Merge pull request #15 from theodelrieu/feat/lazy

feat: add lazy_encode/lazy_decode functions to basic_codec
theodelrieu · Sep 16, 2021 · 90a742f · 90a742f
2 parents 68235d2 + ce6ea52
commit 90a742f
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Showing 2 changed files with 44 additions and 4 deletions.
diff --git a/codecs/include/mgs/codecs/basic_codec.hpp b/codecs/include/mgs/codecs/basic_codec.hpp
@@ -138,6 +138,34 @@ class basic_codec
  {
  return output_traits<T>::create(make_decoder(std::forward<Args>(args)...));
  }
+
+ template <typename T = default_encoded_output>
+ static auto lazy_encode()
+ {
+ return
+ [](auto&&... args)
+ -> codecs::codec_output<
+ decltype(output_traits<T>::create(
+ make_encoder(std::forward<decltype(args)>(args)...))),
+ decltype(make_encoder(std::forward<decltype(args)>(args)...))> {
+ return output_traits<T>::create(
+ make_encoder(std::forward<decltype(args)>(args)...));
+ };
+ }
+
+ template <typename T = default_decoded_output>
+ static auto lazy_decode()
+ {
+ return
+ [](auto&&... args)
+ -> codecs::codec_output<
+ decltype(output_traits<T>::create(
+ make_decoder(std::forward<decltype(args)>(args)...))),
+ decltype(make_decoder(std::forward<decltype(args)>(args)...))> {
+ return output_traits<T>::create(
+ make_decoder(std::forward<decltype(args)>(args)...));
+ };
+ }
 };
 }
 }
diff --git a/codecs/test/codec_helpers.hpp b/codecs/test/codec_helpers.hpp
@@ -57,7 +57,10 @@ template <typename Codec,
  typename Range2>
 void test_encode(Range1&& it, Range2&& expected)
 {
- auto const encoded = Codec::template encode<CodecOutput>(it);
+ auto encoded = Codec::template encode<CodecOutput>(it);
+ check_equal(encoded, expected);
+
+ encoded = Codec::template lazy_encode<CodecOutput>()(it);
  check_equal(encoded, expected);
 }
 
@@ -68,7 +71,10 @@ template <typename Codec,
  typename Range>
 void test_encode(I i, S s, Range&& expected)
 {
- auto const encoded = Codec::template encode<CodecOutput>(i, s);
+ auto encoded = Codec::template encode<CodecOutput>(i, s);
+ check_equal(encoded, expected);
+
+ encoded = Codec::template lazy_encode<CodecOutput>()(i, s);
  check_equal(encoded, expected);
 }
 
@@ -95,7 +101,10 @@ template <typename Codec,
  typename Range2>
 void test_decode(Range1&& it, Range2&& expected)
 {
- auto const decoded = Codec::template decode<CodecOutput>(it);
+ auto decoded = Codec::template decode<CodecOutput>(it);
+ check_equal(decoded, expected);
+
+ decoded = Codec::template lazy_decode<CodecOutput>()(it);
  check_equal(decoded, expected);
 }
 
@@ -106,7 +115,10 @@ template <typename Codec,
  typename Range>
 void test_decode(I i, S s, Range&& expected)
 {
- auto const decoded = Codec::template decode<CodecOutput>(i, s);
+ auto decoded = Codec::template decode<CodecOutput>(i, s);
+ check_equal(decoded, expected);
+
+ decoded = Codec::template lazy_decode<CodecOutput>()(i, s);
  check_equal(decoded, expected);
 }