Building fails using single include file: json.hpp

[octavian-sandru]

I just downloaded json.hpp and placed it directly in my source folder.
I then include it in my .cc file:

#include "json.hpp"
using json = nlohmann::json;

and I define a static method:

static void ParseAndInterpretIncomingData(const uint8_t* data, size_t size) {
  json dataObj = json::parse(data, data + size);
}

But when I build, I get these errors directly coming from line where I include the json.hpp:

<my source folder>/json.hpp: In instantiation of ‘constexpr const bool nlohmann::detail::is_constructible_object_type_impl<nlohmann::basic_json<>, std::map<std::basic_string<char>, nlohmann::basic_json<>, std::less<std::basic_string<char> >, std::allocator<std::pair<const std::basic_string<char>, nlohmann::basic_json<> > > >, void>::value’:

<my source folder>/json.hpp:1407:106:   required by substitution of ‘template<class BasicJsonType, class T> decltype ((nlohmann::detail::from_json(j, val), void())) nlohmann::detail::from_json_fn::operator()(const BasicJsonType&, T&) const [with BasicJsonType = nlohmann::basic_json<>; T = std::map<std::basic_string<char>, nlohmann::basic_json<>, std::less<std::basic_string<char> >, std::allocator<std::pair<const std::basic_string<char>, nlohmann::basic_json<> > > >]’

<my source folder>/json.hpp:11530:70:   required by substitution of ‘template<class BasicJsonType, class ValueType> static decltype ((nlohmann::{anonymous}::from_json(forward<BasicJsonType>(j), val), void())) nlohmann::adl_serializer<T, SFINAE>::from_json(BasicJsonType&&, ValueType&) [with BasicJsonType = BasicJsonType; ValueType = ValueType; <template-parameter-1-1> = std::map<std::basic_string<char>, nlohmann::basic_json<>, std::less<std::basic_string<char> >, std::allocator<std::pair<const std::basic_string<char>, nlohmann::basic_json<> > > >; <template-parameter-1-2> = void] [with BasicJsonType = const nlohmann::basic_json<>&; ValueType = std::map<std::basic_string<char>, nlohmann::basic_json<>, std::less<std::basic_string<char> >, std::allocator<std::pair<const std::basic_string<char>, nlohmann::basic_json<> > > >]’

<my source folder>/json.hpp:435:73:   required by substitution of ‘template<class T, class ... Args> using from_json_function = decltype (T:: from_json((declval<Args>)()...)) [with T = nlohmann::adl_serializer<std::map<std::basic_string<char>, nlohmann::basic_json<>, std::less<std::basic_string<char> >, std::allocator<std::pair<const std::basic_string<char>, nlohmann::basic_json<> > > >, void>; Args = {const nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long int, long long unsigned int, double, std::allocator, nlohmann::adl_serializer>&, std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long int, long long unsigned int, double, std::allocator, nlohmann::adl_serializer>, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long int, long long unsigned int, double, std::allocator, nlohmann::adl_serializer> > > >&}]’

<my source folder>/json.hpp:362:74:   required by substitution of ‘template<class Expected, template<class ...> class Op, class ... Args> using is_detected_exact = std::is_same<Expected, typename nlohmann::detail::detector<nlohmann::detail::nonesuch, void, Op, Args ...>::type> [with Expected = void; Op = nlohmann::detail::from_json_function; Args = {nlohmann::basic_json<>::json_serializer<std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long int, long long unsigned int, double, std::allocator, nlohmann::adl_serializer>, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long int, long long unsigned int, double, std::allocator, nlohmann::adl_serializer> > > >, void>, const nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long int, long long unsigned int, double, std::allocator, nlohmann::adl_serializer>&, std::map<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long int, long long unsigned int, double, std::allocator, nlohmann::adl_serializer>, std::less<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::basic_string<char, std::char_traits<char>, std::allocator<char> >, nlohmann::basic_json<std::map, std::vector, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool, long long int, long long unsigned int, double, std::allocator, nlohmann::adl_serializer> > > >&}]’

<my source folder>/json.hpp:450:27:   required from ‘constexpr const bool nlohmann::detail::has_from_json<nlohmann::basic_json<>, std::map<std::basic_string<char>, nlohmann::basic_json<>, std::less<std::basic_string<char> >, std::allocator<std::pair<const std::basic_string<char>, nlohmann::basic_json<> > > >, void>::value’
<my source folder>/json.hpp:14047:62:   required by substitution of ‘template<class T, class U> using get_template_function = decltype (declval<T>().get<U>()) [with T = const nlohmann::basic_json<>&; U = std::map<std::basic_string<char>, nlohmann::basic_json<>, std::less<std::basic_string<char> >, std::allocator<std::pair<const std::basic_string<char>, nlohmann::basic_json<> > > >]’
<my source folder>/json.hpp:14338:20:   required from here
<my source folder>/json.hpp:557:63: error: suggest parentheses around ‘&&’ within ‘||’ [-Werror=parentheses]
         typename ConstructibleObjectType::mapped_type>::value or

[gregmarr]

/json.hpp:557:63: error: suggest parentheses around ‘&&’ within ‘||’ [-Werror=parentheses]
typename ConstructibleObjectType::mapped_type>::value or

Did you try disabling this error around the include?

