Building with Visual Studio 2019

[lorisleitner]

Is anyone able to use the library with Visual Studio 2019?

• Describe what you want to achieve.
  Use the single include header with a Visual Studio 2019 project. Just including it yields about 1500 errors.

1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1032,51): error C2059:  syntax error: 'is_detected<nlohmann::detail::key_type_t,CompatibleObjectType>::value'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1043,4): error C2976:  'nlohmann::detail::is_compatible_object_type_impl': too few template arguments
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1029): message :  see declaration of 'nlohmann::detail::is_compatible_object_type_impl'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1047,1): error C2955:  'nlohmann::detail::is_compatible_object_type_impl': use of class template requires template argument list
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1029): message :  see declaration of 'nlohmann::detail::is_compatible_object_type_impl'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1047): message :  see reference to class template instantiation 'nlohmann::detail::is_compatible_object_type<BasicJsonType,CompatibleObjectType>' being compiled
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1057,54): error C2059:  syntax error: 'is_detected<nlohmann::detail::key_type_t,CompatibleObjectType>::value'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1075,4): error C2976:  'nlohmann::detail::is_constructible_object_type_impl': too few template arguments
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1054): message :  see declaration of 'nlohmann::detail::is_constructible_object_type_impl'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1080,1): error C2955:  'nlohmann::detail::is_constructible_object_type_impl': use of class template requires template argument list
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1054): message :  see declaration of 'nlohmann::detail::is_constructible_object_type_impl'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1080): message :  see reference to class template instantiation 'nlohmann::detail::is_constructible_object_type<BasicJsonType,ConstructibleObjectType>' being compiled
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1126,50): error C2059:  syntax error: 'is_detected<nlohmann::detail::iterator_t,CompatibleArrayType>::value'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1136,4): error C2976:  'nlohmann::detail::is_compatible_array_type_impl': too few template arguments
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1123): message :  see declaration of 'nlohmann::detail::is_compatible_array_type_impl'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1140,1): error C2955:  'nlohmann::detail::is_compatible_array_type_impl': use of class template requires template argument list
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1123): message :  see declaration of 'nlohmann::detail::is_compatible_array_type_impl'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1140): message :  see reference to class template instantiation 'nlohmann::detail::is_compatible_array_type<BasicJsonType,CompatibleArrayType>' being compiled
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1157,59): error C2059:  syntax error: 'std::is_default_constructible<ConstructibleArrayType>::value'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1179,4): error C2976:  'nlohmann::detail::is_constructible_array_type_impl': too few template arguments
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1153): message :  see declaration of 'nlohmann::detail::is_constructible_array_type_impl'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1183,1): error C2955:  'nlohmann::detail::is_constructible_array_type_impl': use of class template requires template argument list
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1153): message :  see declaration of 'nlohmann::detail::is_constructible_array_type_impl'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1183): message :  see reference to class template instantiation 'nlohmann::detail::is_constructible_array_type<BasicJsonType,ConstructibleArrayType>' being compiled
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1193,51): error C2059:  syntax error: 'std::is_integral<CompatibleNumberIntegerType>::value'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1205,4): error C2976:  'nlohmann::detail::is_compatible_integer_type_impl': too few template arguments
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1190): message :  see declaration of 'nlohmann::detail::is_compatible_integer_type_impl'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1210,1): error C2955:  'nlohmann::detail::is_compatible_integer_type_impl': use of class template requires template argument list
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1190): message :  see declaration of 'nlohmann::detail::is_compatible_integer_type_impl'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(1210): message :  see reference to class template instantiation 'nlohmann::detail::is_compatible_integer_type<RealIntegerType,CompatibleNumberIntegerType>' being compiled
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2630,66): error C2059:  syntax error: 'std::is_integral<std::remove_pointer<_Ty>::type>::value'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2632,9): error C4430:  missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2632,9): warning C4346:  'std::is_pointer<_Ty>::valueand': dependent name is not a type
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2632,9): message :  prefix with 'typename' to indicate a type
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2632): error C2062:  type 'unknown-type' unexpected
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2632,11): error C2039:  'type': is not a member of '`global namespace''
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2634,5): error C2334:  unexpected token(s) preceding ':'; skipping apparent function body
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2710,1): error C2059:  syntax error: '}'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2710,1): error C2143:  syntax error: missing ';' before '}'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2608,7): error C2614:  'nlohmann::detail::input_adapter': illegal member initialization: 'ia' is not a base or member
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2611,7): error C2614:  'nlohmann::detail::input_adapter': illegal member initialization: 'ia' is not a base or member
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2615,7): error C2614:  'nlohmann::detail::input_adapter': illegal member initialization: 'ia' is not a base or member
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2618,7): error C2614:  'nlohmann::detail::input_adapter': illegal member initialization: 'ia' is not a base or member
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2621,7): error C2614:  'nlohmann::detail::input_adapter': illegal member initialization: 'ia' is not a base or member
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2624,7): error C2614:  'nlohmann::detail::input_adapter': illegal member initialization: 'ia' is not a base or member
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2965,19): error C2039:  'exception': is not a member of 'nlohmann::nlohmann::detail'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2843): message :  see declaration of 'nlohmann::nlohmann::detail'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3037): message :  see reference to class template instantiation 'nlohmann::nlohmann::detail::json_sax_dom_parser<BasicJsonType>' being compiled
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2965,1): error C4430:  missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2965,28): error C2143:  syntax error: missing ',' before '&'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2971,15): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2974,7): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2976,7): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2979,7): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2981,7): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2983,7): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3211,19): error C2039:  'exception': is not a member of 'nlohmann::nlohmann::detail'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2843): message :  see declaration of 'nlohmann::nlohmann::detail'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3341): message :  see reference to class template instantiation 'nlohmann::nlohmann::detail::json_sax_dom_callback_parser<BasicJsonType>' being compiled
