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Compile error with g++ 4.9.3 cygwin 64-bit #112
Description
I've tried to compile the following code
#include "json.hpp"
#include <iostream>
using json = nlohmann::json;
int main()
{
json j;
j["success"] = false;
std::cout << j.dump(4) << std::endl;
return 0;
}with g++ 4.9.3 on cygwin 64-bit (I'm using Windows 10)
$ g++ --version
g++ (GCC) 4.9.3
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
This is the compiler output
$ g++ main.cpp -std=c++11 -o main
In file included from main.cpp:1:0:
json.hpp: In member function ‘std::string nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberFloatType, AllocatorType>::iterator_wrapper::iterator_wrapper_internal::calculate_key()’:
json.hpp:5725:32: error: ‘to_string’ is not a member of ‘std’
return std::to_string(array_index);
^
json.hpp: In member function ‘long double nlohmann::basic_json<ObjectType, ArrayType, StringType, BooleanType, NumberIntegerType, NumberFloatType, AllocatorType>::lexer::get_number() const’:
json.hpp:6940:36: error: ‘strtold’ is not a member of ‘std’
const auto float_val = std::strtold(reinterpret_cast<typename string_t::const_pointer>(m_start),
^
json.hpp:6940:36: note: suggested alternative:
In file included from /usr/lib/gcc/x86_64-pc-cygwin/4.9.3/include/c++/cstdlib:72:0,
from /usr/lib/gcc/x86_64-pc-cygwin/4.9.3/include/c++/bits/stl_algo.h:59,
from /usr/lib/gcc/x86_64-pc-cygwin/4.9.3/include/c++/algorithm:62,
from json.hpp:41,
from main.cpp:1:
/usr/include/stdlib.h:279:20: note: ‘strtold’
extern long double strtold (const char *__restrict, char **__restrict);
Activity
michalplucinski commentedon Nov 12, 2015
Any status report on this bug?
nlohmann commentedon Dec 7, 2015
This seems to be an issue with cygwin's GCC, and unfortunately even GCC 5.2 does not fix it: http://stackoverflow.com/questions/33500074/cygwin-g-5-2-to-string-is-not-a-member-of-std :-(