Merge pull request #49 from forderud/ref-const-sample

WinrtServer: Extend sample with "ref" & "ref const" samples

TutorialsAndTests/Tests/WinrtServerTests.cpp

@@ -64,4 +64,19 @@ TEST(WinrtServerTests, RequireThat_Buffer_ReturnsCorrectValues)
 
     EXPECT_EQ(buffer.size(), 8u);
     EXPECT_EQ(buffer[0], 1);
-}
+}
+
+TEST(WinrtServerTests, RequireThat_Buffer_CanBeSetAndFilled)
+{
+    init_apartment(winrt::apartment_type::single_threaded);
+
+    winrt::WinrtServer::Programmer programmer; // will trigger WinrtServer.dll loading
+
+    std::vector<uint8_t> content = { 8, 7, 6, 5, 4, 3, 2, 1 };
+    programmer.SetBuffer(content);
+
+    std::vector<uint8_t> copy(8, 0);
+    programmer.FillBuffer(copy);
+
+    EXPECT_EQ(content, copy);
+}

WinrtServer/Programmer.cpp

@@ -45,4 +45,16 @@ namespace winrt::WinrtServer::implementation
         // return a copy
         return com_array<uint8_t>{ m_buffer.begin(), m_buffer.end() };
     }
+
+    void Programmer::SetBuffer(const array_view<uint8_t> buffer) {
+        m_buffer.resize(buffer.size());
+
+        for (unsigned int i = 0; i < buffer.size(); ++i)
+            m_buffer[i] = buffer[i];
+    }
+
+    void Programmer::FillBuffer(array_view<uint8_t> buffer) {
+        for (unsigned int i = 0; (i < buffer.size()) && (i < m_buffer.size()); ++i)
+            buffer[i] = m_buffer[i];
+    }
 }

WinrtServer/Programmer.h

@@ -15,6 +15,10 @@ namespace winrt::WinrtServer::implementation
         Favorites GetFavorites();
         com_array<uint8_t> Buffer();
 
+        void SetBuffer(const array_view<uint8_t> buffer);
+
+        void FillBuffer(array_view<uint8_t> buffer);
+
     private:
         int m_motivation = 0;
         std::vector<uint8_t> m_buffer;

WinrtServer/Programmer.idl

@@ -23,6 +23,12 @@ namespace WinrtServer
         Pos3 Add(Pos3 a, Pos3 b);
 
         UInt8[] Buffer{ get; };
+
+        // set read-only buffer (no copying of argument)
+        void SetBuffer(ref const UInt8[] buffer);
+
+        // fill caller-provided buffer with values (no copying of argument)
+        void FillBuffer(ref UInt8[] buffer);
     }
 
     runtimeclass Programmer : [default] IProgrammer