Visual Studio 2015 C2664 error std::pair<

[diegoarranz]

Description

Dear all,

I am new using Visual Studio 2015 c++ and I would want to use json.hpp file for a little project. I am having an issue C2664 compiling a basic example and I will need your support.

Regards,

Reproduction steps

Open a new console project in Visual Studio 2015. Create and include directory "include" i nthe project. Copy the file json.hpp v 3.11.2. Create a quick example to test all is right. I have the error describe.

Expected vs. actual results

i exepect sucesfful compile but not possible.

Minimal code example

#include "stdafx.h"
#include "resource.h"
#include "include\3.11.2\json.hpp"
#include <iostream>
#include <iomanip>

using json = nlohmann::json;

int main()
{
	std::cout << std::setw(4) << json::meta() << std::endl;
}

Error messages

Severity	Code	Description	Project	File	Line	Suppression State
Error	C2664	'std::pair<std::_Tree_iterator<std::_Tree_val<std::_Tree_simple_types<std::pair<const StringType,nlohmann::json_abi_v3_11_2::basic_json<std::map,std::vector,StringType,bool,int64_t,uint64_t,double,std::allocator,nlohmann::json_abi_v3_11_2::adl_serializer,std::vector<uint8_t,std::allocator<_Ty>>>>>>>,bool> std::_Tree<std::_Tmap_traits<_Kty,nlohmann::json_abi_v3_11_2::basic_json<std::map,std::vector,StringType,bool,int64_t,uint64_t,double,std::allocator,nlohmann::json_abi_v3_11_2::adl_serializer,std::vector<_Ty,std::allocator<_Ty>>>,_Pr,_Alloc,false>>::emplace<std::basic_string<char,std::char_traits<char>,std::allocator<char>>,nullptr>(std::basic_string<char,std::char_traits<char>,std::allocator<char>> &&,nullptr &&)': cannot convert argument 2 from 'nullptr' to 'nullptr &&'	jsontest	c:\users\diego\documents\visual studio 2015\projects\jsontest\jsontest\include\3.11.2\json.hpp	21298

Compiler and operating system

Visual Studio C++ 2015

Library version

3.11.2

Validation

• [ ] The bug also occurs if the latest version from the develop branch is used.
• [ ] I can successfully compile and run the unit tests.

[nlohmann]

We use MSVC in our CI without problems. To rule out some issues, can you remove the includes for stdafx.h and resource.h and try again?

[nlohmann]

@diegoarranz Any update?