dev-util/bdelta: tweak for gcc-6, bug #594246

c++11 intruduced next() helper
    http://en.cppreference.com/w/cpp/iterator/next
which does exactly the same.

Reported-by: Toralf Förster
Bug: https://bugs.gentoo.org/594246

Package-Manager: portage-2.3.0

dev-util/bdelta/bdelta-0.3.1.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2013 Gentoo Foundation
+# Copyright 1999-2016 Gentoo Foundation
 # Distributed under the terms of the GNU General Public License v2
 # $Id$
 
@@ -28,6 +28,7 @@ IUSE=""
 
 src_prepare() {
 	epatch "${FILESDIR}"/${P}-soname.patch
+	epatch "${FILESDIR}"/${P}-gcc-6.patch
 }
 
 src_compile() {

dev-util/bdelta/files/bdelta-0.3.1-gcc-6.patch

@@ -0,0 +1,18 @@
+diff --git a/src/libbdelta.cpp b/src/libbdelta.cpp
+index b11bb2b..d769b0d 100644
+--- a/src/libbdelta.cpp
++++ b/src/libbdelta.cpp
+@@ -117,7 +117,3 @@ unsigned match_backward(BDelta_Instance *b, unsigned p1, unsigned p2, unsigned b
+ // Iterator helper function
+-template <class T>
+-inline T prior(T i) {return --i;}
+-template <class T>
+-inline T next(T i) {return ++i;}
+-
++template <class T> inline T bdelta_next(T i) {return ++i;}
+
+@@ -423,3 +419,3 @@ void bdelta_pass(BDelta_Instance *b, unsigned blocksize, unsigned minMatchSize,
+ 				if (! maxHoleSize || (u1.num <= maxHoleSize && u2.num <= maxHoleSize))
+-					if (! (flags & BDELTA_SIDES_ORDERED) || (next(u1.ml) == u1.mr && next(u2.ml) == u2.mr))
++					if (! (flags & BDELTA_SIDES_ORDERED) || (bdelta_next(u1.ml) == u1.mr && bdelta_next(u2.ml) == u2.mr))
+ 						bdelta_pass_2(b, blocksize, minMatchSize, &u1, 1, &u2, 1);