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3211,1): error C4430:  missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3211,28): error C2143:  syntax error: missing ',' before '&'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3217,15): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3220,7): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3222,7): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3225,7): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3227,7): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3229,7): error C3861:  'ex': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3407,90): error C2039:  'exception': is not a member of 'nlohmann::nlohmann::detail'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(2843): message :  see declaration of 'nlohmann::nlohmann::detail'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3411): message :  see reference to class template instantiation 'nlohmann::nlohmann::detail::json_sax_acceptor<BasicJsonType>' being compiled
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3407,1): error C4430:  missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3407,99): error C2143:  syntax error: missing ',' before '&'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3593,1): error C2061:  syntax error: identifier 'input_adapter_t'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5527): message :  see reference to class template instantiation 'nlohmann::nlohmann::detail::binary_reader<BasicJsonType,SAX>' being compiled
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3613,1): error C4430:  missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3613,40): error C2146:  syntax error: missing ')' before identifier 'format'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3613,1): error C3646:  'format': unknown override specifier
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3614,15): error C2143:  syntax error: missing ';' before '*'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3614,1): error C2377:  'nlohmann::nlohmann::detail::binary_reader<BasicJsonType,SAX>::json_sax_t': redefinition; typedef cannot be overloaded with any other symbol
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3585): message :  see declaration of 'nlohmann::nlohmann::detail::binary_reader<BasicJsonType,SAX>::json_sax_t'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3615,1): error C2059:  syntax error: ')'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3616,1): error C2334:  unexpected token(s) preceding '{'; skipping apparent function body
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5390,1): error C4430:  missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5390,41): error C2146:  syntax error: missing ')' before identifier 'format'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5390,1): error C3646:  'format': unknown override specifier
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5390,1): error C2988:  unrecognizable template declaration/definition
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5390,1): error C2059:  syntax error: ','
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5390,1): error C2059:  syntax error: ')'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5391,1): error C2334:  unexpected token(s) preceding '{'; skipping apparent function body
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5433,1): error C4430:  missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5433,41): error C2146:  syntax error: missing ')' before identifier 'format'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5433,1): error C3646:  'format': unknown override specifier
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5433,1): error C2988:  unrecognizable template declaration/definition
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5433,1): error C2059:  syntax error: ','
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5435,1): error C2059:  syntax error: ')'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5436,1): error C2334:  unexpected token(s) preceding '{'; skipping apparent function body
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5455,1): error C4430:  missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5455,43): error C2146:  syntax error: missing ')' before identifier 'format'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5455,1): error C3646:  'format': unknown override specifier
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5455,57): error C2062:  type 'char' unexpected
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5456,1): error C4430:  missing type specifier - int assumed. Note: C++ does not support default-int
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5456,4): error C2988:  unrecognizable template declaration/definition
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5456,4): error C2059:  syntax error: '{'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5456,1): error C2334:  unexpected token(s) preceding '{'; skipping apparent function body
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5471,1): error C2061:  syntax error: identifier 'cr'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5471,1): error C2059:  syntax error: ')'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5471,89): error C2988:  unrecognizable template declaration/definition
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5471,89): error C2143:  syntax error: missing ')' before ';'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5471,1): error C2838:  'snprintf': illegal qualified name in member declaration
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5472,1): error C2988:  unrecognizable template declaration/definition
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5472,1): error C2059:  syntax error: 'return'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5472,1): error C2334:  unexpected token(s) preceding '{'; skipping apparent function body
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3593,54): error C3861:  'ia': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3593,67): error C3861:  'adapter': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3596,5): error C3861:  'ia': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3688,5): error C3861:  'get_number': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3690,9): error C3861:  'sax': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3700,12): error C3861:  'sax': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3720,10): error C3861:  'current': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3724,33): error C3861:  'current': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3747,13): error C3861:  'sax': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3747,13): message :  This diagnostic occurred in the compiler generated function 'bool nlohmann::nlohmann::detail::binary_reader<BasicJsonType,SAX>::get_bson_string(const NumberType,BasicJsonType::string_t &)'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3747,30): error C3861:  'chars_read': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3747,30): message :  This diagnostic occurred in the compiler generated function 'bool nlohmann::nlohmann::detail::binary_reader<BasicJsonType,SAX>::get_bson_string(const NumberType,BasicJsonType::string_t &)'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3747,79): error C3861:  'chars_read': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3747,79): message :  This diagnostic occurred in the compiler generated function 'bool nlohmann::nlohmann::detail::binary_reader<BasicJsonType,SAX>::get_bson_string(const NumberType,BasicJsonType::string_t &)'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3771,30): error C2760:  syntax error: unexpected token ',', expected 'expression'
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3844,54): error C3861:  'chars_read': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3850,31): error C3861:  'sax': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3874,5): error C3861:  'get_number': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3876,9): error C3861:  'sax': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3886,12): error C3861:  'sax': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3902,32): error C3861:  'current': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3933,13): error C3861:  'sax': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3933,65): error C3861:  'current': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3938,58): error C3861:  'sax': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3944,58): error C3861:  'sax': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(3950,58): error C3861:  'sax': identifier not found
1>C:\Users\loris\source\repos\jsontest\jsontest\json.hpp(5473,1): error C1003:  error count exceeds 100; stopping compilation
1>Done building project "jsontest.vcxproj" -- FAILED.

