Add SelectedFrames::size/empty() member functions

src/doc/selected_frames.cpp

@@ -12,6 +12,14 @@
 
 namespace doc {
 
+std::size_t SelectedFrames::size() const
+{
+  std::size_t size = 0;
+  for (auto& range : m_ranges)
+    size += (range.toFrame - range.fromFrame + 1);
+  return size;
+}
+
 void SelectedFrames::insert(frame_t frame)
 {
   if (m_ranges.empty()) {

src/doc/selected_frames.h

@@ -61,6 +61,9 @@ namespace doc {
     const_iterator begin() const { return const_iterator(m_ranges.begin()); }
     const_iterator end() const { return const_iterator(m_ranges.end()); }
 
+    std::size_t size() const;
+    bool empty() const { return m_ranges.empty(); }
+
     void insert(frame_t frame);
     void insert(frame_t fromFrame, frame_t toFrame);
 

src/doc/selected_frames_tests.cpp

@@ -20,9 +20,12 @@ using namespace doc;
 TEST(SelectedFrames, BasicOneRange)
 {
   SelectedFrames f;
+  ASSERT_TRUE(f.empty());
   f.insert(1);
   f.insert(2);
   f.insert(3);
+  ASSERT_FALSE(f.empty());
+  ASSERT_EQ(3, f.size());
 
   std::vector<frame_t> res;
   std::copy(f.begin(), f.end(), std::back_inserter(res));
@@ -39,6 +42,7 @@ TEST(SelectedFrames, BasicThreeRanges)
   f.insert(1);
   f.insert(3);
   f.insert(5);
+  ASSERT_EQ(3, f.size());
 
   std::vector<frame_t> res;
   std::copy(f.begin(), f.end(), std::back_inserter(res));
@@ -55,6 +59,7 @@ TEST(SelectedFrames, InsertSelectedFrameInsideSelectedRange)
   f.insert(3);
   f.insert(5, 8);
   f.insert(7);
+  ASSERT_EQ(5, f.size());
 
   std::vector<frame_t> res;
   std::copy(f.begin(), f.end(), std::back_inserter(res));