add getCurrentSpan convenience function

Author: duncanpo

api/trace/+opentelemetry/+trace/getCurrentSpan.m

@@ -0,0 +1,14 @@
+function sp = getCurrentSpan()
+% Retrieve the current span
+%    SP = OPENTELEMETRY.TRACE.GETCURRENTSPAN() returns the current span.
+%    If there is not current span, SP will be an invalid span with all-zero
+%    trace and span IDs.
+%
+%    See also OPENTELEMETRY.TRACE.SPAN,
+%    OPENTELEMETRY.CONTEXT.GETCURRENTCONTEXT
+%    OPENTELEMETRY.TRACE.CONTEXT.EXTRACTSPAN
+
+% Copyright 2024 The MathWorks, Inc.
+
+ctx = opentelemetry.context.getCurrentContext;
+sp = opentelemetry.trace.Context.extractSpan(ctx);

test/autotrace_examples/manual_instrumented_example/manual_instrumented_example.m

@@ -5,8 +5,7 @@
 % Copyright 2024 The MathWorks, Inc.
 
 % add an attribute about input
-ctx = opentelemetry.context.getCurrentContext;
-sp = opentelemetry.trace.Context.extractSpan(ctx);
+sp = opentelemetry.trace.getCurrentSpan;
 setAttributes(sp, "DataSize", n);
 
 [x, y] = generate_data(n);