• Describe what you tried.
  Adding json.hpp to my project

• Describe which system (OS, compiler) you are using.
  Windows 10 Build 17763, VS 16.1.1, Microsoft (R) C/C++ Optimizing Compiler Version 19.21.27702.2 for x86

• Describe which version of the library you are using (release version, develop branch).
  Latest release, version 3.6.1

[nlohmann]

Did you switch on C++11 support? The library compiles fine with Visual Studio 2015 and 2017: https://ci.appveyor.com/project/nlohmann/json

[nickaein]

@Loris156: As nlohmann said this is likely to be caused by compiler mis-configuration. Did you be able to fix it? If not, can you give the exact configuration that lead to this problem? I have VS2019 and try to reproduce it.

P.S. Appveyor has planned to add support for VS2019 and its draft/testing images is already available. Hopefully we can add VS2019 builds to CI soon.

[lorisleitner]

Fixed it, it was a file encoding issue, thank you both for helping me

[DucaRii]

How exactly did you fix this issue? Since I'm having the same problem with VS2019

[Nuclearfossil]

I'm having the same issue - what does "file encoding issue" mean? I've copied/pasted 3.7.0 from the release folder.

edit: To be clear, I've opened up the source file in Git, as raw, then selected all the text and pasted into an open file (json.h).

However, downloading the file and then copying that file (with the hpp extension) works fine.

So ... some weird code page issue in Git?