From f36a14973a259c9dd4e3a7f748b2779f2412a577 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Fri, 11 Aug 2017 14:39:46 +1000
Subject: [PATCH] region: add `encloses' test for subregions

---
 region.cpp | 9 +++++++++
 region.hpp | 3 +++
 2 files changed, 12 insertions(+)

diff --git a/region.cpp b/region.cpp
index a39d49d9..164ddf14 100644
--- a/region.cpp
+++ b/region.cpp
@@ -252,6 +252,15 @@ util::region<S,T>::intersection (region<S,T> rhs) const
 
 //-----------------------------------------------------------------------------
 template <size_t S, typename T>
+bool
+util::region<S,T>::encloses (const region<S,T> r) const noexcept
+{
+    return all (p <= r.p) && all (p + e >= r.p + r.e);
+}
+
+
+///////////////////////////////////////////////////////////////////////////////
+template <size_t S, typename T>
 util::region<S,T>
 util::region<S,T>::inset (T mag) const
 {
diff --git a/region.hpp b/region.hpp
index 379eefcc..e052bc4b 100644
--- a/region.hpp
+++ b/region.hpp
@@ -83,6 +83,9 @@ namespace util {
         // Compute binary region combinations
         region intersection (region<S,T>) const;
 
+        // Test if a region lies completely within our space
+        bool encloses (region<S,T>) const noexcept;
+
         //---------------------------------------------------------------------
         // Compute a region `mag` units into the region
         region inset (T mag) const;