id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
12621	property_tree::read_json does not work with BOOST_BIND_NO_PLACEHOLDERS	ja2222ja@…	Sebastian Redl	"Minimal code example:
{{{
#define BOOST_BIND_NO_PLACEHOLDERS
#include <boost/property_tree/json_parser.hpp>
#include <functional>
using namespace std::placeholders;

int main () {
    boost::property_tree::ptree pt;
    boost::property_tree::read_json(""lol"", pt);
}
}}}

Visual Studio 2015 Update 3 with v120 toolkit generates:
{{{
\lib\native\include\boost\bind\bind.hpp(319): error C2664: 'void boost::_mfi::mf1<void,boost::property_tree::json_parser::detail::standard_callbacks<Ptree>,char>::operator ()(T *,A1) const' : cannot convert argument 2 from 'std::_Ph<1>' to 'char'
1>          with
1>          [
1>              Ptree=boost::property_tree::ptree
1>  ,            T=boost::property_tree::json_parser::detail::standard_callbacks<boost::property_tree::ptree>
1>  ,            A1=char
1>          ]
1>          No user-defined-conversion operator available that can perform this conversion, or the operator cannot be called
}}}

First affected version: 1.59 [which introduces the new json parser]

My investigation shows that {{{property_tree::json_parser::detail::standard_callbacks::operator()}}} uses unqualified  {{{_1}}} symbol. Since {{{#define BOOST_BIND_NO_PLACEHOLDERS}}} is used, compiler don't know nothing about {{{_1}}}.

Error msg generated in msvc shows that {{{boost::bind}}} is messed up with {{{std::placeholders::_1}}}. The problem might be causes by no two-phase-lookup in {{{cl}}}. {{{using namespace std::placeholders}}} affects mentioned {{{_1}}} usage in {{{operator()}}} since lookup for non dependent {{{_1}}} is done later. Fixing issue in boost should workaround the msvc issue.

Please note that without {{{#define BOOST_BIND_NO_PLACEHOLDERS}}} everything works ok."	Bugs	new	To Be Determined	property_tree	Boost 1.61.0	Regression			kaballo86@…