Blocks and flowgraph: added this time

oxydsp-flowgraph/src/block.rs

@@ -0,0 +1,28 @@
+use crate::edge::BlockIOIndex;
+
+pub enum BlockResult
+{
+    Ok,
+    Terminated,
+}
+
+pub trait BlockIO
+{
+    // Get all of the BlockIOIndices (block index + port) that
+    // this blocks can send data to.
+    fn get_successors(&self) -> Vec<BlockIOIndex>;
+
+    // Sets the index of the current blocks on the shared edges
+    fn set_index(&self, block_index: usize);
+
+    // Number of input/output ports
+    fn input_count(&self);
+    fn output_count(&self);
+}
+
+pub trait Block
+{
+    fn work(&mut self) -> BlockResult;
+}
+
+pub trait GraphableBlock: Block + BlockIO {}