ttsuki / nanojson Goto Github PK

Hello, thanks for sharing this project. I'm very interested to use it, but I'm running into issue when compiling 'test.cpp'. I tried using the following options, all result in compile errors:

-std=c++98
-std=c++03
-std=c++11
-std=c++14
-std=gnu++98
-std=gnu++03
-std=gnu+=11
-std=gnu++14

Here's the output from one of my attempts:
$ g++ -std=c++11 test.cpp -o test
In file included from test.cpp:10:0:
nanojson.h:453:14: error: explicit specialization in non-namespace scope ‘class nanojson::element::element_writer’
template <>
^
nanojson.h:454:82: error: template-id ‘snprintf’ in declaration of primary template
static void snprintf(char buffer, size_t bufferCount, char format, ...)
^
nanojson.h:475:12: error: field ‘result’ has incomplete type ‘nanojson::element’
element result;
^
In file included from test.cpp:10:0:
nanojson.h:73:9: note: forward declaration of ‘struct nanojson::element’
struct element
^
In file included from test.cpp:10:0:
nanojson.h: In static member function ‘static nanojson::element::string_t nanojson::element::element_writer::encode_string(const string_t&)’:
nanojson.h:438:71: warning: ISO C++ forbids converting a string constant to ‘char’ [-Wwrite-strings]
snprintf(buf, bufsz, "\u%04X", static_cast(src[i]) & 0xFF);
^
nanojson.h: In instantiation of ‘static nanojson::element nanojson::element::from_iterator(T, T) [with T = __gnu_cxx::__normal_iterator<const char, std::__cxx11::basic_string >]’:
nanojson.h:255:49: required from here
nanojson.h:280:40: error: invalid initialization of non-const reference of type ‘nanojson::element::from_iterator(T, T) [with T = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string >]::reader&’ from an rvalue of type ‘nanojson::element::from_iterator(T, T) [with T = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string >]::reader’
return element_reader::parse(reader(first, last));
^
nanojson.h:468:19: note: initializing argument 1 of ‘static nanojson::element nanojson::element::element_reader::parse(istream&) [with istream = nanojson::element::from_iterator(T, T) [with T = __gnu_cxx::__normal_iterator<const char*, std::__cxx11::basic_string >]::reader]’
static element parse(istream &src)
^
nanojson.h: In instantiation of ‘static nanojson::element nanojson::element::from_iterator(T, T) [with T = const char*]’:
nanojson.h:260:73: required from here
nanojson.h:280:40: error: invalid initialization of non-const reference of type ‘nanojson::element::from_iterator(T, T) [with T = const char*]::reader&’ from an rvalue of type ‘nanojson::element::from_iterator(T, T) [with T = const char*]::reader’
return element_reader::parse(reader(first, last));
^
nanojson.h:468:19: note: initializing argument 1 of ‘static nanojson::element nanojson::element::element_reader::parse(istream&) [with istream = nanojson::element::from_iterator(T, T) [with T = const char*]::reader]’
static element parse(istream &src)

https://en.cppreference.com/w/cpp/compiler_support/17
Compiler support for the Elementary string conversions* feature is currently limited to gcc 11 and MSVC 19.24.
I'm unable to compile nanojson2 with Debian 11's clang and gcc packages.
gcc 11 is not available in Debian 11.

The Debian 11 Hard Freeze was on 2021-03-12, which happens to be in between the release of clang-11 and gcc-11

$ cat /etc/debian_version
11.3

$ g++ --version
g++ (Debian 10.2.1-6) 10.2.1 20210110

$ clang++-11 --version
Debian clang version 11.0.1-2