"incomplete type ‘nlohmann::detail::wide_string_input_helper" compilation error #2969
Comments
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I can reproduce the behavior, though I am not sure what you expect when you pass a vector of |
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I am sure this worked at some point, weird. (Or the tests never ran properly.) I expected to be able to have it simply convert the vector of JSON objects into a native JSON array object. If that was possible, it would be easier to convert the newline-delimited JSON-formatted string into a proper JSON object without having to resort to manually building a complete string. Right now I work around this by creating a Perhaps this is an XY problem, and in reality I need a better way to construct the final JSON object on the go. |
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I think the reason for the behavior is that the parser wants to treat a vector of multi-byte elements as a wide string. This may be weird, but was not changed in the last releases. If you want to combine multiple json foo_vec;
foo_vec.push_back(json::parse("{\"foo\": \"bar\"}"));
foo_vec.push_back(json::parse("{\"baz\": \"baz\"}"));Alternatively, you could do this: std::vector<json> foo_vec;
foo_vec.push_back(json::parse("{\"foo\": \"bar\"}"));
foo_vec.push_back(json::parse("{\"baz\": \"baz\"}"));
json foo_array = foo_vec; |
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That would be much simpler, thank you. |
nlohmann
added
kind: question
solution: proposed fix
What is the issue you have?
I am using this code to parse lines of JSON (basically stemming from a newline-delimited JSON file) into a vector, then parsing that vector into a JSON array.
This used to work fine. For some reason (Compiler update? I honestly have no idea), the following compiler error is now raised when compiling:
The entire log can be found below.
CMake log
-- The C compiler identification is GNU 10.3.0 -- The CXX compiler identification is GNU 10.3.0 -- Check for working C compiler: /usr/bin/cc -- Check for working C compiler: /usr/bin/cc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Detecting C compile features -- Detecting C compile features - done -- Check for working CXX compiler: /usr/bin/c++ -- Check for working CXX compiler: /usr/bin/c++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Detecting CXX compile features -- Detecting CXX compile features - done -- Found Python: /home/werner/.pyenv/shims/python3.8 (found version "3.8.1") found components: Interpreter -- Looking for pthread.h -- Looking for pthread.h - found -- Performing Test CMAKE_HAVE_LIBC_PTHREAD -- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed -- Looking for pthread_create in pthreads -- Looking for pthread_create in pthreads - not found -- Looking for pthread_create in pthread -- Looking for pthread_create in pthread - found -- Found Threads: TRUE -- Configuring done -- Generating done -- Build files have been written to: /build /usr/bin/cmake -S/home/werner/Documents/Projects/aveq/surfmeter/android-packet-capture/androidpacketcapture/libs/capture-utils -B/build --check-build-system CMakeFiles/Makefile.cmake 0 /usr/bin/cmake -E cmake_progress_start /build/CMakeFiles /build/CMakeFiles/progress.marks /usr/bin/make -f CMakeFiles/Makefile2 all make[1]: Entering directory '/build' /usr/bin/make -f src/CMakeFiles/captureutils.dir/build.make src/CMakeFiles/captureutils.dir/depend make[2]: Entering directory '/build' cd /build && /usr/bin/cmake -E cmake_depends "Unix Makefiles" /home/werner/Documents/Projects/aveq/surfmeter/android-packet-capture/androidpacketcapture/libs/capture-utils /src /build /build/src /build/src/CMakeFiles/captureutils.dir/DependInfo.cmake --color= Scanning dependencies of target captureutils make[2]: Leaving directory '/build' /usr/bin/make -f src/CMakeFiles/captureutils.dir/build.make src/CMakeFiles/captureutils.dir/build make[2]: Entering directory '/build' [ 7%] Building CXX object src/CMakeFiles/captureutils.dir/capture_utils.cpp.o cd /build/src && /usr/bin/c++ -I/src/../include -I/usr/local/include/pcapplusplus -std=gnu++17 -o CMakeFiles/captureutils.dir/capture_utils.cpp.o -c /src/capture_utils.cpp [ 15%] Linking CXX static library libcaptureutils.a cd /build/src && /usr/bin/cmake -P CMakeFiles/captureutils.dir/cmake_clean_target.cmake cd /build/src && /usr/bin/cmake -E cmake_link_script CMakeFiles/captureutils.dir/link.txt --verbose=1 /usr/bin/ar qc libcaptureutils.a CMakeFiles/captureutils.dir/capture_utils.cpp.o /usr/bin/ranlib libcaptureutils.a make[2]: Leaving directory '/build' [ 15%] Built target captureutils /usr/bin/make -f _deps/googletest-build/googletest/CMakeFiles/gtest.dir/build.make _deps/googletest-build/googletest/CMakeFiles/gtest.dir/depend make[2]: Entering directory '/build' cd /build && 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-std=gnu++17 -o CMakeFiles/test_captureutils.dir/test_captureutils.cpp.o -c /test/test_captureutils.cpp In file included from /test/test_captureutils.cpp:2: /test/../include/json.hpp: In instantiation of ‘void nlohmann::detail::wide_string_input_adapter::fill_buffer() [with long unsigned int T = 16; BaseInputAdapter = nlohmann::detail::iterator_input_adapter<__gnu_cxx::__normal_iterator*, std::vector, std::allocator > > > >; WideCharType = nlohmann::basic_json<>]’: /test/../include/json.hpp:5609:46: required from ‘std::char_traits::int_type nlohmann::detail::wide_string_input_adapter::get_character() [with BaseInputAdapter = nlohmann::detail::iterator_input_adapter<__gnu_cxx::__normal_iterator*, std::vector, std::allocator > > > >; WideCharType = nlohmann::basic_json<>; std::char_traits::int_type = int]’ /test/../include/json.hpp:7851:39: required from ‘nlohmann::detail::lexer::char_int_type nlohmann::detail::lexer::get() [with BasicJsonType = nlohmann::basic_json<>; InputAdapterType = nlohmann::detail::wide_string_input_adapter*, std::vector, std::allocator > > > >, nlohmann::basic_json<> >; nlohmann::detail::lexer::char_int_type = int]’ /test/../include/json.hpp:7990:13: required from ‘bool nlohmann::detail::lexer::skip_bom() [with BasicJsonType = nlohmann::basic_json<>; InputAdapterType = nlohmann::detail::wide_string_input_adapter*, std::vector, std::allocator > > > >, nlohmann::basic_json<> >]’ /test/../include/json.hpp:8014:48: required from ‘nlohmann::detail::lexer::token_type nlohmann::detail::lexer::scan() [with BasicJsonType = nlohmann::basic_json<>; InputAdapterType = nlohmann::detail::wide_string_input_adapter*, std::vector, std::allocator > > > >, nlohmann::basic_json<> >; nlohmann::detail::lexer::token_type = nlohmann::detail::lexer_base >::token_type]’ /test/../include/json.hpp:11262:41: required from ‘nlohmann::detail::parser::token_type nlohmann::detail::parser::get_token() [with BasicJsonType = nlohmann::basic_json<>; InputAdapterType = nlohmann::detail::wide_string_input_adapter*, std::vector, std::allocator > > > >, nlohmann::basic_json<> >; nlohmann::detail::parser::token_type = nlohmann::detail::lexer_base >::token_type]’ /test/../include/json.hpp:10900:28: required from ‘void nlohmann::detail::parser::parse(bool, BasicJsonType&) [with BasicJsonType = nlohmann::basic_json<>; InputAdapterType = nlohmann::detail::wide_string_input_adapter*, std::vector, std::allocator > > > >, nlohmann::basic_json<> >]’ /test/../include/json.hpp:24253:111: required from ‘static nlohmann::basic_json nlohmann::basic_json::parse(InputType&&, nlohmann::basic_json::parser_callback_t, bool, bool) [with InputType = std::vector, std::allocator > >&; ObjectType = std::map; ArrayType = std::vector; StringType = std::__cxx11::basic_string; BooleanType = bool; NumberIntegerType = long int; NumberUnsignedType = long unsigned int; NumberFloatType = double; AllocatorType = std::allocator; JSONSerializer = nlohmann::adl_serializer; BinaryType = std::vector; nlohmann::basic_json::parser_callback_t = std::function&)>]’ /test/test_captureutils.cpp:11:35: required from here /test/../include/json.hpp:5627:67: error: incomplete type ‘nlohmann::detail::wide_string_input_helper*, std::vector, std::allocator > > > >, 16>’ used in nested name specifier 5627 | wide_string_input_helper::fill_buffer(base_adapter, utf8_bytes, utf8_bytes_index, utf8_bytes_filled); | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ make[2]: *** [test/CMakeFiles/test_captureutils.dir/build.make:79: test/CMakeFiles/test_captureutils.dir/test_captureutils.cpp.o] Error 1 make[2]: Leaving directory '/build' make[1]: *** [CMakeFiles/Makefile2:209: test/CMakeFiles/test_captureutils.dir/all] Error 2 make[1]: Leaving directory '/build' make: *** [Makefile:144: all] Error 2Please describe the steps to reproduce the issue.
See above.
Which compiler and operating system are you using?
Which version of the library did you use?
If you experience a compilation error: can you compile and run the unit tests?
(I am waiting for the test suite to run; I have a slow network and it takes a while to download.)
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