Added vsg::getFeatures(..) function to make it more convinient to che…

…ck all the ReaderWriter features available via the vsg::Options::readerWriters list.

include/vsg/io/ReaderWriter.h

@@ -128,4 +128,7 @@ namespace vsg
     };
     VSG_type_name(vsg::CompositeReaderWriter);
 
+    /// Get the Features supported by the ReaderWriters assigned to Options object.
+    extern VSG_DECLSPEC bool getFeatures(ref_ptr<const Options> options, ReaderWriter::Features& features);
+
 } // namespace vsg

src/vsg/io/ReaderWriter.cpp

@@ -104,3 +104,15 @@ bool CompositeReaderWriter::getFeatures(Features& features) const
     }
     return result;
 }
+
+bool vsg::getFeatures(ref_ptr<const Options> options, ReaderWriter::Features& features)
+{
+    if (!options) return false;
+
+    bool result = false;
+    for (auto& rw : options->readerWriters)
+    {
+        if (rw->getFeatures(features)) result = true;
+    }
+    return result;
+}