Code refactoring (#74)

* Don't reset model state and feature extractor on endpointing

* support passing decoding_method from commandline

* Add modified_beam_search to Python API

* fix C API example

* Fix style issues

sherpa-onnx/csrc/online-transducer-decoder.cc

@@ -0,0 +1,60 @@
+// sherpa-onnx/csrc/online-transducer-decoder.cc
+//
+// Copyright (c)  2023  Xiaomi Corporation
+
+#include "sherpa-onnx/csrc/online-transducer-decoder.h"
+
+#include <utility>
+#include <vector>
+
+#include "onnxruntime_cxx_api.h"  // NOLINT
+#include "sherpa-onnx/csrc/onnx-utils.h"
+
+namespace sherpa_onnx {
+
+OnlineTransducerDecoderResult::OnlineTransducerDecoderResult(
+    const OnlineTransducerDecoderResult &other)
+    : OnlineTransducerDecoderResult() {
+  *this = other;
+}
+
+OnlineTransducerDecoderResult &OnlineTransducerDecoderResult::operator=(
+    const OnlineTransducerDecoderResult &other) {
+  if (this == &other) {
+    return *this;
+  }
+
+  tokens = other.tokens;
+  num_trailing_blanks = other.num_trailing_blanks;
+
+  Ort::AllocatorWithDefaultOptions allocator;
+  if (other.decoder_out) {
+    decoder_out = Clone(allocator, &other.decoder_out);
+  }
+
+  hyps = other.hyps;
+
+  return *this;
+}
+
+OnlineTransducerDecoderResult::OnlineTransducerDecoderResult(
+    OnlineTransducerDecoderResult &&other)
+    : OnlineTransducerDecoderResult() {
+  *this = std::move(other);
+}
+
+OnlineTransducerDecoderResult &OnlineTransducerDecoderResult::operator=(
+    OnlineTransducerDecoderResult &&other) {
+  if (this == &other) {
+    return *this;
+  }
+
+  tokens = std::move(other.tokens);
+  num_trailing_blanks = other.num_trailing_blanks;
+  decoder_out = std::move(other.decoder_out);
+  hyps = std::move(other.hyps);
+
+  return *this;
+}
+
+}  // namespace sherpa_onnx