) {
+	up (&o);
+    }
+    void operator=(Handle const& src) {
+	if (this == &src)
+	    return;
+	down();
+	up(src.o, src.refs);
+    }
+    operator const T&() {
+	return *obj;
+    }
+    operator T&() {
+	copy();
+	return *obj;
+    }
+}
+#endif