[Bf-blender-cvs] [9c2715ffda9] master: BLI: add Map.is_empty() method

[Jacques Lucke]

Commit: 9c2715ffda93a7625955a453a6dacaa4b601dd89
Author: Jacques Lucke
Date:   Tue Apr 28 11:44:10 2020 +0200
Branches: master
https://developer.blender.org/rB9c2715ffda93a7625955a453a6dacaa4b601dd89

BLI: add Map.is_empty() method

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

M	source/blender/blenlib/BLI_map.hh
M	tests/gtests/blenlib/BLI_map_test.cc

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

diff --git a/source/blender/blenlib/BLI_map.hh b/source/blender/blenlib/BLI_map.hh
index 553175b0395..eb9c6372995 100644
--- a/source/blender/blenlib/BLI_map.hh
+++ b/source/blender/blenlib/BLI_map.hh
@@ -415,6 +415,14 @@ class Map {
     return m_array.slots_set();
   }
 
+  /**
+   * Returns true if there are no elements in the map.
+   */
+  bool is_empty() const
+  {
+    return this->size() == 0;
+  }
+
   /**
    * Calls the given function for each key-value-pair.
    */
diff --git a/tests/gtests/blenlib/BLI_map_test.cc b/tests/gtests/blenlib/BLI_map_test.cc
index 2d052635c88..e9e4b1895ab 100644
--- a/tests/gtests/blenlib/BLI_map_test.cc
+++ b/tests/gtests/blenlib/BLI_map_test.cc
@@ -9,16 +9,20 @@ TEST(map, DefaultConstructor)
 {
   IntFloatMap map;
   EXPECT_EQ(map.size(), 0);
+  EXPECT_TRUE(map.is_empty());
 }
 
 TEST(map, AddIncreasesSize)
 {
   IntFloatMap map;
   EXPECT_EQ(map.size(), 0);
+  EXPECT_TRUE(map.is_empty());
   map.add(2, 5.0f);
   EXPECT_EQ(map.size(), 1);
+  EXPECT_FALSE(map.is_empty());
   map.add(6, 2.0f);
   EXPECT_EQ(map.size(), 2);
+  EXPECT_FALSE(map.is_empty());
 }
 
 TEST(map, Contains)