variant implicit conversion test

clone command

~/prog_dev/boost/releases/ro/boost_1_65_1/sandbox/kojoley $ git clone https://github.com/Kojoley/spirit.git -b x3-variant-fixes x3-variant-fixes
Cloning into 'x3-variant-fixes'...
remote: Counting objects: 110149, done.        
remote: Compressing objects: 100% (147/147), done.        
remote: Total 110149 (delta 137), reused 207 (delta 106), pack-reused 109879        
Receiving objects: 100% (110149/110149), 119.05 MiB | 586.00 KiB/s, done.
Resolving deltas: 100% (84033/84033), done.
Checking connectivity... done.
~/prog_dev/boost/releases/ro/boost_1_65_1/sandbox/kojoley $      

compilation

-*- mode: compilation; default-directory: "~/prog_dev/boost/releases/ro/boost_1_65_1/sandbox/kojoley/test/" -*-
Compilation started at Fri Mar 23 10:58:54

make -k all
***Without implicit conversion:
/home/evansl/dwnlds/llvm/5.0/prebuilt/clang+llvm-5.0.0-linux-x86_64-ubuntu16.04/bin/clang++ -c -O0 -gdwarf-2 -stdlib=libc++  -std=c++17 -ftemplate-backtrace-limit=0 -fdiagnostics-show-template-tree -fno-elide-type -fmacro-backtrace-limit=0     -I../x3-variant-fixes/include -I/home/evansl/prog_dev/boost/releases/ro/boost_1_65_1 -UIMPLICIT_CONVERSION joels_preference.cpp
rm joels_preference.o
***With implicit conversion:
/home/evansl/dwnlds/llvm/5.0/prebuilt/clang+llvm-5.0.0-linux-x86_64-ubuntu16.04/bin/clang++ -c -O0 -gdwarf-2 -stdlib=libc++  -std=c++17 -ftemplate-backtrace-limit=0 -fdiagnostics-show-template-tree -fno-elide-type -fmacro-backtrace-limit=0     -I../x3-variant-fixes/include -I/home/evansl/prog_dev/boost/releases/ro/boost_1_65_1 -DIMPLICIT_CONVERSION joels_preference.cpp

Compilation finished at Fri Mar 23 10:58:57

joels_preference.cpp

#include <boost/spirit/home/x3.hpp>
#include <boost/spirit/home/x3/support/ast/variant.hpp>
#include <string>
#include <iostream>
using my_variant_with_int=boost::spirit::x3::variant<int,std::string>;
void foo(my_variant_with_int const& var)
{
  std::cout<<"var="<<boost::get<int>(var)<<"\n";
}
int main()
{
//#define IMPLICIT_CONVERSION
#ifdef IMPLICIT_CONVERSION
  //This should fail compilation.
  foo(123);
#else
  //This should pass compilation.
  foo(my_variant_with_int(123));
#endif  
  return 0;
}  

Show -I flag OK

-*- mode: compilation; default-directory: "~/prog_dev/boost/releases/ro/boost_1_65_1/sandbox/kojoley/test/" -*-
Compilation started at Fri Mar 23 11:20:46

make -k ls
ls -ld ../x3-variant-fixes/include/*
drwxrwxr-x 3 evansl evansl 4096 Mar 22 19:40 ../x3-variant-fixes/include/boost

Compilation finished at Fri Mar 23 11:20:46