[octavian-sandru]

I wish I could do that, if I knew how

[nlohmann]

Can you compile and run the test suite?

[octavian-sandru]

I'm thinking I'm not using the right C++ compiler version. C++11 should do it...

[nlohmann]

So is the issue solved?

[octavian-sandru]

no I gave up. For me it was a temporary thing anyways to parse data incoming data in C++. Will accomplish this in JavaScript

[Rasnar]

Hello!
I have the same problem as stated by octavian-sandru :

json/single_include/nlohmann/json.hpp:1407:106:   required by substitution of 'template<class BasicJsonType, class ConstructibleObjectType, typename std::__1::enable_if<nlohmann::detail::is_constructible_object_type<BasicJsonType, ConstructibleObjectType>::value, int>::type <anonymous> > void nlohmann::detail::from_json(const BasicJsonType&, ConstructibleObjectType&) [with BasicJsonType = nlohmann::basic_json<>; ConstructibleObjectType = std::__1::map<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<>, std::__1::less<void>, std::__1::allocator<std::__1::pair<const std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<> > > >; typename std::__1::enable_if<nlohmann::detail::is_constructible_object_type<BasicJsonType, ConstructibleObjectType>::value, int>::type <anonymous> = <missing>]'

json/single_include/nlohmann/json.hpp:1529:26:   required by substitution of 'template<class BasicJsonType, class T> decltype ((nlohmann::detail::from_json(j, val), void())) nlohmann::detail::from_json_fn::operator()(const BasicJsonType&, T&) const [with BasicJsonType = nlohmann::basic_json<>; T = std::__1::map<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<>, std::__1::less<void>, std::__1::allocator<std::__1::pair<const std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<> > > >]'

json/single_include/nlohmann/json.hpp:11635:34:   required by substitution of 'template<class BasicJsonType, class ValueType> static decltype ((nlohmann::{anonymous}::from_json(forward<BasicJsonType>(j), val), void())) nlohmann::adl_serializer<T, SFINAE>::from_json(BasicJsonType&&, ValueType&) [with BasicJsonType = const nlohmann::basic_json<>&; ValueType = std::__1::map<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<>, std::__1::less<void>, std::__1::allocator<std::__1::pair<const std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<> > > >]'

single_include/nlohmann/json.hpp:1529:26:   required by substitution of 'template<class BasicJsonType, class T> decltype ((nlohmann::detail::from_json(j, val), void())) nlohmann::detail::from_json_fn::operator()(const BasicJsonType&, T&) const [with BasicJsonType = nlohmann::basic_json<>; T = std::__1::map<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<>, std::__1::less<void>, std::__1::allocator<std::__1::pair<const std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<> > > >]'

json/single_include/nlohmann/json.hpp:450:27:   required from 'constexpr const bool nlohmann::detail::has_from_json<nlohmann::basic_json<>, std::__1::map<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<>, std::__1::less<void>, std::__1::allocator<std::__1::pair<const std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<> > > >, void>::value'

json/single_include/nlohmann/json.hpp:438:76:   required by substitution of 'template<class T, class U> using get_template_function = decltype (declval<T>().get<U>()) [with T = const nlohmann::basic_json<>&; U = std::__1::map<std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<>, std::__1::less<void>, std::__1::allocator<std::__1::pair<const std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, nlohmann::basic_json<> > > >]'

But only if I use the version HEAD at f102df3 (no errors if I use the tag v3.3.0).

I'm in a bit of a strange place because I'm cross-compiling with QNX. I compile for two target, the first is my native Linux machine that is used for some unit tests (g++ v6.3) and the second is my QNX target. The Linux compilation do not show the errors stated beforehand.
For my QNX compilation, those are my versions of the compiler :

$ q++ -V
cc: targets available in /home/debian/qnx700/host/linux/x86_64/etc/qcc:
	5.4.0,gcc_ntox86_64_gpp	
	5.4.0,gcc_ntox86_64_cxx	
	5.4.0,gcc_ntoaarch64le	
	5.4.0,gcc_ntoaarch64le_gpp	
	5.4.0,gcc_ntoaarch64le_cxx	
	5.4.0,gcc_ntoarmv7le_gpp	
	5.4.0,gcc_ntox86_gpp	
	5.4.0,gcc_ntoarmv7le	
	5.4.0,gcc_ntox86_cxx	
	5.4.0,gcc_ntox86	(default)
	5.4.0,gcc_ntox86_64	
	5.4.0,gcc_ntoarmv7le_cxx

I will stick with the version 3.3.0 for now.