[Boost-users] [Proto] Default-constructing a proto::terminal

Subject: [Boost-users] [Proto] Default-constructing a proto::terminal
From: Roland Bock (rbock_at_[hidden])
Date: 2010-09-16 09:09:02

Hi,

I have a class which has boost::proto::terminal members like this:

    struct _table
    {
       struct id
       {
          id(); // default constructible
          /*...*/
       };
       boost::proto::terminal<id>  id_terminal;
    };

    _table table;

Will table.id_terminal be constructed correctly?

I am asking because in Proto's documentation terminals are always 
instantiated with curly braces, e.g.:

typedef  proto::terminal<int>::type  int_;
int_  i  =  {42},  j  =  {24};

template<int  I>
struct  placeholder
{};

proto::terminal<placeholder<0>  >::type  const  _1  =  {{}};
proto::terminal<placeholder<1>  >::type  const  _2  =  {{}};

Thanks and regards,

Roland