[Bf-blender-cvs] [d575b72c16d] master: BLI: add Set.is_empty method

[Jacques Lucke]

Commit: d575b72c16d217353795594032196a5857907de2
Author: Jacques Lucke
Date:   Tue Apr 28 16:35:49 2020 +0200
Branches: master
https://developer.blender.org/rBd575b72c16d217353795594032196a5857907de2

BLI: add Set.is_empty method

===================================================================

M	source/blender/blenlib/BLI_set.hh
M	tests/gtests/blenlib/BLI_set_test.cc

===================================================================

diff --git a/source/blender/blenlib/BLI_set.hh b/source/blender/blenlib/BLI_set.hh
index b09dd910007..f9d4bbfaed4 100644
--- a/source/blender/blenlib/BLI_set.hh
+++ b/source/blender/blenlib/BLI_set.hh
@@ -276,6 +276,14 @@ class Set {
     return m_array.slots_set();
   }
 
+  /**
+   * Return true if this set contains no elements.
+   */
+  bool is_empty() const
+  {
+    return this->size() == 0;
+  }
+
   /**
    * Returns true when there is at least one element that is in both sets.
    * Otherwise false.
diff --git a/tests/gtests/blenlib/BLI_set_test.cc b/tests/gtests/blenlib/BLI_set_test.cc
index dc163e752d8..ae46c2bf52e 100644
--- a/tests/gtests/blenlib/BLI_set_test.cc
+++ b/tests/gtests/blenlib/BLI_set_test.cc
@@ -10,6 +10,7 @@ TEST(set, Defaultconstructor)
 {
   IntSet set;
   EXPECT_EQ(set.size(), 0);
+  EXPECT_TRUE(set.is_empty());
 }
 
 TEST(set, ContainsNotExistant)
@@ -22,8 +23,10 @@ TEST(set, ContainsExistant)
 {
   IntSet set;
   EXPECT_FALSE(set.contains(5));
+  EXPECT_TRUE(set.is_empty());
   set.add(5);
   EXPECT_TRUE(set.contains(5));
+  EXPECT_FALSE(set.is_empty());
 }
 
 TEST(set, AddMany)