Add explicit instantiation

Author: andreiavrammsd

tests/channel_test.cpp

@@ -359,6 +359,15 @@ class MovableOnly {
     int value{0};
 };
 
+template msd::blocking_writer_iterator<msd::channel<int>>& msd::blocking_writer_iterator<msd::channel<int>>::operator=
+    <int>(int&&);
+
+template msd::blocking_writer_iterator<msd::channel<int>>& msd::blocking_writer_iterator<msd::channel<int>>::operator=
+    <const int&>(const int&);
+
+template bool msd::channel<int>::write(int&&);
+template bool msd::channel<int>::write(const int&);
+
 TEST(ChannelTest, Transform)
 {
     const int numbers = 100;
@@ -379,40 +388,8 @@ TEST(ChannelTest, Transform)
 
     // Transform input channel values from MovableOnly to int by multiplying by 2 and write to output channel
     const auto double_transformer = [&input_chan, &output_chan]() {
-        const auto double_value = [](auto&& value) -> int { return value.getValue() * 2; };
-
-#ifdef _MSC_VER
-        for (auto&& value : input_chan) {
-            output_chan.write(double_value(value));
-        }
-
-        // Does not work with std::transform:
-        //
-        // could be 'void std::queue<T,std::deque<T,std::allocator<int>>>::push(int &&)'
-        //   with
-        //   [
-        //       T=ChannelTest_Traits_Test::TestBody::type
-        //   ]
-        //   D:\a\cpp-channel\cpp-channel\include\msd\channel.hpp(105,20):
-        //   'void std::queue<T,std::deque<T,std::allocator<int>>>::push(int &&)': cannot convert argument 1 from
-        //   '_OutIt' to 'int &&' with
-        //   [
-        //       T=ChannelTest_Traits_Test::TestBody::type
-        //   ]
-        //   and
-        //   [
-        //       _OutIt=msd::blocking_writer_iterator<msd::channel<ChannelTest_Traits_Test::TestBody::type>>
-        //   ]
-        //       D:\a\cpp-channel\cpp-channel\include\msd\channel.hpp(105,43):
-        //       Reason: cannot convert from '_OutIt' to 'int'
-        //   with
-        //   [
-        //       _OutIt=msd::blocking_writer_iterator<msd::channel<ChannelTest_Traits_Test::TestBody::type>>
-        //   ]
-#else
-        std::transform(input_chan.begin(), input_chan.end(), msd::back_inserter(output_chan), double_value);
-#endif  // _MSC_VER
-
+        std::transform(input_chan.begin(), input_chan.end(), msd::back_inserter(output_chan),
+                       [](auto&& value) -> int { return value.getValue() * 2; });
         output_chan.close();
     };